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Factors affecting forest dynamics in the Iberian Peninsula from 1987 to 2012 : The role of topography and drought / Juan José Vidal-Macua in Forest ecology and management, vol 406 (15 December 2017)  

Public [article]  inForest ecology and management > vol 406 (15 December 2017) . - pp 290 - 306 Titre : Factors affecting forest dynamics in the Iberian Peninsula from 1987 to 2012 : The role of topography and drought Type de document : Article/Communication Auteurs : Juan José Vidal-Macua, Auteur ; Miquel Ninyerola, Auteur ; Alaitz Zabala, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 290 - 306 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] analyse diachronique [Termes IGN] classification et arbre de régression [Termes IGN] détail topographique [Termes IGN] dynamique de la végétation [Termes IGN] facteur édaphique [Termes IGN] feuillu [Termes IGN] péninsule Ibérique [Termes IGN] Pinophyta [Termes IGN] rayonnement solaire [Termes IGN] sécheresse Résumé : (auteur) Numéro de notice : A2017-809 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.foreco.2017.10.011 En ligne : https://doi.org/10.1016/j.foreco.2017.10.011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89249 [article]

Continuum of floristic composition between two plant communities – Carici elongatae-Alnetum and Fraxino-Alnetum / Natalia Czapiewska in Forest research papers, vol 78 n° 4 (November 2017)  

Public [article]  inForest research papers > vol 78 n° 4 (November 2017) . - pp 285 - 296 Titre : Continuum of floristic composition between two plant communities – Carici elongatae-Alnetum and Fraxino-Alnetum Type de document : Article/Communication Auteurs : Natalia Czapiewska, Auteur ; Sonia Paz, Auteur ; Marcin K. Dyderski, Auteur ; Andrzej M. Jagodzinski, Auteur Année de publication : 2017 Article en page(s) : pp 285 - 296 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Alnus (genre) [Termes IGN] carex (genre) [Termes IGN] continuité écologique [Termes IGN] dynamique de la végétation [Termes IGN] forêt marécageuse [Termes IGN] forêt ripicole [Termes IGN] Fraxinus (genre) [Termes IGN] incertitude des données [Termes IGN] phytosociologie [Termes IGN] placette d'échantillonnage [Termes IGN] unité phytosociologique [Vedettes matières IGN] Ecologie forestière Résumé : (Auteur) One of the crucial debates in vegetation ecology is whether plant communities are discontinuous, distinguishable units or whether they change continuously. Phytosociology assumes discontinuity and its methodology requires subjective sampling during vegetation inventories. For that reason, some researchers argue that phytosociology artificially creates discontinuity among plant communities. Our aim was to assess the continuity between ash-alder riparian forest (Fraxino-Alnetum), and alder swamp forest (Carici elongatae-Alnetum), and to check whether discontinuity observed between these two plant associations is an effect of subjective sample plot choice. We conducted 57 phytosociological relevés within a regular grid covering potential sites of both plant communities. All relevés were arranged in order of decreasing relative cover of the diagnostic species for each plant association resulting in a gentle gradient, indicating a continuous transition from Fraxino-Alnetum to Carici elongatae-Alnetum. Similar results were obtained by detrended correspondence analysis. The proportion of species from the Querco-Fagetea class, typical to Fraxino-Alnetum, was decreasing with increasing proportion of species from the Alnetea glutinosae class, typical to Carici elongatae-Alnetum. This shift followed a gradient of ecological light-moisture indicator values. Our results confirmed continuous transition between two plant communities and led us to the conclusion that discontinuity resulted from the standard sampling protocol used in classical phytosociology. This protocol, however, is useful in searching for typological patterns, required for classification of plant communities, which is the main aim of phytosociology. Nevertheless, it does not provide full insight into the variability of vegetation and introduces uncertainty when trying to understand ecosystem dynamics. This uncertainty should be taken into account when phytosociological data are used for nature conservation recommendations and to draw conclusion about vegetation dynamics. Numéro de notice : A2017-879 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/frp-2017-0032 Date de publication en ligne : 17/05/2018 En ligne : https://doi.org/10.1515/frp-2017-0032 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91160 [article]

Forest modelling: the gamma shape mixture model and simulation of tree diameter distributions / Rafał Podlaski in Annals of Forest Science, vol 74 n° 2 (June 2017)  

