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Les forêts de pins d’Alep du massif de la Clape (2022)
Les forêts de pins d’Alep du massif de la Clape [Rapport] / Clara Gritti, Auteur ; Sébastien Delhaye, Auteur ; Olivier Argagnon, Auteur . - Porquerolles : Conservatoire botanique national méditerranéen de Porquerolles : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-), 2022 . - 43 p.bibliographieédité par Conservatoire botanique national méditerranéen, Centre d’Écologie Fonctionnelle et Évolutive (CNRS) et Institut national de l’information géographique et forestièreLangues : Français (fre)Descripteur : [Termes IGN] Aude (11)[Termes IGN] classification ascendante hiérarchique[Termes IGN] phytosociologie[Termes IGN] pineraie[Termes IGN] Pinus halepensis[Termes IGN] Quercus ilex[Vedettes matières IGN] Botanique Résumé : (auteur) Les forêts de pins d’Alep (Pinus halepensis Mill.) sont très répandues dans le midi de la France. Pourtant, les connaissances sont encore lacunaires à leur sujet. Dans le site Natura 2000 « Massif de la Clape », sur le littoral audois, les particularités des forêts de pins d’Alep sont étudiées en détails. Une attention particulière est portée à la question de la dynamique de ces forêts, réputées pour être l’un des rares cas de pinèdes climaciques sous nos latitudes. Des relevés phytosociologiques de terrain et des paramètres topographiques et lithologiques sont mis à profit pour approfondir les connaissances sur les caractéristiques floristiques et écologiques de ces forêts. Une classification hiérarchique ascendante met en évidence trois groupes de forêts distincts à l’échelle locale. La même méthode est appliquée à l’échelle de la région méditerranéenne continentale française, pour laquelle six groupes distincts sont identifiés. On peut ainsi replacer les pinèdes du massif de la Clape au sein de leur contexte régional. Finalement, il s’avère que les forêts de la Clape s’inscrivent dans la série de végétation du chêne vert (Quercus ilex L.), comme la plupart des peuplements de la région. Rien ne prouve qu’elles aient atteint un climax. Note de contenu : Introduction Matériel et méthode Résultats Discussion et conclusion Numéro de notice : 14330 Affiliation des auteurs : IGN+Ext (2020- ) Thématique : FORET Nature : Rapport d'étude technique nature-HAL : Rapport DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102917 Radar backscatter contribution to tropical forest disturbance monitoring (2022)
Radar backscatter contribution to tropical forest disturbance monitoring [Thèse/HDR] / Bertrand Ygorra, Auteur ; Jean-Pierre Wigneron, Directeur de thèse ; Serge Riazanoff, Directeur de thèse ; Frédéric Frappart, Directeur de thèse . - Bordeaux : Université de Bordeaux, 2022 . - 253 p. ; 21 x 30 cm.Bibliographie
Thèse en vue de l'obtention du Doctorat de l'Université de BordeauxLangues : Anglais (eng)Descripteur : [Vedettes matières IGN] Télédétection[Termes IGN] couvert forestier[Termes IGN] déboisement[Termes IGN] détection de changement[Termes IGN] forêt tropicale[Termes IGN] image Sentinel-SAR[Termes IGN] nébulosité[Termes IGN] télédétection en hyperfréquence Index. décimale : THESE Thèses et HDR Résumé : (Auteur) Earth Observations are increasingly used to monitor environmental problems. Its interests lie in the ability of sensors aboard satellites to provide information at global, regional and local scales. Optical remote sensing has shown great potential for the monitoring of forest disturbances. Until recently, deforestation monitoring systems were mainly based on remotely sensed optical images. In the intertropical latitudes, such images often face limitations of frequent cloud cover, leading to late detection or misdetections due to the low temporal availability of new images uncontaminated by clouds. In tropical humid forests, regrowth can close canopy gaps between two non-cloud-contaminated optical images used for detection.New SAR (Synthetic Aperture Radar) systems have opened new perspectives for forest disturbance monitoring in tropical humid forests (Sentinel-1, PALSAR-2). These active sensors penetrate the clouds. The availability of Sentinel-1 C-band images at high spatial and temporal resolutions makes it a potential substitute of optical systems for monitoring disturbances in forest covers.This work is articulated around three parts. The first part consists in the development of a new change detection method for monitoring disturbances in forest cover, based on the Cumulative Sum algorithm (CuSum) combined with a bootstrap analysis. The method was applied to time-series of Sentinel-1 Ground-Range Detected (GRD) dual polarization (VV, VH) images obtained in a legal forest concession near Kisangani in the Democratic Republic of the Congo. The results from VV and VH polarization were intersected in VV x VH result map, and a spatial recombination of a high Critical Threshold (Tc) with a low critical threshold was performed. The second part of this work is to develop a multiple-breakpoints version of the CuSum cross-Tc called ReCuSum to further enhance the ability to monitor changes in forest cover. The development was made by applying the CuSum cross-Tc over a time-series in an iterative manner, in the State of Parà, Brazilian Amazon. The third axis of this thesis is to develop a Near-Real-Time (NRT) version of the CuSum cross-Tc and to compare it with the state-of-the-art NRT algorithms (RADD, JJ-FAST GLAD, DETER-B, DETER-R). Note de contenu : Chapter 1. General introduction 1.1. Introduction 1.2. Thesis objectives and outline Chapter 2. Radar remote sensing 2.1. The RADAR technique 2.2. Instrumental parameters 2.3. Scattering mechanisms 2.4. Synthetic Aperture Radar 2.5. Sentinel-1 Chapter 3. Methods for monitoring forest cover change using spaceborne SAR sensors 3.1. Introduction 3.2. Publication 3.3. Contribution and perspectives Chapter 4. Monitoring forest disturbances from Sentinel-1 time-series: a CuSumbased approach 4.1. Introduction 4.2. Publication 4.3. Conference note: IGARSS 2021 4.4. Contribution to this work and perspectives in the PhD course Chapter 5. Multiple breakpoints Evolution of the cross-Tc CuSum: ReCuSum 5.1. Introduction 5.2. Publication 5.3. Conference note: IGARSS 2022 5.4. Contribution to this work and perspective Chapter 6. Development of the CuSum cross-Tc as an NRT algorithm 6.1. Introduction 6.2. Publication 6.3. Contribution and perspectives Chapter 7. Conclusion and perspectives 7.1. Conclusion 7.2. Perspectives Numéro de notice : 26964 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Thèse française Note de thèse : Thèse de Doctorat : Physique de l’environnement : Bordeaux : 2022 Organisme de stage : INRAE nature-HAL : Thèse DOI : sans Date de publication en ligne : 16/02/2023 En ligne : https://theses.hal.science/tel-03991973v1/document Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103001 Evaluation de l’état de conservation des habitats de la région Occitanie (2022)
Evaluation de l’état de conservation des habitats de la région Occitanie : Pour le compte de la DRAAF Occitanie, dans le cadre de son PRFB [Rapport] / Ingrid Bonhême, Auteur . - Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-), 2022 . - 66 p.bibliographieLangues : Français (fre)Descripteur : [Termes IGN] état de conservation[Termes IGN] habitat (nature)[Termes IGN] inventaire forestier national (données France)[Termes IGN] Occitanie (région 2016)[Vedettes matières IGN] Ecologie forestière Résumé : (auteur) [objectif] Cette étude a pour but de calculer l’état de conservation des habitats de la région Occitanie, selon la méthode employée en 2020. Cet état de conservation, est calculé à partir des données relevées par l’inventaire forestier national de l’IGN. Il s’agit de calculer des nouvelles valeurs pour l’indicateur d’état de conservation suite à un premier calcul de 2020. Note de contenu : Méthode Résultats Conclusion Numéro de notice : 39394 Affiliation des auteurs : IGN (2020- ) Thématique : BIODIVERSITE/FORET Nature : Rapport d'étude technique DOI : sans En ligne : https://inventaire-forestier.ign.fr/IMG/pdf/2022_rapport_draaf_occitanie.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102835 - High-resolution canopy height map in the Landes forest (France) based on GEDI, Sentinel-1, and Sentinel-2 data with a deep learning approach [Article/Communication] / Martin Schwartz, Auteur ; Philippe Ciais, Auteur ; Catherine Ottle, Auteur ; Aurélien de Truchis, Auteur ; Cédric Vega, Auteur ; Ibrahim Fayad, Auteur ; Martin Brandt, Auteur ; Rasmus Fensholt, Auteur ; Nicolas Baghdadi, Auteur ; François Morneau, Auteur ; David Morin, Auteur ; Dominique Guyon, Auteur ; Sylvia Dayau, Auteur ; Jean-Pierre Wigneron, Auteur . - Ithaca [New York - Etats-Unis] : ArXiv - Université Cornell, 2022.bibliographieLangues : Anglais (eng)
