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Density dependence on tree survival in an old-growth temperate forest in northeastern China / Jian Zhang in Annals of Forest Science, Vol 66 n° 2 (march 2009)
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Titre : Density dependence on tree survival in an old-growth temperate forest in northeastern China Titre original : La survie des arbres dépend de la densité dans une ancienne forêt tempérée du nord-est de la Chine Type de document : Article/Communication Auteurs : Jian Zhang, Auteur ; Zhanqing Hao, Auteur ; I.-Fang Sun, Auteur ; Bo Song, Auteur ; Ji Ye, Auteur ; Buhang Li, Auteur ; Xugao Wang, Auteur Année de publication : 2009 Article en page(s) : n° 204 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] Chine
[Termes IGN] densité de la végétation
[Termes IGN] dépérissement
[Termes IGN] étage de végétation
[Termes IGN] forêt tempérée
[Termes IGN] mortalité
[Termes IGN] structure spatialeRésumé : (auteur) Density dependence is a major mechanism for shaping plant communities. However, its role in regulating diverse, mixed natural tree communities is less certain. In this study we investigated density-dependent effects in a large-scale (25 ha) old-growth temperate forest in northeastern China. Spatial patterns of neighborhood distribution in the plot were analyzed using various methods for inferring competition, including (1) pair correlation function to determine spatial patterns of pre-mortality and post-mortality and (2) neighborhood analysis of individuals to examine the extent to which tree survival is correlated with other covariates. Results showed that, for common species, 3 of 5 canopy species and 3 of 8 midstory and understory species were random in mortality. Negative density-dependent mortality was not found when trees reach 1 cm in DBH. There was no significant correlation for canopy species between tree survival and conspecific abundance, but largely positive correlations for midstory and understory species. In contrast, tree survival was found to negatively correlate with conspecific basal area for most species, indicating strong intraspecific competition. No strong interspecific density dependence was found in the forest. Numéro de notice : A2009-715 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2008086 Date de publication en ligne : 28/02/2009 En ligne : https://www.afs-journal.org/articles/forest/abs/2009/02/f08149/f08149.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71944
in Annals of Forest Science > Vol 66 n° 2 (march 2009) . - n° 204[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-001-P000317 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Pan-European forest/non forest mapping with Landsat ETM+ and Corine Land Cover 2000 data / A. Pekkarinen in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 2 (March - April 2009)
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Titre : Pan-European forest/non forest mapping with Landsat ETM+ and Corine Land Cover 2000 data Type de document : Article/Communication Auteurs : A. Pekkarinen, Auteur ; L. Reithmaier, Auteur ; Peter Strobl, Auteur Année de publication : 2009 Article en page(s) : pp 171 - 183 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse comparative
[Termes IGN] analyse de groupement
[Termes IGN] analyse spectrale
[Termes IGN] carte d'occupation du sol
[Termes IGN] classification barycentrique
[Termes IGN] classification dirigée
[Termes IGN] Corine Land Cover
[Termes IGN] Europe (géographie politique)
[Termes IGN] forêt
[Termes IGN] image Landsat-ETM+
[Termes IGN] segmentation d'imageRésumé : (Auteur) This paper describes a simple and adaptive methodology for large area forest/non-forest mapping using Landsat ETM+ imagery and CORINE Land Cover 2000. The methodology is based on scene-by-scene analysis and supervised classification. The fully automated processing chain consists of several phases, including image segmentation, clustering, adaptive spectral representativity analysis, training data extraction and nearest-neighbour classification. This method was used to produce a European forest/non-forest map through the processing of 415 Landsat ETM+ scenes. The resulting forest/non-forest map was validated with three independent data sets. The results show that the map’s overall point-level agreement with our validation data generally exceeds 80%, and approaches 90% in central European conditions. Comparison with country-level forest area statistics shows that in most cases the difference between the forest proportion of the derived map and that computed from the published forest area statistics is below 5%. Copyright ISPRS Numéro de notice : A2009-096 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.09.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.09.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29726
in ISPRS Journal of photogrammetry and remote sensing > vol 64 n° 2 (March - April 2009) . - pp 171 - 183[article]Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 081-09021 RAB Revue Centre de documentation En réserve L003 Disponible 081-09022 RAB Revue Centre de documentation En réserve L003 Disponible The view from space: taking corporate sustainability to new heights / P.p Matthieu in Geoinformatics, vol 12 n° 3 (01/03/2009)
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Titre : The view from space: taking corporate sustainability to new heights Type de document : Article/Communication Auteurs : P.p Matthieu, Auteur Année de publication : 2009 Article en page(s) : pp 26 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] développement durable
[Termes IGN] environnement
[Termes IGN] forêt
[Termes IGN] industrie minière
[Termes IGN] observation de la Terre
[Termes IGN] occupation du sol
[Termes IGN] surveillance écologiqueRésumé : (Editeur) Over the last decades, Corporate Sustainable Development (CSD) has become one of the most important challenges for companies facing increasing pressure from regulators and their stakeholders. This new type of sustainability reporting is quite difficult to perform in a consistent and objective manner, as business activities are often large-scale (and even global) and stakeholders (sometimes with diverging interests) can have different views on the positive and negative impact of business activities. Pierre-Philippe Matthieu, who works for the European Space Agency (ESA), explains how earth observation satellites can help in this endeavor. Copyright GEOinformatics Numéro de notice : A2009-138 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29768
