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Unsupervised classification of airborne laser scanning data to locate potential wildlife habitats for forest management planning / Jari Vauhkonen in Forestry, an international journal of forest research, vol 89 n° 4 (August 2016)
[article]
Titre : Unsupervised classification of airborne laser scanning data to locate potential wildlife habitats for forest management planning Type de document : Article/Communication Auteurs : Jari Vauhkonen, Auteur ; Joni Imponen, Auteur Année de publication : 2016 Article en page(s) : pp 350 - 363 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Aves
[Termes IGN] biodiversité végétale
[Termes IGN] classification non dirigée
[Termes IGN] couvert forestier
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] exploration de données géographiques
[Termes IGN] gestion de la vie sauvage
[Termes IGN] gestion forestière durable
[Termes IGN] habitat d'espèce
[Termes IGN] hauteur des arbres
[Termes IGN] inventaire forestier étranger (données)
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) To account for ecological objectives in forest management planning, potential habitats need to be mapped, characterized and evaluated for utility in alternative management practices. Airborne laser scanning (ALS) is increasingly used to derive predictive maps of habitat quality. Unlike ecologically driven approaches that require spatially and temporally co-located training data of the specific species, we tested whether indicative information on the habitat potential could be obtained by means of an unsupervised classification of ALS data. Based on a literature review, altogether five ALS features quantifying vegetation height, cover and diversity were expected to capture the essential variation in the habitat requirements of western capercaillie (Tetrao urogallus L.) and hazel grouse (Tetrastes bonasia L.), which are the most important game birds occurring in the studied area. The features were extracted from sparse density, leaf-off ALS data at a resolution of 256 m2 and partitioned using an unsupervised k-means algorithm. By analysing the persistence of the cluster ensemble formed by the partitioning, altogether 158 plots in 16 structural classes were assigned for field measurements to determine which real-world forest phenomena affected the clustering. The clustering was found to stratify the area mainly in terms of size-related attributes such as timber volume and basal area. The understorey, shrub and herb layers had less correspondence with the clustering, indicating that an unsupervised classification is not directly suitable for habitat mapping. The result was improved using empirical threshold values for the ALS features determined according to the plots labelled as the most potential habitats in the field measurements. This semi-supervised classification of the data indicated 4 per cent of the total forest area as suitable for the specific species, which appears a reasonable estimate of the core area of the habitats considered. Overall, the partitioning formed aggregated, stand-like spatial patterns, even though the neighbourhoods of the individual 256 m2 cells were not considered at all. The result could be further refined by spatial optimization to produce indicative maps for forest management planning with ALS as the sole data source. Numéro de notice : A2016--155 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1093/forestry/cpw011 En ligne : https://doi.org/10.1093/forestry/cpw011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85780
in Forestry, an international journal of forest research > vol 89 n° 4 (August 2016) . - pp 350 - 363[article]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)
[article]
Titre : Long-term vegetation dynamics and land-use history: Providing a baseline for conservation strategies in protected Alnus glutinosa swamp woodlands Type de document : Article/Communication Auteurs : Brith Natlandsmyr, Auteur ; Kari Loe Hjelle, Auteur Année de publication : 2016 Article en page(s) : pp 78 - 92 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Alnus glutinosa
[Termes IGN] anthropisation
[Termes IGN] biodiversité végétale
[Termes IGN] dynamique de la végétation
[Termes IGN] écosystème forestier
[Termes IGN] état de conservation
[Termes IGN] forêt ripicole
[Termes IGN] marais
[Termes IGN] Norvège