Descripteur : [Vedettes matières IGN] Applications de télédétection[Termes IGN] apprentissage profond[Termes IGN] forêt[Termes IGN] Global Ecosystem Dynamics Investigation lidar[Termes IGN] hauteur des arbres[Termes IGN] image Sentinel-MSI[Termes IGN] image Sentinel-SAR[Termes IGN] Landes de Gascogne[Termes IGN] Pinophyta Résumé : (auteur) In intensively managed forests in Europe, where forests are divided into stands of small size and may show heterogeneity within stands, a high spatial resolution (10 - 20 meters) is arguably needed to capture the differences in canopy height. In this work, we developed a deep learning model based on multi-stream remote sensing measurements to create a high-resolution canopy height map over the "Landes de Gascogne" forest in France, a large maritime pine plantation of 13,000 km2 with flat terrain and intensive management. This area is characterized by even-aged and mono-specific stands, of a typical length of a few hundred meters, harvested every 35 to 50 years. Our deep learning U-Net model uses multi-band images from Sentinel-1 and Sentinel-2 with composite time averages as input to predict tree height derived from GEDI waveforms. The evaluation is performed with external validation data from forest inventory plots and a stereo 3D reconstruction model based on Skysat imagery available at specific locations. We trained seven different U-net models based on a combination of Sentinel-1 and Sentinel-2 bands to evaluate the importance of each instrument in the dominant height retrieval. The model outputs allow us to generate a 10 m resolution canopy height map of the whole "Landes de Gascogne" forest area for 2020 with a mean absolute error of 2.02 m on the Test dataset. The best predictions were obtained using all available satellite layers from Sentinel-1 and Sentinel-2 but using only one satellite source also provided good predictions. For all validation datasets in coniferous forests, our model showed better metrics than previous canopy height models available in the same region. Numéro de notice : P2022-002 Affiliation des auteurs : LIF+Ext (2020- ) Thématique : FORET Nature : Preprint nature-HAL : Préprint DOI : 10.48550/arXiv.2212.10265 Date de publication en ligne : 20/12/2022 En ligne : https://doi.org/10.48550/arXiv.2212.10265 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102850 La féralité : un concept novateur pour les forêts
La féralité : un concept novateur pour les forêts [Article/Communication] / Annik Schnitzler, Auteur ; Jean-Claude Génot, Auteur . - 2022 . - pp 271 - 279.bibliographieLangues : Français (fre)in Revue forestière française > vol 73 n° 2 - 3 (2021) . - pp 271 - 279Descripteur : [Termes IGN] forêt[Termes IGN] gestion de la vie sauvage[Vedettes matières IGN] Foresterie Résumé : (auteur) De nombreux milieux agricoles ou prairiaux, laissés en libre évolution, évoluent vers des stades plus ou moins boisés en fonction des climats, des sols et des héritages anthropiques. Ces milieux en voie d’ensauvagement peuvent être assimilés à la nature férale. Il en existe beaucoup en France, liés à diverses crises économiques. Les plus anciennes ont entre 100 et 130 ans ; les plus jeunes entre 10 et 20 ans. Ils peuvent atteindre de grandes étendues dans la moitié sud de la France. Nous présentons quelques exemples de nature férale dans diverses parties de la France, dans la zone méditerranéenne, en moyenne montagne, en Bretagne ou le long des fleuves, afin de convaincre de l’intérêt de ces forêts férales pour la conservation des espèces en danger, des gros insectes aux grands mammifères. La nature férale française offre une formidable occasion, très concrète, de reconnaître la valeur intrinsèque de la nature sauvage. Numéro de notice : A2022-725 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.20870/revforfr.2021.5472 Date de publication en ligne : 30/03/2022 En ligne : https://doi.org/10.20870/revforfr.2021.5472 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102995 Libre évolution et naturalité en forêt : définitions et métriques associées
Libre évolution et naturalité en forêt : définitions et métriques associées [Article/Communication] / Frédéric Gosselin, Auteur ; Jean-Claude Génot, Auteur ; Thibault Lachat, Auteur . - 2022 . - pp 115 - 136.bibliographieLangues : Français (fre)in Revue forestière française > vol 73 n° 2 - 3 (2021) . - pp 115 - 136Descripteur : [Termes IGN] forêt[Vedettes matières IGN] Foresterie Résumé : (auteur) Depuis son apparition dans la conservation de la nature, la notion de naturalité est très souvent employée pour les écosystèmes forestiers. La multitude de termes pour caractériser les forêts “naturelles” reflète la complexité de ce concept. Nous proposons dans cet article d’analyser les relations entre libre évolution et naturalité, et de distinguer les deux grands types de naturalité : biologique et anthropique — la naturalité anthropique comprenant la notion de libre évolution ou de spontanéité des processus. Nous proposons ensuite une synthèse des métriques employées dans la littérature scientifique pour mesurer ces deux types de naturalité en forêt. Les métriques liées à la naturalité biologique se focalisent sur les stades âgés et sénescents, celles concernant la naturalité anthropique sont plus centrées sur les prélèvements de bois passés (durée depuis la dernière exploitation, intensité des prélèvements…). Nous discutons enfin de ces notions considérées dans un contexte plus large — pas uniquement forestier ; cela nous amène à aborder les biais relatifs au choix des métriques, le lien entre biodiversité et naturalité, l’état de référence dans un contexte de changement global et la relation entre libre évolution et ré-ensauvagement. Numéro de notice : A2022-771 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.20870/revforfr.2021.5464 En ligne : https://doi.org/10.20870/revforfr.2021.5464 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102996 Caractériser l’environnement compétitif des arbres : dépassons la surface terrière !
Caractériser l’environnement compétitif des arbres : dépassons la surface terrière ! [Article/Communication] / Thomas Cordonnier, Auteur . - 2022 . - pp 643 - 648.bibliographieLangues : Français (fre)in Revue forestière française > vol 73 n° 6 (2021) . - pp 643 - 648Descripteur : [Termes IGN] houppier[Termes IGN] rayonnement lumineux[Termes IGN] surface terrière[Vedettes matières IGN] Inventaire forestier Résumé : (auteur) Dans le domaine forestier, la surface terrière est couramment utilisée pour caractériser la compétition entre les arbres d’un peuplement. Pourtant, les développements théoriques des deux dernières décennies permettent de conclure que cette approche est insuffisante, notamment vis-à-vis de la compétition pour la ressource lumière. La théorie nous indique même que la bonne performance, dans certains cas, de la surface terrière ne serait que fortuite et liée à des conditions bien spécifiques. C’est ce que nous présentons et discutons dans cette courte note. Nous appelons ainsi la communauté forestière française à développer et valoriser davantage les mesures des houppiers afin de mieux rendre compte de la compétition entre arbres au sein des peuplements forestiers. Numéro de notice : A2022-790 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.20870/revforfr.2021.7202 Date de publication en ligne : 27/10/2022 En ligne : https://doi.org/10.20870/revforfr.2021.7202 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102998 Synthèse des résultats de la littérature scientifique sur les peuplements mélangés
Synthèse des résultats de la littérature scientifique sur les peuplements mélangés [Article/Communication] / Jordan Bello, Auteur ; Loïc Nicolas, Auteur ; Thierry Sardin, Auteur . - 2022 . - pp 4 - 17.bibliographieLangues : Français (fre)in Rendez-vous techniques > n° 76 (automne 2022) . - pp 4 - 17Descripteur : [Termes IGN] peuplement mélangé[Vedettes matières IGN] Foresterie Résumé : (éditeur) De l’avis général, les peuplements mélangés ont de nombreux avantages. On les dit plus productifs que les peuplements purs, plus résistants ou plus résilients face aux attaques des ravageurs ou aux événements climatiques sévères, etc. Mais par quels processus et que sait-on vraiment ? Jordan Bello a épluché la littérature scientifique disponible pour en faire la synthèse. Numéro de notice : A2022-943 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103180 - Tree species classification in a typical natural secondary forest using UAV-borne LiDAR and hyperspectral data [Article/Communication] / Ying Quan, Auteur ; Mingze Li, Auteur ; Yuanshuo Hao, Auteur ; et al., Auteur . - 2023 . - n° 2171706.bibliographieLangues : Anglais (eng)in GIScience and remote sensing > vol 60 n° 1 (2023) . - n° 2171706
Descripteur : [Vedettes matières IGN] Applications photogrammétriques[Termes IGN] Chine[Termes IGN] classification par forêts d'arbres décisionnels[Termes IGN] données lidar[Termes IGN] espèce végétale[Termes IGN] extraction de traits caractéristiques[Termes IGN] forêt secondaire[Termes IGN] image captée par drone[Termes IGN] image hyperspectrale[Termes IGN] modèle numérique de surface de la canopée[Termes IGN] semis de points Résumé : (auteur) Recent growth in unmanned aerial vehicle (UAV) technology have promoted the detailed mapping of individual tree species. However, the in-depth mining and comprehending of the significance of features derived from high-resolution UAV data for tree species discrimination remains a difficult task. In this study, a state-of-the-art approach combining UAV-borne light detection and ranging (LiDAR) and hyperspectral was used to classify 11 common tree species in a typical natural secondary forest in Northeast China. First, comprehensive relevant structural and spectral features were extracted. Then, the most valuable feature sets were selected by using a hybrid approach combining correlation-based feature selection with the optimized recursive feature elimination algorithm. The random forest algorithm was used to assess feature importance and perform the classification. Finally, the robustness of features derived from point clouds with different structures and hyperspectral images with different spatial resolutions was tested. Our results showed that the best classification accuracy was obtained by combining LiDAR and hyperspectral data (75.7%) compared to that based on LiDAR (60.0%) and hyperspectral (64.8%) data alone. The mean intensity of single returns and the visible atmospherically resistant index for red-edge band were the most influential LiDAR and hyperspectral derived features, respectively. The selected features were robust in point clouds with a density not lower than 5% (~5 pts/m2) and a resolution not lower than 0.3 m in hyperspectral data. Although canopy surface features were slightly different from original LiDAR features, canopy surface information was also important for tree species classification. This study proved the capabilities of UAV-borne LiDAR and hyperspectral data in natural secondary forest tree species discrimination and the potential for this approach to be transferable to other study areas. Numéro de notice : A2023-194 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.1080/15481603.2023.2171706 Date de publication en ligne : 03/02/2023 En ligne : https://doi.org/10.1080/15481603.2023.2171706 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103075 - UAV DTM acquisition in a forested area – comparison of low-cost photogrammetry (DJI Zenmuse P1) and LiDAR solutions (DJI Zenmuse L1) [Article/Communication] / Martin Štroner, Auteur ; Rudolf Urban, Auteur ; Thomas Křemen, Auteur ; et al., Auteur . - 2023 . - n° 2179942.bibliographieLangues : Anglais (eng)in European journal of remote sensing > vol 56 n° 1 (2023) . - n° 2179942