Public [article]  inAnnals of Forest Science > vol 74 n° 2 (June 2017) Titre : Forest modelling: the gamma shape mixture model and simulation of tree diameter distributions Type de document : Article/Communication Auteurs : Rafał Podlaski, Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] arbre (flore) [Termes IGN] densité de la végétation [Termes IGN] diamètre à hauteur de poitrine [Termes IGN] diamètre des arbres [Termes IGN] dynamique de la végétation [Termes IGN] estimation par noyau [Termes IGN] modèle de simulation [Termes IGN] modélisation de la forêt [Termes IGN] surveillance de la végétation Résumé : (auteur) Key message: New types of distribution functions are needed to model the dynamics of stands where important age classes are represented by few trees. In this study, the gamma shape mixture model and two simulation methods were used for generating tree diameter data. • Context: To analyse forest dynamics, it is necessary to know distribution of the characteristics (mainly tree diameters) of trees forming particular developmental phases. In many forest inventories, the measurement of large diameter at breast height (DBH) samples is practically impossible. In this case, DBH distributions can be generated using theoretical models. • Aims: The aim of this study was to assess the precision of the approximation of empirical DBH data using the gamma shape mixture (GSM) model and kernel density estimation. The strengths and weaknesses of the two simulation methods were presented and discussed. • Methods: The GSM model was adopted to approximate empirical DBH data collected in 20 near-natural stands. Two simulation methods were used: (a) the procedure based on a multimodal distribution and gamma random numbers (MDGR procedure) and (b) MCMC techniques with Metropolis–Hastings sampling (MH method). • Results: The GSM model precisely fitted the investigated DBH distributions. The MDGR procedure was slightly more precise than the MH method, especially in the case of the samples of 250 DBHs. The level of homogeneity within the drawn DBH sets was similar for all samples. • Conclusion: The GSM model is very flexible. The DBH random variates, generated with the use of analysed procedures, represented all tree generations being significant from a biological point of view. Numéro de notice : A2017-109 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-017-0629-y Date de publication en ligne : 03/04/2017 En ligne : https://doi.org/10.1007/s13595-017-0629-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84500 [article]

A hybrid genetic algorithm with local optimiser improves calibration of a vegetation change cellular automata model / Rachel Whitsed in International journal of geographical information science IJGIS, vol 31 n° 3-4 (March-April 2017)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 31 n° 3-4 (March-April 2017) . - pp 717 - 737 Titre : A hybrid genetic algorithm with local optimiser improves calibration of a vegetation change cellular automata model Type de document : Article/Communication Auteurs : Rachel Whitsed, Auteur ; Lisa T. Smallbone, Auteur Année de publication : 2017 Article en page(s) : pp 717 - 737 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme génétique [Termes IGN] arbre (flore) [Termes IGN] automate cellulaire [Termes IGN] croissance des arbres [Termes IGN] dynamique de la végétation [Termes IGN] étalonnage des données [Termes IGN] inventaire forestier (techniques et méthodes) [Termes IGN] modèle de croissance végétale [Termes IGN] optimisation (mathématiques) [Termes IGN] sous-bois [Termes IGN] Victoria (Australie) [Vedettes matières IGN] Foresterie Résumé : (Auteur) Cellular automata (CA) models are commonly used to model vegetation dynamics, with the genetic algorithm (GA) being one method of calibration. This article investigates different GA settings, as well as the combination of a GA with a local optimiser to improve the calibration effort. The case study is a pattern-calibrated CA to model vegetation regrowth in central Victoria, Australia. We tested 16 GA models, varying population size, mutation rate, and level of allowable mutation. We also investigated the effect of applying a local optimiser, the Nelder‒Mead Downhill Simplex (NMDS) at GA convergence. We found that using a decreasing mutation rate can reduce computational cost while avoiding premature GA convergence, while increasing population size does not make the GA more efficient. The hybrid GA-NMDS can also reduce computational cost compared to a GA alone, while also improving the calibration metric. We conclude that careful consideration of GA settings, including population size and mutation rate, and in particular the addition of a local optimiser, can positively impact the efficiency and success of the GA algorithm, which can in turn lead to improved simulations using a well-calibrated CA model. Numéro de notice : A2017-081 Affiliation des auteurs : non IGN Thématique : FORET/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2016.1231315 En ligne : http://dx.doi.org/10.1080/13658816.2016.1231315 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84344 [article]

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Birds and plants: Comparing biodiversity indicators in eight lowland agricultural mosaic landscapes in Hungary / Gergő Gábor Nagy in Ecological indicators, vol 73 (February 2017)  