in Geoinformatics > vol 12 n° 3 (01/03/2009) . - pp 26 - 31[article]Why and where do adult trees die in a young secondary temperate forest? The role of neighbourhood / José Miguel Olano in Annals of Forest Science, Vol 66 n° 1 (January - February 2009)
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Titre : Why and where do adult trees die in a young secondary temperate forest? The role of neighbourhood Titre original : Pourquoi et où les arbres adultes meurent dans une jeune forêt tempérée ? Le rôle du voisinage Type de document : Article/Communication Auteurs : José Miguel Olano, Auteur ; Nere Amaia Laskurain, Auteur ; Adrián Escudero, Auteur ; Marcelino De La Cruz, Auteur Année de publication : 2009 Article en page(s) : n° 105 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] dépérissement
[Termes IGN] forêt tempérée
[Termes IGN] modèle mathématique
[Termes IGN] mortalité
[Termes IGN] peuplement mélangé
[Vedettes matières IGN] SylvicultureRésumé : (auteur) The density and identity of tree neighbourhood is a key factor to explain tree mortality in forests, especially during the stem exclusion phase. $\bullet$ To understand this process, we built a logistic model for mortality in a spatially explicit context, including tree and neighbourhood predictors. Additionally, we used this model to build mortality risk frequency distributions. Finally, we tested this model against a random mortality model to predict the spatial pattern of the forest. $\bullet$ Annual mortality rate was high for pedunculate oak (Quercus robur, 6.99%), moderate for birch (Betula celtiberica, 2.19%) and Pyrenean oak (Q. pyrenaica, 1.58%) and low for beech (Fagus sylvatica, 0.26%). Mortality risk models for pedunculate oak and birch included stem diameter, tree height, canopy position and neighbourhood. Mortality was affected by the specific nature of the neighbourhood showing a clear competitive hierarchy: beech > pedunculate oak > birch. Models based on random mortality and logistic regression model were able to predict the spatial pattern of survivors although logistic regression predictions were more accurate. $\bullet$ Our study highlights how simple models such as the random mortality one may obscure much more complex spatial interactions. Numéro de notice : A2009-724 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest:2008074 Date de publication en ligne : 14/01/2009 En ligne : https://www.afs-journal.org/articles/forest/abs/2009/01/f08212/f08212.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71763
in Annals of Forest Science > Vol 66 n° 1 (January - February 2009) . - n° 105[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-DIR-P000294 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Basic features of a group selection system modification aimed to sustain regular-uneven-aged stand structure / Roman Efremov in Annals of forest research, vol 52 n° 1 (January 2009)
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Titre : Basic features of a group selection system modification aimed to sustain regular-uneven-aged stand structure Type de document : Article/Communication Auteurs : Roman Efremov, Auteur Année de publication : 2009 Article en page(s) : p. 143-150 Note générale : Bibliogr. Langues : Anglais (eng) Descripteur : [Termes IGN] Fagus sylvatica
[Termes IGN] forêt inéquienne
[Termes IGN] structure d'un peuplement forestier
[Vedettes matières IGN] BotaniqueRésumé : (Auteur) "Proposed modification of group selection system is aimed to successfully combine its elements with biological peculiarities (such as sympodial growth, distinct heliotropism and crown growth plasticity, heavy seeds and difficult dissemination, etc.) of shade-intolerant and mid-tolerant tree species, stands of which may be managed under the same system. Principles, on which the modification is based, are: (i) application of well founded extended rotations in order to increase the proportion of tree groups above 90-100 years age in the stand, where upon the height increment and crown side spread by most of the main tree species in Bulgary drop to considerably lower level, and (ii) optimum systematic spatial positioning of openings in the stand canopy (and tree groups respectively) over the stand area, so that new gaps created by consecutive selection cuttings adjoin to a minimum number of middle aged (40-80 y. age) tree groups. Such clumps of vigorous trees with high growth rates, heliotropism and plasticity carry certain risks of spoiling the target regular-unevenaged stand structure. Factors of significance are discussed by determining the rotation age, size of gaps opened in the stand canopy, selection cutting cycle, a regularuneven- aged stand structure design and the minimum area that enables realisation of full selection system cycle. Definitions and determination of selection system elements in their mutual connections are presented in consecutive steps when designing a particular application of group selection system for exemplary pure stand of common beech (Fagus sylvatica L.). By the proposed group selection system modification the amount of combinations of various factors having impact upon processes in the tree groups are diminished compared to that by random spatial arrangement of the gaps over the stand area. Silvicultural activities aimed to maintain a stable unevenaged stand structures are thus getting more predictable, easier to schedule and efficient." Numéro de notice : IFN_5803 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : sans En ligne : http://www.editurasilvica.ro/afr/52/1/14_Efremov.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73515
in Annals of forest research > vol 52 n° 1 (January 2009) . - p. 143-150[article]Documents numériques
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