Descripteur : [Vedettes matières IGN] Applications photogrammétriques[Termes IGN] densité de la végétation[Termes IGN] données lidar[Termes IGN] image captée par drone[Termes IGN] modèle numérique de terrain[Termes IGN] rugosité du sol[Termes IGN] semis de points[Termes IGN] structure-from-motion Résumé : (auteur) In this paper, we evaluated the results in terms of accuracy and coverage of the LiDAR-UAV system DJI Zenmuse L1 and Digital Aerial Photogrammetric system (DAP – UAV) DJI Zenmuse P1 in a forested area under leaf-off conditions on three sites with varying terrain ruggedness/tree type combinations. Detailed reference clouds were obtained using terrestrial scanning by Leica P40. Our results show that branches pose no problem to the accuracy of LiDAR-UAV and DAP-UAV derived terrain clouds. Elevation accuracies for photogrammetric data were even better than for LiDAR data – as low as 0.015 m on all sites. However, the LiDAR system provided better coverage, with almost full coverage at all sites, while the DAP-UAV coverage declined with the increasing density of branches (being worst in the young forest). In the very dense young forest (Site 1), the coverage by photogrammetrically extracted terrain cloud using high calculation quality and no filtering achieved 80.7% coverage, while LiDAR-UAV reached almost 100% coverage. The importance of the use of multiple (or last) returns when using LiDAR-UAV systems was demonstrated by the fact that on the site with the densest vegetation, only 11% of the ground points were represented by first returns. Numéro de notice : A2023-219 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.1080/22797254.2023.2179942 Date de publication en ligne : 01/03/2023 En ligne : https://doi.org/10.1080/22797254.2023.2179942 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103161 Metsätilastollinen vuosikirja 2022 (2023)
Metsätilastollinen vuosikirja 2022 = Finnish statistical yearbook of forestry 2022 [Rapport] / Eeva Vaahtera, Éditeur scientifique . - Natural Resources Institute Finland Luke, 2023 . - 198 p.Langues : Finnois (fin) Anglais (eng)Descripteur : [Termes IGN] Finlande[Termes IGN] forêt[Termes IGN] ressources forestières[Vedettes matières IGN] Foresterie Résumé : (éditeur) The Statistical Yearbook of Forestry compiles key annual statistics on Finland's forests, forestry and forest industry. The book also covers forest biodiversity and conservation. The final chapter presents international forest statistics. The book forms part of Finland's forest statistics system, which, by international standards, is among the best in the world. The most recent statistics in the book mainly cover the year 2021. The Forest Statistics Yearbook has a long tradition. It has been produced in seven different decades, since the late 1960s. The content of the book has been continuously developed to meet the growing demand for up-to-date information. The editor-in-chief is Eeva Vaahtera. The book was prepared by an expert editorial team familiar with forest statistics. The editorial team included Irma Kulju, Tuomas Niinistö, Aarre Peltola, Minna Räty, Tiina Sauvula-Seppälä, Jukka Torvelainen and Esa Uotila. Numéro de notice : 17755 Affiliation des auteurs : non IGN Autre URL associée : http://urn.fi/URN:ISBN:978-952-380-584-2 Thématique : FORET Nature : Rapport statistique DOI : sans En ligne : https://jukuri.luke.fi/bitstream/handle/10024/553167/Metsatilastollinen_vuosikir [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103170 Forest Inventory and Analysis Fiscal Year 2021 : Business Report (2023)
Forest Inventory and Analysis Fiscal Year 2021 : Business Report [Rapport] / Mila Alvarez, Auteur ; United States forest service, Auteur . - Radnor [Etats-Unis] : United States Department of Agriculture, Forest Service, 2023 . - 92 p.FS-1212Langues : Anglais (eng)Descripteur : [Termes IGN] Etats-Unis[Termes IGN] inventaire forestier étranger (données)[Vedettes matières IGN] Inventaire forestier Numéro de notice : 17754 Affiliation des auteurs : non IGN Thématique : FORET Nature : Rapport DOI : sans En ligne : https://www.fs.usda.gov/sites/default/files/fs_media/fs_document/FIA-2021-Busine [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103176 - Species-specific deadwood density, its controlling factors and its role in the estimation of deadwood C stock of a Virgin European Beech-Silver Fir Mixed Forest in the Southern Carpathians [Article/Communication] / Ion Catalin Petritan, Auteur . - 2023.bibliographieLangues : Anglais (eng)in SSRN [preprint electronic journal] > vol 2023 [01/02/2023]
Descripteur : [Termes IGN] Abies alba[Termes IGN] bois mort[Termes IGN] Carpates[Termes IGN] décomposition[Termes IGN] densité du bois[Termes IGN] estimation statistique[Termes IGN] Fagus sylvatica[Termes IGN] peuplement mélangé[Termes IGN] puits de carbone[Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Deadwood is a fundamental structural and functional component of forests, with a crucial role in supporting the forest biodiversity and nutrient and carbon cycling. Precise deadwood density estimates are necessary to evaluate the biomass and carbon stocked in this component. For a better understanding of the deadwood dynamics in natural forests, given its higher abundance, it is important to achieve deeper knowledge about its decay rate and how it is influenced by environmental factors. In this study, we estimated dry deadwood density for two different tree species, silver fir (Abies alba) and European beech (Fagus sylvatica) and for three snags and five logs decomposition classes (class 1 representing snag/log deadwood at early stages of decomposition and class 3/5 representing snags or logs, respectively, at its most advanced state of decomposition) in a virgin mixed beech-fir forest in the Southern Carpathians. The goal of this study was to assess how deadwood density is influenced by different abiotic (moisture, elevation, slope, aspect) and wood-related factors (rottenness, position of the sampling along the deadwood piece, the contact with the soil).For snags, the mean dry density showed a reduced variability within decomposition classes (484-326 kg.m-3 for beech and 374-319 kg.m-3 for fir), compared to the logs (486-139 kg.m-3 for beech and 359-161 kg.m-3 for fir). While the mass moisture varied slowly in the first three decay classes (around 60-80%), it increased sharply in the last two decay classes of logs (> 140% in the fourth classes and > 350% in the last one). The rottenness increased with the decay degree in a similar way for both species. The contact of logs with the soil influenced positively the moisture of the log, but the position of the sampling along the piece did not play any significant role in the variability of density. The density estimates per decay classes were used to compare the amount of carbon (C) sequestered as deadwood for each species. The mean biomass of C as deadwood at Sinca virgin forest varied greatly among the 21 plots from 0.36 to 41.16 MgC ha-1, with a mean value of 15.96 ± 2.36 (±SE) MgC ha-1.Our study suggests that volume-based calculations might yield biased quantitative estimates of C stored as deadwood unless a local estimate of dead wood density corrected per species and decomposition class is applied. Moreover, using an averaged value of dry density instead of dry density value for each decay class may result in an overestimation of 22% on the estimation of C stock sequestered as deadwood. Thus, our study may also help planning future inventories of C stocks in other virgin forests and for other species, (e.g., make emphasis in estimating densities in all decay classes). Furthermore, it could serve as a methodological basis for more specific research designed to uncover the potential influence of different forest management practices on dry deadwood density. Numéro de notice : A2023-085 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.2139/ssrn.4350235 En ligne : https://dx.doi.org/10.2139/ssrn.4350235 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102857 Forest structure and fine root biomass influence soil CO2 efflux in temperate forests under drought
Forest structure and fine root biomass influence soil CO2 efflux in temperate forests under drought [Article/Communication] / Antonios Apostolakis, Auteur ; Ingo Schöning, Auteur ; Beate Michalzik, Auteur ; et al., Auteur . - 2023 . - n° 411.Langues : Anglais (eng)in Forests > vol 14 n° 2 (February 2023) . - n° 411Descripteur : [Termes IGN] Allemagne[Termes IGN] biomasse forestière[Termes IGN] forêt tempérée[Termes IGN] puits de carbone[Termes IGN] qualité du sol[Termes IGN] sécheresse[Termes IGN] structure d'un peuplement forestier[Termes IGN] température au sol[Termes IGN] teneur en carbone[Termes IGN] teneur en eau de la végétation[Vedettes matières IGN] Végétation et changement climatique Numéro de notice : A2023-165 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.3390/f14020411 Date de publication en ligne : 17/12/2023 En ligne : https://doi.org/10.3390/f14020411 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102871 Resilience of Pyrenean forests after recurrent historical deforestations
