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The use of large databases to characterize habitat types: the case of Quercus suber woodlands in Europe / Emiliano Agrillo in Rendiconti Lincei. Scienze Fisiche e Naturali, vol 29 n° 2 (June 2018)
[article]
Titre : The use of large databases to characterize habitat types: the case of Quercus suber woodlands in Europe Type de document : Article/Communication Auteurs : Emiliano Agrillo, Auteur ; Nicola Alessi, Auteur ; Borja Jimenez-Alfaro, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 283 - 293 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Europe (géographie physique)
[Termes IGN] habitat (nature)
[Termes IGN] habitat forestier
[Termes IGN] Quercus suber
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) The conservation of habitat types has been recognized to be of relevant importance for the conservation of biodiversity and is a major concern in the European Union. With the 92/43/EEC Habitats Directive, the European Commission targeted these habitat types, which conservation must be ensured by Member States. In this context, the Habitat type 9330 “Quercus suber forests” is intended to ensure the conservation of cork oak woodlands in Europe. To support the enhancement of nature conservation policies, in this study we provide a classification of cork oak woodlands in Europe using a large vegetation database. We identify four major groups with clear biogeographic differences and characterize them by lists of indicator species. We also provide distribution maps based on occurrence data and the modelled potential area of distribution as an additional tool for conservation. This study offers a contribution to the comparative description of the European Q. suber woodlands subtypes and to establish a protocol for habitat monitoring and assessment. Numéro de notice : A2018-210 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s12210-018-0703-x Date de publication en ligne : 30/04/2018 En ligne : https://doi.org/10.1007/s12210-018-0703-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89975
in Rendiconti Lincei. Scienze Fisiche e Naturali > vol 29 n° 2 (June 2018) . - pp 283 - 293[article]High-pruning of silver birch (Betula pendula Roth): work efficiency as a function of pruning method, pole saw type, slash removal, operator, pruning height and branch characteristics / Jens Peter Skovsgaard in International Journal of Forest Engineering, vol 29 n° 2 ([15/05/2018])
[article]
Titre : High-pruning of silver birch (Betula pendula Roth): work efficiency as a function of pruning method, pole saw type, slash removal, operator, pruning height and branch characteristics Type de document : Article/Communication Auteurs : Jens Peter Skovsgaard, Auteur ; Clémentine Ols , Auteur ; Rebecka Mc Carthy, Auteur Année de publication : 2018 Projets : 1-Pas de projet / Article en page(s) : pp 117 - 127 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Betula pendula
[Termes IGN] élagage (sylviculture)
[Vedettes matières IGN] SylvicultureRésumé : (auteur) The objective of this study was to establish an operational model of work efficiency (net or productive work time per tree) for high-pruning of young silver birch depending on pruning method, pole saw type, operator, pruning height and branch characteristics. The final model included number of branches, cross-sectional area of the thickest branch at the cut, pruning height, pruning method (target or flush pruning) and operator as independent variables. Work time increased with increasing values of each of the three numeric variables. For a given pruning height the number of branches was for all practical purposes more influential than the size of the largest branch. Target pruning was significantly faster than flush pruning, all else being equal. The variation in work efficiency for the five operators in the study spanned a range almost twice as large as that attributed to pruning method. The mean work time for other activities during the pruning operation (supportive work time) was estimated at 17% of the productive work time for pruning. Numéro de notice : A2018-019 Affiliation des auteurs : LIF+Ext (2012-2019) Autre URL associée : vers HAL Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/14942119.2018.1462593 Date de publication en ligne : 15/05/2018 En ligne : https://doi.org/10.1080/14942119.2018.1462593 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93826
in International Journal of Forest Engineering > vol 29 n° 2 [15/05/2018] . - pp 117 - 127[article]Very large trees in a lowland old-growth beech (Fagus sylvatica L.) forest : Density, size, growth and spatial patterns in comparison to reference sites in Europe / Kris Vandekerkhove in Forest ecology and management, vol 417 (15 May 2018)
[article]
Titre : Very large trees in a lowland old-growth beech (Fagus sylvatica L.) forest : Density, size, growth and spatial patterns in comparison to reference sites in Europe Type de document : Article/Communication Auteurs : Kris Vandekerkhove, Auteur ; Margot Vanhellemont, Auteur ; Tomas Vrska, Auteur ; Peter Meyer, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 1 - 17 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] distribution spatiale
[Termes IGN] données dendrométriques
[Termes IGN] Europe du nord
[Termes IGN] Fagus sylvatica
[Termes IGN] forêt ancienne
[Termes IGN] forêt secondaireRésumé : (Auteur) The frequent occurrence of very large trees (diameter at breast height DBH ≥ 80 cm) is a typical element of both primary and secondary old-growth forests. We analyzed the characteristics of very large trees in one of the few stands of lowland old-growth beech forest in Northwestern Europe, regenerated around 1775 and left unmanaged since 1986. We examined their density, diameter range, increment, mortality rate and spatial distribution, based on repeated full dendrometric surveys. In order to evaluate the results, we compared them to original datasets from primary and secondary old-growth beech forests in Europe, and an extensive reference table, compiled from inventories and literature.