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) Alnus glutinosa (alder) swamp woodlands are in danger of disappearing in Europe and, in Norway, several habitats with alder are threatened. Knowledge about the dynamics of alder swamp woodlands is crucial for the conservation and management of this vegetation. Our studied site, Rambjøra, in western Norway encompasses the Rambjøra Landscape Protected Area. We combined information from three sources—recent alder swamp woodland ecology, vegetation history, and agricultural history—to reveal the long-term vegetation dynamics of Rambjøra in relation to land-use. Dynamic changes in the predominance of forest or semi-natural grassland over 2800 years, concurrent with varying anthropogenic disturbances are inferred. At the investigated site, alder swamp woodland developed after forest clearance and changes in the water balance. The abundance of alder swamp woodlands have varied through time, increasing with low-impact land-use and declining with intensified use or abandonment. The highest biodiversity is found in periods with grazing, hay mowing, and probably fodder and fire wood collection. This indicates that agricultural practices of moderate intensity (grazing and hay cutting) should be part of the future management in order to maintain the biodiversity and meet the objective of the protection of Rambjøra. The study demonstrates the advantages of combining vegetation surveys, pollen records, and land-use history to provide a long-term perspective on vegetation development, and in our case also as an aid when establishing conservation strategies. Our findings need to be considered in future conservation and restoration of ecosystems with alder swamp woodlands. Numéro de notice : A2016--157 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.foreco.2016.03.049 En ligne : https://doi.org/10.1016/j.foreco.2016.03.049 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86981
in Forest ecology and management > vol 372 (15 July 2016) . - pp 78 - 92[article]Documents numériques
en open access
Long-term vegetation dynamics ... - pdf éditeurAdobe Acrobat PDF Propositions d'amélioration du système de suivi de la biodiversité forestière / Guy Landmann in Les échos d'Ecofor, n° 37 (juillet 2016)
[article]
Titre : Propositions d'amélioration du système de suivi de la biodiversité forestière Type de document : Article/Communication Auteurs : Guy Landmann, Auteur Année de publication : 2016 Article en page(s) : pp 4 - 4 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Ecologie forestière
[Termes IGN] biodiversité végétaleRésumé : (Auteur) Le ministère en charge de la forêt a confié à Ecofor la coordination du projet intitulé «Propositions d’Amélioration du Système de Suivi de la bIodiversité FORestière» (Passifor). Cette mission vient de s'achever et les résultats sont disponibles dans le rapport final. Numéro de notice : A2016-534 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81677
in Les échos d'Ecofor > n° 37 (juillet 2016) . - pp 4 - 4[article]Plant community mycorrhization in temperate forests and grasslands: relations with edaphic properties and plant diversity / Maret Gerz in Journal of vegetation science, vol 27 n° 1 (January 2016)
[article]
Titre : Plant community mycorrhization in temperate forests and grasslands: relations with edaphic properties and plant diversity Type de document : Article/Communication Auteurs : Maret Gerz, Auteur ; Carlos Guillermo Bueno, Auteur ; Martin Zobel, Auteur ; Mari Moora, Auteur Année de publication : 2016 Article en page(s) : pp 89 - 99 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] azote
[Termes IGN] biodiversité végétale
[Termes IGN] ectomycorhize
[Termes IGN] Estonie
[Termes IGN] forêt tempérée
[Termes IGN] humidité du sol
[Termes IGN] prairie
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) Questions : Mycorrhizal symbiosis plays a key role in plant communities. Its prevalence in plant communities (mycorrhization) at larger spatial scales has so far been mostly qualitative, while quantitative studies incorporating the mycorrhizal traits of plant species are scarce. This study aims to: (1) determine the variation in general and arbuscular mycorrhization in temperate forests and grasslands, (2) study the effects of soil N, pH and moisture on mycorrhization, and (3) determine the relationships between mycorrhization and plant diversity.
Location : Temperate forests and grasslands in Estonia, Northern Europe.
Methods : To quantify mycorrhization we used a plant community mycorrhization index – community mean of mycorrhizal status weighted by plant species abundances. The effects of edaphic factors characterized by cumulative Ellenberg values on mycorrhization were analysed using linear mixed models, and the relationship between mycorrhization and diversity was evaluated with partial correlation and variance partitioning.