Resilience of Pyrenean forests after recurrent historical deforestations [Article/Communication] / Valenti Rull, Auteur ; Teresa Vegas-Vilarrúbia, Auteur . - 2023 . - n° 567.bibliographieLangues : Anglais (eng)in Forests > vol 14 n° 3 (March 2023) . - n° 567Descripteur : [Termes IGN] déboisement[Termes IGN] forêt méditerranéenne[Termes IGN] histoire[Termes IGN] historique des données[Termes IGN] régénération (sylviculture)[Termes IGN] résilience écologique[Vedettes matières IGN] Ecologie forestière Résumé : (auteur) The long-term resilience of Pyrenean forests in the face of historical anthropogenic clearing remains largely unknown. In this paper, a high-resolution (decadal to subdecadal) paleoecological study of mid-elevation Pyrenean forests is presented that encompasses the last two millennia. This long-term record was obtained after sediment coring, dating (varve counting) and pollen analysis of annually laminated (varved) sediments from Lake Montcortès, situated at 1027 m elevation, in the transition between the Mediterranean and montane forest belts. This allowed the definition of three major deforestation/recovery cycles during the Roman, Medieval and Modern times. Each DR cycle is characterized considering three different levels: overall forest trends, forest type and individual taxa. Overall, the studied forests exhibited high resilience, as they recovered almost completely after each deforestation event (bulk resilience). The critical point of no return (tipping point) beyond which forests would have irreversibly disappeared from the region was never reached, even after deforestation magnitudes above 60%. The different forest types identified (conifer, sclerophyll and deciduous) persisted over time, showing similar heterogeneous patterns with minor spatial reorganizations (mosaic resilience). Individually, the main forest taxa underwent minor variations in their relative abundances, always within the same attraction domains (community resilience). The high levels of resilience documented in these Pyrenean forests are attributed to the action of metapopulation and metacommunity processes and mechanisms in a highly dynamic patchy environment. Conservation actions should be focused on the maintenance of these spatial patterns and the associated ecological dynamics. Numéro de notice : A2023-166 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.3390/f14030567 Date de publication en ligne : 13/03/2023 En ligne : https://doi.org/10.3390/f14030567 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102903 - Species distribution modelling under climate change scenarios for maritime pine (Pinus pinaster Aiton) in Portugal [Article/Communication] / Cristina Alegria, Auteur ; Alice M. Almeida, Auteur ; Natalia Roque, Auteur ; et al., Auteur . - 2023 . - n° 591.bibliographieLangues : Anglais (eng)in Forests > vol 14 n° 3 (March 2023) . - n° 591
Descripteur : [Termes IGN] changement climatique[Termes IGN] classification par forêts d'arbres décisionnels[Termes IGN] distribution spatiale[Termes IGN] entropie maximale[Termes IGN] gestion forestière[Termes IGN] modèle de simulation[Termes IGN] modélisation de la forêt[Termes IGN] Pinus pinaster[Termes IGN] Portugal[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) To date, a variety of species potential distribution mapping approaches have been used, and the agreement in maps produced with different methodological approaches should be assessed. The aims of this study were: (1) to model Maritime pine potential distributions for the present and for the future under two climate change scenarios using the machine learning Maximum Entropy algorithm (MaxEnt); (2) to update the species ecological envelope maps using the same environmental data set and climate change scenarios; and (3) to perform an agreement analysis for the species distribution maps produced with both methodological approaches. The species distribution maps produced by each of the methodological approaches under study were reclassified into presence–absence binary maps of species to perform the agreement analysis. The results showed that the MaxEnt-predicted map for the present matched well the species’ current distribution, but the species ecological envelope map, also for the present, was closer to the species’ empiric potential distribution. Climate change impacts on the species’ future distributions maps using the MaxEnt were moderate, but areas were relocated. The 47.3% suitability area (regular-medium-high), in the present, increased in future climate change scenarios to 48.7%–48.3%. Conversely, the impacts in species ecological envelopes maps were higher and with greater future losses than the latter. The 76.5% suitability area (regular-favourable-optimum), in the present, decreased in future climate change scenarios to 58.2%–51.6%. The two approaches combination resulted in a 44% concordance for the species occupancy in the present, decreasing around 30%–35% in the future under the climate change scenarios. Both methodologies proved to be complementary to set species’ best suitability areas, which are key as support decision tools for planning afforestation and forest management to attain fire-resilient landscapes, enhanced forest ecosystems biodiversity, functionality and productivity. Numéro de notice : A2023-167 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.3390/f14030591 Date de publication en ligne : 16/03/2023 En ligne : https://doi.org/10.3390/f14030591 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102904 Forests attenuate temperature and air pollution discomfort in montane tourist areas
Forests attenuate temperature and air pollution discomfort in montane tourist areas [Article/Communication] / Elena Gottardini, Auteur ; Fabiana Cristofolini, Auteur ; et al., Auteur . - 2023 . - n° 545.bibliographieLangues : Anglais (eng)in Forests > vol 14 n° 3 (March 2023) . - n° 545Descripteur : [Termes IGN] bien-être collectif[Termes IGN] forêt alpestre[Termes IGN] Italie[Termes IGN] pollution atmosphérique[Termes IGN] qualité de l'air[Termes IGN] service écosystémique[Termes IGN] température de l'air[Termes IGN] tourisme[Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Forests deliver many ecosystem services, from provisioning to regulating and cultural services. We aimed at demonstrating microclimatic regulation and pollutant removal as especially relevant ecosystem services when considering the tourism vocation of the Alpine regions. A study was realized along an altitudinal gradient (900–1600 m a.s.l.) in Trentino, northern Italy, an area with high touristic presence (ca. 9.3 million overnight stays in summer 2021). Nitrogen dioxide (NO2, µg m−3), ozone (O3, µg m−3) concentrations, air temperature (T, °C), and relative humidity (RH, %) were simultaneously measured in three open-field sites (OF) and below-canopy Norway spruce forest stands (FO) during the period 23 May–7 August 2013. The temperature–humidity index (THI) was calculated. We found a distinct mitigating effect of forest on T, with lower maximum (−30.6%) and higher minimum values (+6.3%) in FO than in OF. THI supported a higher comfort sensation in FO than in OF, especially in the central part of the day. NO2 concentrations did not differ between OF and FO; ozone concentrations were lower in FO than OF. This study confirms the role of forests in providing several ecosystem services beneficial for forest users, especially relevant for promoting nature-based tourism in the Alpine region. Numéro de notice : A2023-168 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.3390/f14030545 Date de publication en ligne : 10/03/2023 En ligne : https://doi.org/10.3390/f14030545 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102905 - Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density [Article/Communication] / Grégoire Vincent, Auteur ; Philippe Verley, Auteur ; Benjamin Brede, Auteur ; et al., Auteur . - 2023 . - n° 113442.bibliographieLangues : Anglais (eng)in Remote sensing of environment > vol 286 (March 2023) . - n° 113442
Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)[Termes IGN] canopée[Termes IGN] densité de la végétation[Termes IGN] données lidar[Termes IGN] forêt tropicale[Termes IGN] Guyane (département français)[Termes IGN] image captée par drone[Termes IGN] plan de vol[Termes IGN] rayonnement lumineux[Termes IGN] réflectance végétale[Termes IGN] semis de points[Termes IGN] zone d'intérêt Résumé : (auteur) Leaf area is a key structural characteristic of forest canopies because of the role of leaves in controlling many biological and physical processes occurring at the biosphere-atmosphere transition. High pulse density Airborne Laser Scanning (ALS) holds promise to provide spatially resolved and accurate estimates of plant area density (PAD) in forested landscapes, a key step in understanding forest functioning: phenology, carbon uptake, transpiration, radiative balance etc. Inconsistencies between different ALS sensors is a barrier to generating globally harmonised PAD estimates. The basic assumption on which PAD estimation is based is that light attenuation is proportional to vegetation area density. This study shows that the recorded extinction strongly depends on target detectability which is influenced by laser characteristics (power, sensitivity, wavelength). Three different airborne laser scanners were flown over a wet tropical forest at the Paracou research station in French Guiana. Different sensors, flight heights and transmitted power levels were compared. Light attenuation was retrieved with an open source ray-tracing code (http://amapvox.org). Direct comparison revealed marked differences (up-to 25% difference in profile-averaged light attenuation rate and 50% difference at particular heights) that could only be explained by differences in scanner characteristics. We show how bias which may occur under various acquisition conditions can generally be mitigated by a sensor intercalibration. Alignment of light weight lidar attenuation profiles to ALS reference attenuation profiles is not always satisfactory and we discuss what are the likely sources of discrepancies. Neglecting the dependency of apparent light attenuation on scanner properties may lead to biases in estimated vegetation density commensurate to those affecting light attenuation estimates. Applying intercalibration procedures supports estimation of plant area density independent of acquisition characteristics. Numéro de notice : A2023-169 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.1016/j.rse.2022.113442 Date de publication en ligne : 06/01/2023 En ligne : https://doi.org/10.1016/j.rse.2022.113442 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102928 - Une sylviculture dynamique des chênaies sessiliflores favorise la résilience des arbres après une forte sécheresse [Article/Communication] / Anna Schmitt, Auteur ; Raphaël Trouvé, Auteur ; Sandrine Perret, Auteur ; Aurore Calas, Auteur ; Ingrid Seynave, Auteur ; François Lebourgeois, Auteur . - 2023 . - pp 29 - 44.bibliographieLangues : Français (fre)in Revue forestière française > vol 74 n° 1 (2023) . - pp 29 - 44