In our study site, the density of very large trees increased from 31.5 to 34.3 trees ha−1 over the last 25 years, reaching a median DBH of 97 cm (mean 98.9), with the largest tree attaining a DBH of 159 cm. Although the trees were over 240 years old, they still showed an average DBH increment of 4.75 mm year−1 and a low mortality rate (0.89% year−1), indicating that they were still vital. These figures are remarkably high compared to other old-growth beech forest reference sites, where the density of very large trees generally varies between 5 and 20 trees ha−1 (median value 13.1), with a median diameter of 85–90 cm and maximum DBH for beech trees rarely exceeding 100–130 cm.
The regular spatial distribution pattern of the very large trees in the studied stand clearly differed from a typical old-growth stand, in which very large trees are randomly distributed. Over the last 25 years though, because of random mortality and ingrowth, the spatial distribution gradually became more random.
The extraordinary densities and sizes of the very large trees in our study site can be explained by the favorable climate and site conditions that promote high increments, in combination with the former management interventions of tending and thinning that resulted in continuous non-suppressed growth. Although derived from a very specific case with particular conditions, our observations may be relevant to other beech forests, as they tend to reset certain baseline assumptions for tree size and longevity potential of beech in Northwestern Europe.Numéro de notice : A2018-468 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.foreco.2018.02.033 Date de publication en ligne : 02/03/2018 En ligne : https://doi.org/10.1016/j.foreco.2018.02.033 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91148
in Forest ecology and management > vol 417 (15 May 2018) . - pp 1 - 17[article]Cartographie des défoliations du massif forestier du Pays des étangs en Lorraine : Apports potentiels de la télédétection / Thierry Bélouard in Revue forestière française, vol 70 n° 5 (2018)
[article]
Titre : Cartographie des défoliations du massif forestier du Pays des étangs en Lorraine : Apports potentiels de la télédétection Type de document : Article/Communication Auteurs : Thierry Bélouard , Auteur ; Hubert Schmuck, Auteur ; Louis-Michel Nageleisen, Auteur ; Dominique Guyon, Auteur Année de publication : 2018 Article en page(s) : pp 473 - 486 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse diachronique
[Termes IGN] BD forêt
[Termes IGN] carte de la végétation
[Termes IGN] chênaie
[Termes IGN] classification par forêts d'arbres décisionnels
[Termes IGN] défoliation
[Termes IGN] image Landsat
[Termes IGN] image Sentinel-MSI
[Termes IGN] image Terra-MODIS
[Termes IGN] Lorraine
[Termes IGN] matrice de confusion
[Termes IGN] Moselle (57)
[Termes IGN] Quercus pedunculata
[Termes IGN] santé des forêtsRésumé : (auteur) Depuis le début des années 2000, les chênaies du massif forestier du Pays des étangs en Lorraine, massif essentiellement feuillu, subissent des dépérissements importants, aux causes multiples (insectes défoliateurs, sécheresse et canicule de 2003). La chenille processionnaire du chêne y joue un rôle essentiel en provoquant de nombreuses et importantes défoliations depuis les années 1990. Cette étude exploratoire montre qu’en s’appuyant sur des observations de terrain comme données de référence, une cartographie des défoliations des années 2010 peut être réalisée à partir d’images satellitaires. La méthode s’appuie sur des images à moyenne (MODIS) et haute (Landsat) résolutions spatiales, acquises à plusieurs dates dans l’année, d’une part, et sur une méthode de classification supervisée basée sur les forêts aléatoires d’arbres de décision, d’autre