Public [article]  inEcological indicators > vol 73 (February 2017) . - pp 566 - 573 Titre : Birds and plants: Comparing biodiversity indicators in eight lowland agricultural mosaic landscapes in Hungary Type de document : Article/Communication Auteurs : Gergő Gábor Nagy, Auteur ; Marta Ladányi, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 566 - 573 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Aves [Termes IGN] biodiversité [Termes IGN] dynamique de la végétation [Termes IGN] habitat (nature) [Termes IGN] Hongrie [Termes IGN] indicateur de biodiversité [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) This study compares biodiversity indicators based on plant and bird communities in eight mosaic landscapes in Hungary, dominated by a mixture of agro-ecosystems and grasslands. The eight landscapes were selected to represent the diversity of the mixed agricultural landscapes of South-East Europe, where a mosaic pattern of intensively managed farmlands and high nature value semi natural grasslands is still relatively prevalent. Bird communities were described using several assemblage-level (species number, total abundance, and Shannon diversity of the assemblage, based on 15 pre-selected key farmland bird species), as well as species-level (presence/absence of the 15 bird species) indicators, which were checked against a synthetic landscape quality indicator describing the degradation of the local plant communities with respect to an ideal baseline (vegetation-based natural capital index, NCI). The authors were interested if and how the assemblage- and species-level bird indicators can describe landscape quality in South-East European agricultural mosaic landscapes. It was found that assemblage-level bird indicators were poorly associated to the landscape quality measured in terms of NCI: only total abundance correlated significantly with NCI. On the other hand, species-level indicators were much more successful in predicting landscape quality. Six (Alauda arvensis, Emberiza calandra, Falco tinnunculus, Motacilla flava, Limosa limosa, Vanellus vanellus) of the 15 farmland bird species studied showed significant positive correlation with NCI, while three species (Emberiza citrinella, Galerida cristata, Sylvia communis) exhibited negative correlations. We also found that it was possible to draw conclusions about the landscape quality in an agricultural landscape based on the bird communities better, than to predict the bird assemblages from vegetation condition. The negative correlations for species that indicate good quality habitats in Western Europe, underline the context specificity of biodiversity indicators: whereas the conditions preferred by these species can be considered relatively natural in Western Europe, they correspond to relatively degraded habitats in South-East Europe. The nine farmland bird species which showed a significant connection to NCI can be seen as potential candidates for a regional Farmland Bird Index customized for agricultural landscapes in South-East Europe, in the Pannonian biogeographic region, or in Hungary. Numéro de notice : A2017-001 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.ecolind.2016.09.053 En ligne : http://dx.doi.org/10.1016/j.ecolind.2016.09.053 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82481 [article]

Climatic microrefugia under anthropogenic climate change: implications for species redistribution / Jonathan Lenoir in Ecography, vol 40 n° 2 (February 2017)  

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Les prairies de l’estuaire de la Loire : étude de la dynamique de la végétation de 1982 à 2014 / Mathieu Le Dez in Mappemonde, n° 119 (janvier 2017)  

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Comparing close-to-nature silviculture with processes in pristine forests: lessons from Central Europe / Jean-Philippe Schütz in Annals of Forest Science, vol 73 n° 4 (December 2016)  

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Long-term vegetation dynamics and land-use history: Providing a baseline for conservation strategies in protected Alnus glutinosa swamp woodlands / Brith Natlandsmyr in Forest ecology and management, vol 372 (15 July 2016)    

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To die or not to die: Forest dynamics in Switzerland under climate change / Nicolas Bircher (2015)  

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Deadwood and tree microhabitat dynamics in unharvested temperate mountain mixed forests: A life-cycle approach to biodiversity monitoring / Laurent Larrieu in Forest ecology and management, vol 334 ([15/12/2014])  

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Model-based analysis–synthesis for realistic tree reconstruction and growth simulation / Corina Iovan in IEEE Transactions on geoscience and remote sensing, vol 52 n° 2 (February 2014)  

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Les approches intégratives en tant qu‘opportunités de conservation de la biodiversité forestière / Daniel Kraus (2013) 

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La France des friches / Annik Schnitzler (2012)

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Dynamique des forêts mélangées sur le Mont-Ventoux : effets de l'altitude et de la gestion / Philippe Dreyfus in Rendez-vous techniques, n° 27-28 (hiver - printemps 2010)

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