Descripteur : [Termes IGN] chênaie[Termes IGN] densité du peuplement[Termes IGN] Quercus sessiliflora[Termes IGN] stress hydrique[Termes IGN] sylviculture[Vedettes matières IGN] Foresterie Résumé : (auteur) Les effets de la densité du peuplement, du statut social et des conditions locales de bilan hydrique estival ont été analysés sur la résistance (Rt), la récupération (Rc) et la résilience (Rs) à la sécheresse de 2003. La croissance radiale a été étudiée sur 269 jeunes chênes sessiles échantillonnés dans le réseau d’expérimentations sylvicoles du GIS Coop. Il apparaît une interaction forte entre les conditions locales de bilan hydrique et la densité : diminuer la densité augmente la résistance, la récupération et la résilience des arbres particulièrement sur les sites secs. Cet effet est indépendant du statut social. Messages clés : • Les peuplements en situation hydrique favorable ont été les plus exposés à la sécheresse de 2003. • Diminuer la densité a augmenté la résistance, la récupération et la résilience des chênes sessiles. • L’effet a été particulièrement fort dans les conditions stationnelles les plus sèches. Numéro de notice : A2023-088 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.20870/revforfr.2023.7411 Date de publication en ligne : 13/03/2023 En ligne : https://doi.org/10.20870/revforfr.2023.7411 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103000 - Point cloud data processing optimization in spectral and spatial dimensions based on multispectral Lidar for urban single-wood extraction [Article/Communication] / Shuo Shi, Auteur ; Xingtao Tang, Auteur ; Bowen Chen, Auteur ; et al., Auteur . - 2023 . - n° 90.bibliographieLangues : Anglais (eng)in ISPRS International journal of geo-information > vol 12 n° 3 (March 2023) . - n° 90
Descripteur : [Vedettes matières IGN] Lasergrammétrie[Termes IGN] analyse spectrale[Termes IGN] arbre urbain[Termes IGN] détection d'objet[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] Houston (Texas)[Termes IGN] interpolation[Termes IGN] réflectance spectrale[Termes IGN] segmentation[Termes IGN] semis de points Résumé : (auteur) Lidar can effectively obtain three-dimensional information on ground objects. In recent years, lidar has developed rapidly from single-wavelength to multispectral hyperspectral imaging. The multispectral airborne lidar Optech Titan is the first commercial system that can collect point cloud data on 1550, 1064, and 532 nm channels. This study proposes a method of point cloud segmentation in the preprocessed intensity interpolation process to solve the problem of inaccurate intensity at the boundary during point cloud interpolation. The entire experiment consists of three steps. First, a multispectral lidar point cloud is obtained using point cloud segmentation and intensity interpolation; the spatial dimension advantage of the multispectral point cloud is used to improve the accuracy of spectral information interpolation. Second, point clouds are divided into eight categories by constructing geometric information, spectral reflectance information, and spectral characteristics. Accuracy evaluation and contribution analysis are also conducted through point cloud truth value and classification results. Lastly, the spatial dimension information is enhanced by point cloud drop sampling, the method is used to solve the error caused by airborne scanning and single-tree extraction of urban trees. Classification results showed that point cloud segmentation before intensity interpolation can effectively improve the interpolation and classification accuracies. The total classification accuracy of the data is improved by 3.7%. Compared with the extraction result (377) of single wood without subsampling treatment, the result of the urban tree extraction proved the effectiveness of the proposed method with a subsampling algorithm in improving the accuracy. Accordingly, the problem of over-segmentation is solved, and the final single-wood extraction result (329) is markedly consistent with the real situation of the region. Numéro de notice : A2023-159 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi12030090 Date de publication en ligne : 23/02/2023 En ligne : https://doi.org/10.3390/ijgi12030090 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102852 - Resource-based growth models reveal opportunities to mitigate climate change effects on beech regeneration by silvicultural measures [Article/Communication] / Jan F. Wilkens, Auteur ; Robert Schlicht, Auteur ; Sven Wagner, Auteur . - 2023 . - n° 120815.bibliographieLangues : Anglais (eng)in Forest ecology and management > vol 532 (March-15 2023) . - n° 120815
Descripteur : [Termes IGN] Europe (géographie politique)[Termes IGN] Fagus sylvatica[Termes IGN] gestion forestière[Termes IGN] modèle de croissance végétale[Termes IGN] rayonnement solaire[Termes IGN] régénération (sylviculture)[Termes IGN] semis (sylviculture)[Termes IGN] sylviculture[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Successful European beech (Fagus sylvatica L.) regeneration is both of great ecological and economical importance in European forest ecosystems and severely threatened by climate change impacts. To increase our knowledge of beech regeneration dynamics under climate change and the potential for controlling it through forest management, we studied interactive effects of solar radiation (PHAR), water and nutrient availability on the height growth of artificially (AR) and naturally regenerated (NR) beech seedlings. The study was conducted in the framework of experimental canopy gaps, under the influence of the 2018/19 drought and heatwaves. We measured PHAR by means of hemispherical photography, approximated water availability based on the inverse of modeled fine root density distributions of overstorey beech (BGRB) and oak (BGRO) and approximated nutrient availability based on soil fertility (SF), derived from forest site mapping. Results indicate that seedling resource availability and resulting growth responses increase with canopy gap size and vary among locations within the gap. Multiplicative non-linear mixed models suggest that AR and NR relative height growth (RI) was best explained by interactive effects of PHAR, BGRB, BGRO and SF, which reflect complementary resource use patterns of beech seedlings. At optimal resource availability, AR reached a potential RI of 174%, which is about 20% higher compared to NR. While the low light growth responses of AR and NR both reflect saturation at 5 to 15% PHAR, depending on individual size and the availability of the remaining resources, NR showed a higher RI than AR at intermediate and high PHAR levels in cases of limited BGR and SF. In contrast to AR, NR growth was affected to a lesser extent by SF and BGRB and not significantly affected by BGRO. These results suggest that overstorey oaks have a lower effect on water availability of beech seedlings than overstorey beeches. Additionally, NR showed higher tolerance to water and nutrient limitation than AR, probably due to better root system development. In conclusion, site-specific potential for mitigating the effects of climate change on beech regeneration through forest management lies in the adaptation of silvicultural systems, i.e., the creation of canopy gaps larger than 200 m2, thus significantly exceeding the average gap size of the natural disturbance regime, and the choice of the regeneration method. Numéro de notice : A2023-164 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.foreco.2023.120815 Date de publication en ligne : 26/01/2023 En ligne : https://doi.org/10.1016/j.foreco.2023.120815 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102869 La cartographie du relief : Une gageure technique et des solutions
La cartographie du relief : Une gageure technique et des solutions [Article/Communication] / Laurent Polidori, Auteur . - 2023 . - pp 38 - 48.Langues : Français (fre)in Géomètre > n° 2212 (avril 2023) . - pp 38 - 48Descripteur : [Vedettes matières IGN] Applications photogrammétriques[Termes IGN] canopée[Termes IGN] crue[Termes IGN] données lidar[Termes IGN] données localisées 3D[Termes IGN] inondation[Termes IGN] modèle numérique de terrain[Termes IGN] nuage[Termes IGN] photogrammétrie aérienne[Termes IGN] photogrammétrie terrestre[Termes IGN] précision des données[Termes IGN] qualité du modèle[Termes IGN] représentation du relief[Termes IGN] semis de points[Termes IGN] télémétrie laser Résumé : (Editeur) La reconstruction d’éléments tridimensionnels a fait l’objet de nombreux développements, avec des applications dans des domaines aussi variés que l’architecture, la géologie et l’anatomie, mais c’est au relief terrestre que l’on s’intéresse dans ce dossier. Ainsi, une grande variété de techniques de mesure (photogrammétrie, radar, lidar), mises en œuvre depuis des satellites, des avions, des drones ou à même le sol, adaptées aux différentes échelles et aux différents paysages, permettent de cartographier le relief terrestre sous la forme de nuages de points. Ceux-ci servent à construire des modèles numériques de terrain (sol) ou de surface (canopée forestière, toits), utilisés dans de nombreux domaines, pourvus qu’ils respectent des exigences de qualité comme la précision des altitudes ou la cohérence de l’hydrographie. L’évolution des instruments d’observation et des algorithmes de traitement étend les possibilités de production de modèles de relief et leur usage pour la gestion des territoires. Dans ce contexte, la formation technique constitue le nouvel enjeu pour améliorer le dialogue entre les producteurs et les consommateurs. Numéro de notice : A2023-174 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE Nature : Article nature-HAL : ArtSansCL DOI : sans Date de publication en ligne : 01/04/2023 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102977 - Regeneration in European beech forests after drought: the effects of microclimate, deadwood and browsing [Article/Communication] / Dominik Thom, Auteur ; Christian Ammer, Auteur ; Peter Annighöfer, Auteur ; et al., Auteur . - 2023 . - pp 259 - 27.bibliographieLangues : Anglais (eng)in European Journal of Forest Research > vol 142 n° 2 (April 2023) . - pp 259 - 27