part. Une extrapolation permet d’avoir des indications sur le niveau des défoliations localement. Des améliorations de la méthode sur plusieurs points (meilleure adéquation entre les observations de terrain et les images, utilisation des images satellitaires Sentinel-2, choix des prédicteurs issus des images) sont envisagées afin de l’utiliser pour d’autres forêts subissant également d’importantes défoliations. Numéro de notice : A2018-650 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.4267/2042/70132 Date de publication en ligne : 25/04/2019 En ligne : https://doi.org/10.4267/2042/70132 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93429
in Revue forestière française > vol 70 n° 5 (2018) . - pp 473 - 486[article]Mapping spatial variability of foliar nitrogen in coffee (Coffea arabica L.) plantations with multispectral Sentinel-2 MSI data / Abel Chemura in ISPRS Journal of photogrammetry and remote sensing, vol 138 (April 2018)
[article]
Titre : Mapping spatial variability of foliar nitrogen in coffee (Coffea arabica L.) plantations with multispectral Sentinel-2 MSI data Type de document : Article/Communication Auteurs : Abel Chemura, Auteur ; Onisimo Mutanga, Auteur ; John Odindi, Auteur ; Dumisani Kutywayo, Auteur Année de publication : 2018 Article en page(s) : pp 1 - 11 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] agriculture de précision
[Termes IGN] classification par forêts d'arbres décisionnels
[Termes IGN] Coffea arabica
[Termes IGN] feuille (végétation)
[Termes IGN] image Sentinel-MSI
[Termes IGN] nutriment végétal
[Termes IGN] teneur en azoteRésumé : (auteur) Nitrogen (N) is the most limiting factor to coffee development and productivity. Therefore, development of rapid, spatially explicit and temporal remote sensing-based approaches to determine spatial variability of coffee foliar N are imperative for increasing yields, reducing production costs and mitigating environmental impacts associated with excessive N applications. This study sought to assess the value of Sentinel-2 MSI spectral bands and vegetation indices in empirical estimation of coffee foliar N content at landscape level. Results showed that coffee foliar N is related to Sentinel-2 MSI B4 (R2 = 0.32), B6 (R2 = 0.49), B7 (R2 = 0.42), B8 (R2 = 0.57) and B12 (R2 = 0.24) bands. Vegetation indices were more related to coffee foliar N as shown by the Inverted Red-Edge Chlorophyll Index – IRECI (R2 = 0.66), Relative Normalized Difference Index – RNDVI (R2 = 0.48), CIRE1 (R2 = 0.28), and Normalized Difference Infrared Index – NDII (R2 = 0.37). These variables were also identified by the random forest variable optimisation as the most valuable in coffee foliar N prediction. Modelling coffee foliar N using vegetation indices produced better accuracy (R2 = 0.71 with RMSE = 0.27 for all and R2 = 0.73 with RMSE = 0.25 for optimized variables), compared to using spectral bands (R2 = 0.57 with RMSE = 0.32 for all and R2 = 0.58 with RMSE = 0.32 for optimized variables). Combining optimized bands and vegetation indices produced the best results in coffee foliar N modelling (R2 = 0.78, RMSE = 0.23). All the three best performing models (all vegetation indices, optimized vegetation indices and combining optimal bands and optimal vegetation indices) established that 15.2 ha (4.7%) of the total area under investigation had low foliar N levels ( Numéro de notice : A2018-145 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2018.02.004 Date de publication en ligne : 10/02/2018 En ligne : https://doi.org/10.1016/j.isprsjprs.2018.02.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89753
in ISPRS Journal of photogrammetry and remote sensing > vol 138 (April 2018) . - pp 1 - 11[article]Réservation
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