Descripteur : [Termes IGN] Allemagne[Termes IGN] bois mort[Termes IGN] Fagus sylvatica[Termes IGN] rayonnement lumineux[Termes IGN] régénération (sylviculture)[Termes IGN] sécheresse[Termes IGN] sous-étage[Termes IGN] température de l'air[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) With progressing climate change, increasing weather extremes will endanger tree regeneration. Canopy openings provide light for tree establishment, but also reduce the microclimatic buffering effect of forests. Thus, disturbances can have both positive and negative impacts on tree regeneration. In 2015, three years before an extreme drought episode hit Central Europe, we established a manipulation experiment with a factorial block design in European beech (Fagus sylvatica L.)-dominated forests. At five sites located in southeastern Germany, we conducted three censuses of tree regeneration after implementing two different canopy disturbances (aggregated and distributed canopy openings), and four deadwood treatments (retaining downed, standing, downed + standing deadwood and removing all deadwood), as well as in one untreated control plot. In addition, we measured understory light levels and recorded local air temperature and humidity over five years. We (i) tested the effects of experimental disturbance and deadwood treatments on regeneration and (ii) identified the drivers of regeneration density as well as seedling species and structural diversity. Regeneration density increased over time. Aggregated canopy openings supported species and structural diversity, but reduced regeneration density. Tree regeneration was positively associated with understory light levels, while maximum vapor pressure deficit influenced tree regeneration negatively. Deadwood and browsing impacts on regeneration varied and were inconclusive. Our study indicates that despite the drought episode regeneration in beech-dominated forests persisted under moderately disturbed canopies. However, the positive effect of increased light availability on tree regeneration might have been offset by harsher microclimate after canopies have been disturbed. Numéro de notice : A2023-197 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s10342-022-01520-1 Date de publication en ligne : 24/11/2022 En ligne : https://doi.org/10.1007/s10342-022-01520-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103084 - Pyrenean silver fir forests retain legacies of past disturbances and climate change in their growth, structure and composition [Article/Communication] / Antonio Gazol, Auteur ; Ester González-de-Andrés, Auteur ; Michele Colangelo, Auteur ; et al., Auteur . - 2023 . - n° 713.bibliographieLangues : Anglais (eng)in Forests > vol 14 n° 4 (April 2023) . - n° 713
Descripteur : [Termes IGN] Abies alba[Termes IGN] croissance des arbres[Termes IGN] dendrochronologie[Termes IGN] dépérissement[Termes IGN] échantillonnage[Termes IGN] Espagne[Termes IGN] historique[Termes IGN] Pyrénées (montagne)[Termes IGN] sécheresse[Termes IGN] sous-étage[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Recent drought-induced dieback alters forest dynamics, which are also shaped by past management. In western Pyrenean silver fir (Abies alba) stands, dieback concurs in space and time with the legacies of past management, but the impacts on forest growth, structure and composition are unknown. We aim to disentangle how dieback interacts with the legacies of past human use and modulates the recent dynamics of silver fir forests. To this end, we sampled eleven silver fir forests across wide climatic gradients and included declining and non-declining sites. We measured radial growth, structure, composition, understory cover and type and amount of deadwood. Silver fir growth declines in response to late-summer drought. In declining sites, most defoliated stands showed the lowest silver fir density and were those where growth depended more on water availability. Tree death enhanced the cover of dominant understory plants such as Buxus sempervirens. Past management activities leave an imprint in the growth of silver fir, such as releases due to past logging, but also affect the number of stumps and snags and the current tree density. A more extensive monitoring will be required to fully disentangle the multiple influences of past management legacies and current climate change on forest dynamics. Numéro de notice : A2023-202 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.3390/f14040713 Date de publication en ligne : 30/03/2023 En ligne : https://doi.org/10.3390/f14040713 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103104 - Keeping thinning-derived deadwood logs on forest floor improves soil organic carbon, microbial biomass, and enzyme activity in a temperate spruce forest [Article/Communication] / Meisam Nazari, Auteur ; Johanna Pausch, Auteur ; Samuel Bickel, Auteur ; et al., Auteur . - 2023 . - pp 287 - 300.bibliographieLangues : Anglais (eng)in European Journal of Forest Research > vol 142 n° 2 (April 2023) . - pp 287 - 300
Descripteur : [Termes IGN] Bavière (Allemagne)[Termes IGN] biomasse forestière[Termes IGN] bois mort[Termes IGN] éclaircie (sylviculture)[Termes IGN] gestion forestière durable[Termes IGN] grume[Termes IGN] podzosol[Termes IGN] puits de carbone[Termes IGN] sol forestier[Vedettes matières IGN] Sylviculture Résumé : (auteur) Deadwood is a key component of forest ecosystems, but there is limited information on how it influences forest soils. Moreover, studies on the effect of thinning-derived deadwood logs on forest soil properties are lacking. This study aimed to investigate the impact of thinning-derived deadwood logs on the soil chemical and microbial properties of a managed spruce forest on a loamy sand Podzol in Bavaria, Germany, after about 15 years. Deadwood increased the soil organic carbon contents by 59% and 56% at 0–4 cm and 8–12 cm depths, respectively. Under deadwood, the soil dissolved organic carbon and carbon to nitrogen ratio increased by 66% and 15% at 0–4 cm depth and by 55% and 28% at 8–12 cm depth, respectively. Deadwood also induced 71% and 92% higher microbial biomass carbon, 106% and 125% higher microbial biomass nitrogen, and 136% and 44% higher β-glucosidase activity in the soil at 0–4 cm and 8–12 cm depths, respectively. Many of the measured variables significantly correlated with soil organic carbon suggesting that deadwood modified the soil biochemical processes by altering soil carbon storage. Our results indicate the potential of thinned spruce deadwood logs to sequester carbon and improve the fertility of Podzol soils. This could be associated with the slow decay rate of spruce deadwood logs and low biological activity of Podzols that promote the accumulation of soil carbon. We propose that leaving thinning-derived deadwood on the forest floor can support soil and forest sustainability as well as carbon sequestration. Numéro de notice : A2023-215 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s10342-022-01522-z Date de publication en ligne : 07/12/2022 En ligne : https://doi.org/10.1007/s10342-022-01522-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103144 - Diversity and mean specific leaf area of Mediterranean woody vegetation changes in response to summer drought across a double stress gradient: The role of phenotypic plasticity [Article/Communication] / Alejandro Carrascosa, Auteur ; Mariola Silvestre, Auteur ; Laura Morgado, Auteur ; et al., Auteur . - 2023 . - n° e13180.bibliographieLangues : Anglais (eng)in Journal of vegetation science > vol 34 n° 2 (April 2023) . - n° e13180
Descripteur : [Termes IGN] arbuste[Termes IGN] climat méditerranéen[Termes IGN] diagnostic foliaire[Termes IGN] Espagne[Termes IGN] facteur édaphique[Termes IGN] indice foliaire[Termes IGN] plante ligneuse[Termes IGN] sécheresse[Termes IGN] stress hydrique[Vedettes matières IGN] Végétation et changement climatique Résumé : Aim: Many aspects of vegetation response to increased drought remain uncertain but it is expected that phenotypic plasticity may be key to early adaptation of plants to environmental stress. In this work we observe the response of specific leaf area (SLA) of woody shrub vegetation to the summer drought typical of the Mediterranean climate. In addition, to observe the possible interaction between the impact of drought and the environmental characteristics of the ecosystems, communities from different edaphic and structural contexts distributed along the double stress gradient of the Mediterranean mountains (high temperature and low precipitation at low elevation; low temperature and high irradiation at high elevation) have been analysed. Location: Central Mountain range of the Iberian Peninsula. Methods: Along the entire altitudinal gradient, 33 shrub communities belonging to different habitat typologies (shrublands, rocky areas, hedgerows, understorey) were sampled before and after the passage of summer, both in 2017 and 2019. A total of 1724 individuals and 15,516 leaves were collected and measured to estimate the mean values and diversity of SLA of each community. Results: The community-weighted mean and functional divergence have inverse quadratic relationships with the environmental gradient. Shrub communities at both ends of the gradient have low mean SLA values and high functional divergence of this trait. Summer drought implies a generalised decrease in the mean SLA of the communities throughout the gradient, as well as an alteration in functional richness and uniformity. However, the effect of summer drought on the plant community is mediated by the microenvironmental characteristics of its habitat. Conclusions: Drought acclimatisation of shrub communities through phenotypic plasticity leads to rapid changes in their functional leaf structure. In the long term, our results point to an increase in plant conservative strategies, reduced ecosystem productivity, slower nutrient recycling and the reduction of communities of specific habitats as drought increases. Numéro de notice : A2023-223 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1111/jvs.13180 Date de publication en ligne : 09/03/2023 En ligne : https://doi.org/10.1111/jvs.13180 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103172 - Impacts of forest management on stand and landscape-level microclimate heterogeneity of European beech forests [Article/Communication] / Joscha H. Menge, Auteur ; Paul Magdon, Auteur ; Stephan Wöllauer, Auteur ; et al., Auteur . - 2023 . - pp 903 - 917.bibliographieLangues : Anglais (eng)in Landscape ecology > vol 38 n° 4 (April 2023) . - pp 903 - 917
Descripteur : [Vedettes matières IGN] Lasergrammétrie[Termes IGN] analyse comparative[Termes IGN] données lidar[Termes IGN] éclaircie (sylviculture)[Termes IGN] écosystème forestier[Termes IGN] Fagus (genre)[Termes IGN] forêt équienne[Termes IGN] forêt inéquienne[Termes IGN] gestion forestière[Termes IGN] hêtraie[Termes IGN] microclimat[Termes IGN] régression multiple[Termes IGN] semis de points[Termes IGN] température de l'air[Termes IGN] Thuringe Résumé : (auteur) Context: Forest microclimate influences biodiversity and plays a crucial role in regulating forest ecosystem functions. It is modified by forest management as a result of changes in forest structure due to tree harvesting and thinning. Objectives: Here, we investigate the impacts of even-aged and uneven-aged forest management on stand- and landscape-level heterogeneity of forest microclimates, in comparison with unmanaged, old-growth European beech forest. Methods: We combined stand structural and topographical indices derived from airborne laser scanning with climate observations from 23 meteorological stations at permanent forest plots within the Hainich region, Germany. Based on a multiple linear regression model, we spatially interpolated the diurnal temperature range (DTR) as an indicator of forest microclimate across a 4338 ha section of the forest with 50 m spatial resolution. Microclimate heterogeneity was measured as α-, β-, and γ-diversity of thermal niches (i.e. DTR classes). Results: Even-aged forests showed a higher γ-diversity of microclimates than uneven-aged and unmanaged forests. This was mainly due to a higher β-diversity resulting from the spatial coexistence of different forest developmental stages within the landscape. The greater structural complexity at the stand-level in uneven-aged stands did not increase α-diversity of microclimates. Predicted DTR was significantly lower and spatially more homogenous in unmanaged forest compared to both types of managed forest. Conclusion: If forest management aims at creating a wide range of habitats with different microclimates within a landscape, spatially co-existing types of differently managed and unmanaged forests should be considered, instead of focusing on a specific type of management, or setting aside forest reserves only. Numéro de notice : A2023-224 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.1007/s10980-023-01596-z Date de publication en ligne : 30/01/2023 En ligne : https://doi.org/10.1007/s10980-023-01596-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103175 Detrending climate data prior to climate–growth analyses in dendroecology: a common best practice?
Detrending climate data prior to climate–growth analyses in dendroecology: a common best practice? [Article/Communication] / Clémentine Ols, Auteur ; Stefan Klesse, Auteur ; Martin P. Girardin, Auteur ; Margaret E.K. Evans, Auteur ; R. Justin DeRose, Auteur ; Valérie Trouet, Auteur . - 2023 . - n° 126094.bibliographieLangues : Anglais (eng)in Dendrochronologia > vol inconnu (2023) . - n° 126094Descripteur : [Termes IGN] cerne[Termes IGN] changement climatique[Termes IGN] croissance végétale[Termes IGN] dendrochronologie[Termes IGN] série temporelle[Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Tree growth varies closely with high–frequency climate variability. Since the 1930s detrending climate data prior to comparing them with tree growth data has been shown to better capture tree growth sensitivity to climate. However, in a context of increasingly pronounced trends in climate, this practice remains surprisingly rare in dendroecology. In a review of Dendrochronologia over the 2018-2021 period, we found that less than 20% of dendroecological studies detrended climate data prior to climate-growth analyses. With an illustrative study, we want to remind the dendroecology community that such a procedure is still, if not more than ever, rational and relevant. We investigated the effects of detrending climate data on climate–growth relationships across North America over the 1951–2000 period. We used a network of 2,536 tree individual ring-width series from the Canadian and Western US forest inventories. We compared correlations between tree growth and seasonal climate data (Tmin, Tmax, Prec) both raw and detrended. Detrending approaches included a linear regression, 30-yr and 100-yr cubic smoothing splines. Our results indicate that on average the detrending of climate data increased climate–growth correlations. In addition, we observed that strong trends in climate data translated to higher variability in inferred correlations based on raw vs. detrended climate data. We provide further evidence that our results hold true for the entire spectrum of dendroecological studies using either mean site chronologies and correlations coefficients, or individual tree time series within a mixed-effects model framework where regression coefficients are used more commonly. We show that even without a change in correlation, regression coefficients can change a lot and we tend to underestimate the true climate impact on growth in case of climate variables containing trends. This study demonstrates that treating climate and tree-ring time series “like-for-like” is a necessary procedure to reduce false negatives and positives in dendroecological studies. Concluding, we recommend using the same detrending for climate and tree growth data when tree-ring time series are detrended with splines or similar frequency-based filters. Numéro de notice : A2023-092 Affiliation des auteurs : IGN+Ext (2020- ) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.dendro.2023.126094 Date de publication en ligne : 05/05/2023 En ligne : https://doi.org/10.1016/j.dendro.2023.126094 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103182 Evenness mediates the global relationship between forest productivity and richness
Evenness mediates the global relationship between forest productivity and richness [Article/Communication] / Iris Hordijk, Auteur ; Daniel S. Maynard, Auteur ; et al., Auteur ; Olivier Bouriaud, Auteur . - 2023.bibliographieLangues : Anglais (eng)in Journal of ecology > vol inconnu (2023)Descripteur : [Termes IGN] forêt[Termes IGN] futaie irrégulière[Termes IGN] futaie régulière[Termes IGN] productivité biologique[Termes IGN] richesse floristique[Vedettes matières IGN] Foresterie Résumé : (auteur) 1. Biodiversity is an important component of natural ecosystems, with higher species richness often correlating with an increase in ecosystem productivity. Yet, this relationship varies substantially across environments, typically becoming less pronounced at high levels of species richness. However, species richness alone cannot reflect all important properties of a community, including community evenness, which may mediate the relationship between biodiversity and productivity. If the evenness of a community correlates negatively with richness across forests globally, then a greater number of species may not always increase overall diversity and productivity of the system. Theoretical work and local empirical studies have shown that the effect of evenness on ecosystem functioning may be especially strong at high richness levels, yet the consistency of this remains untested at a global scale. 2. Here, we used a dataset of forests from across the globe, which includes composition, biomass accumulation and net primary productivity, to explore whether productivity correlates with community evenness and richness in a way that evenness appears to buffer the effect of richness. Specifically, we evaluated whether low levels of evenness in speciose communities correlate with the attenuation of the richness–productivity relationship. 3. We found that tree species richness and evenness are negatively correlated across forests globally, with highly speciose forests typically comprising a few dominant and many rare species. Furthermore, we found that the correlation between diversity and productivity changes with evenness: at low richness, uneven communities are more productive, while at high richness, even communities are more productive. 4. Synthesis. Collectively, these results demonstrate that evenness is an integral component of the relationship between biodiversity and productivity, and that the attenuating effect of richness on forest productivity might be partly explained by low evenness in speciose communities. Productivity generally increases with species richness, until reduced evenness limits the overall increases in community diversity. Our research suggests that evenness is a fundamental component of biodiversity–ecosystem function relationships, and is of critical importance for guiding conservation and sustainable ecosystem management decisions. Numéro de notice : A2023-093 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.1111/1365-2745.14098 Date de publication en ligne : 02/05/2023 En ligne : https://doi.org/10.1111/1365-2745.14098 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103184 - Developing alternatives to adaptive silviculture: Thinning and tree growth resistance to drought in a Pinus species on an elevated gradient in Southern Spain [Article/Communication] / Rafael M. Navarro-Cerrillo, Auteur ; Antonio M. Cachinero-Vivar, Auteur ; Óscar Pérez-Priego, Auteur ; et al., Auteur . - 2023 . - n° 120936.bibliographieLangues : Anglais (eng)in Forest ecology and management > vol 537 (June-1 2023) . - n° 120936
Descripteur : [Termes IGN] croissance des arbres[Termes IGN] dendroécologie[Termes IGN] éclaircie (sylviculture)[Termes IGN] Espagne[Termes IGN] gestion forestière adaptative[Termes IGN] Pinus (genre)[Termes IGN] régénération (sylviculture)[Termes IGN] sécheresse[Vedettes matières IGN] Sylviculture Résumé : (auteur) Forest plantations are more vulnerable to the stress induced by biotic and abiotic factors than are naturally regenerated forests. These effects can be aggravated by a lack of management in large reforestation areas, and thinning could, therefore, help trees to reduce dieback and tree mortality related to drought. We address this question using a dendrochronology and modelling approach to improve the understanding of the growth response of high-density planted pine forests to thinning in drought-prone areas of Southern Spain. An experimental trial was, therefore, carried out with three species (Pinus halepensis, P. nigra, and P. sylvestris) and three thinning treatments (unthinned, moderate, and heavy thinning), after which growth-climate relationships and drought vulnerability indices were assessed. Three separate generalized linear mixed-effects models (GLMM), one for each species and location, were fitted using BAI as the response variable, and post-thinning growth trajectories and drought vulnerability indices were also simulated. Ten-year basal area showed strong growth responses following the thinning treatment (BAI10, 72% for P. halepensis and 50% for P. sylvestris as regards heavy thinning and 51% for P. nigra as regards moderate thinning), with different responses to precipitation and temperature according to species and thinning intensity. The significant effects of thinning on drought vulnerability indices indicated that the thinning treatments had a positive effect, irrespective of the pine species, although this was more evident in the case of P. sylvestris (recovery F = 28.10, p Numéro de notice : A2023-198 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.foreco.2023.120936 Date de publication en ligne : 28/03/2023 En ligne : https://doi.org/10.1016/j.foreco.2023.120936 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103086 - Sweet chestnut forests under black locust invasion threat and different management: An assessment of stand structure and biodiversity [Article/Communication] / Thomas Campagnaro, Auteur ; Giovanni Trentanovi, Auteur ; Simone Lacopino, Auteur ; et al., Auteur . - 2023 . - n° 120907.bibliographieLangues : Anglais (eng)in Forest ecology and management > vol 537 (June-1 2023) . - n° 120907
Descripteur : [Termes IGN] Castanea sativa[Termes IGN] forêt méditerranéenne[Termes IGN] gestion forestière[Termes IGN] insecte nuisible[Termes IGN] Italie[Termes IGN] orthoptère[Termes IGN] Robinia pseudoacacia[Vedettes matières IGN] Sylviculture Résumé : (auteur) Sweet chestnut forests in Europe are impacted by management abandonment, non-native species invasions and diseases, among other factors. Understanding the effects of these factors is crucial for forecasting future biodiversity changes, as well as proposing appropriate planning and management strategies. We studied sweet chestnut (Castanea sativa Mill.) and black locust (Robinia pseudoacacia L.) dominated forests within three hilly landscapes (Euganean hills, Montello, and Berici hills) of north-eastern Italy. We surveyed 25 paired sweet chestnut and black locust dominated plots of 100 m2 representing coppice or over-aged stands. We collected and analysed data related to vascular plant composition and richness, soil physical features (moisture content, shear strength and penetration resistance), ammonia-oxidising archaea in the soil, and stand structure features. Composition of vascular plants differed significantly between the two forest types, without the influence of management regime. Soil characteristics did not change comparing forest types, management regimes and their interaction, except for soil moisture that was higher in coppice forests. Ammonia-oxidising archaea abundance was lower in sweet chestnut stands. Sweet chestnut and black locust forests have a similar stand structure. The management regime played a role in determining mean diameter, number of stems and deadwood volume. We suggest adopting a heterogeneous array of silviculture practices to achieve the highest variety of forest structures and plant composition in Mediterranean hilly landscapes, coupled with management practices aimed at black locust control. Numéro de notice : A2023-199 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.foreco.2023.120907 Date de publication en ligne : 22/03/2023 En ligne : https://doi.org/10.1016/j.foreco.2023.120907 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103090 Mapping territorial vulnerability to wildfires: A participative multi-criteria analysis
Mapping territorial vulnerability to wildfires: A participative multi-criteria analysis [Article/Communication] / Miguel Rivière, Auteur ; Jonathan Lenglet, Auteur ; Adrien Noirault, Auteur ; et al., Auteur . - 2023.Langues : Anglais (eng)in Forest ecology and management > vol 539 (July-1 2023)Descripteur : [Vedettes matières IGN] Cartographie thématique[Termes IGN] analyse de sensibilité[Termes IGN] analyse multicritère[Termes IGN] cartographie des risques[Termes IGN] incendie de forêt[Termes IGN] processus de hiérarchisation analytique[Termes IGN] Rhône-Méditerranée-Corse[Termes IGN] système d'information géographique[Termes IGN] utilisation du sol[Termes IGN] vulnérabilité Numéro de notice : A2023-216 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article DOI : 10.1016/j.foreco.2023.121014 Date de publication en ligne : 22/04/2023 En ligne : https://doi.org/10.1016/j.foreco.2023.121014 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103146 - Forest age and topographic position jointly shape the species richness and composition of vascular plants in karstic habitats [Article/Communication] / Zoltán Bátori, Auteur ; Csaba Tölgyesi, Auteur ; Gábor Li, Auteur ; et al., Auteur . - 2023 . - n° 16.bibliographieLangues : Anglais (eng)in Annals of Forest Science > vol 80 n° 1 (2023) . - n° 16
Descripteur : [Termes IGN] âge du peuplement forestier[Termes IGN] changement climatique[Termes IGN] gestion forestière[Termes IGN] habitat d'espèce[Termes IGN] karst[Termes IGN] pente[Termes IGN] topographie locale[Termes IGN] Tracheophyta[Vedettes matières IGN] Sylviculture Résumé : (auteur) Key message: Dolines may provide important safe havens for many plant species and play a key role in maintaining biodiversity. The combined effects of forest age and topographic position influence the biodiversity patterns of these unique habitats. Forest managers, conservationists, and researchers need to work together in order to maintain the species richness and composition of these habitats under environmental changes. Context: Dolines are the most prominent geomorphological features in many karst landscapes that may provide important microhabitats for many species. Aims: We aim to contribute to a better understanding of how forest age and topographic position influence the plant species richness and composition of vascular plants within doline habitats. Methods: We studied the effects of forest age (four age classes: from 5- to 10-year-old stands to more than 90-year-old stands), topographic position (south-facing slope, bottom, and north-facing slope), and their interaction on the distribution of vascular plants and mean Ellenberg indicator values in dolines using detrended correspondence analysis and mixed-effects models. Diagnostic species for the forest age classes and topographic positions were also determined. Results: Different groups of vascular plant species usually showed significant preferences for certain topographic positions and/or forest age classes in dolines. In general, the number of species in all studied groups of plants increased after a few years of canopy removal. The number of plant species in almost all groups was lowest in dolines covered with 40–45-year-old forests. The moist and nutrient-rich doline bottoms covered with 90–120-year-old forests harboured many climate change vulnerable plant species. Conclusions: Forest age and topographic position considerably influence the species richness and composition of vascular plants in dolines; therefore, forest managers and conservationists need to consider their potential impacts when evaluating the effects of climate warming on karst landscapes. Numéro de notice : A2023-188 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1186/s13595-023-01183-x Date de publication en ligne : 31/03/2023 En ligne : https://doi.org/10.1186/s13595-023-01183-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102967