Results : General mycorrhization was higher in forests and lower in grasslands, opposite to arbuscular mycorrhization. Soil N, pH and moisture negatively impacted general mycorrhization, whereas arbuscular mycorrhization was positively affected by soil pH and negatively by soil N and moisture. Plant species richness was negatively correlated with general mycorrhization in forests, whereas arbuscular mycorrhization was positively associated with plant species richness, Shannon and Simpson indices in forests and across ecosystems.
Conclusions : Mycorrhization is highly dependent on soil conditions and related to plant diversity, showing its importance for vegetation science. The plant community mycorrhization index used in this study is a promising tool for quantifying the prevalence of mycorrhizal symbiosis along environmental gradients.Numéro de notice : A2016-361 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1111/jvs.12338 En ligne : http://dx.doi.org/10.1111/jvs.12338 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81096
in Journal of vegetation science > vol 27 n° 1 (January 2016) . - pp 89 - 99[article]Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan / Tran Van Do in Global ecology and conservation, vol 4 (July 2015)
[article]
Titre : Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan Type de document : Article/Communication Auteurs : Tran Van Do, Auteur ; Tamotsu Sato, Auteur ; Satoshi Saito, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 185 - 196 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biodiversité végétale
[Termes IGN] facteur édaphique
[Termes IGN] feuillu
[Termes IGN] gradient de pente
[Termes IGN] Japon
[Termes IGN] placette d'échantillonnage
[Termes IGN] structure d'un peuplement forestier
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) Stand structure and species diversity were studied in correspondence with micro-topographies in an old-growth forest in southwestern Japan. The study was conducted in a View the MathML source200×200m2 permanent plot, which were divided into 400 subplots using grids of View the MathML source10m×10m. Subplots were categorized to four micro-topographies as crest slope (CS), head hollow (HH), upper slope (US) and lower slope (LS), basing on slope of forest floor and plot position, and to two elevational zones as below 450 m and above 450 m. Tree censuses for all individuals with diameter at breast height (DBH) ⩾⩾ 5 cm were conducted in 2009 and 2013. The results indicated that CS had subplot means of living stems, dead stems, DBH, basal area (G), and basal area increment (▵▵G) significantly higher than that in LS. While, means of recruited stems and Shannon diversity index were significantly lower. Comparing between below and above 450 m elevational zones indicated the significantly higher parameters of stand structure and species diversity in above 450 m elevational zone. The differences of edaphic conditions led to difference of density of living stems, species density, DBH, G, and ▵▵G among micro-topographies. Therefore, crest slope, upper slope, and higher elevational zones should be encouraged for the purposes of carbon accumulation and storage. While, the lower elevational zones should be used for the purposes of species diversity conservation. Numéro de notice : A2015--047 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1016/j.gecco.2015.06.010 En ligne : http://dx.doi.org/10.1016/j.gecco.2015.06.010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82114
in Global ecology and conservation > vol 4 (July 2015) . - pp 185 - 196[article]PASSIFOR, Propositions d'Amélioration du Système de Suivi de la biodiversité Forestière [rapport final] / Guy Landmann (2015)PermalinkConnaissance de la biodiversité végétale / Jan-Bernard Bouzillé (2014)PermalinkSuivi national de la biodiversité forestière : état des lieux, pistes d’amélioration / Marion Gosselin in Revue forestière française, vol 64 n° 5 (Septembre - octobre 2012)PermalinkConserver la biodiversité intra-spécifique des arbres forestiers en France et en Europe / Eric Collin in Sciences, eaux & territoires, n° 3 ([22/10/2010])PermalinkTowards practices favourable to plant diversity in hybrid poplar plantations / Frédéric Archaux in Forest ecology and management, vol 259 n° 12 ([25/05/2010])PermalinkIntegrating functional diversity into tropical forest plantation designs to study ecosystem processes / Christopher Baraloto in Annals of Forest Science, vol 67 n° 3 (2010)PermalinkRelevés floristiques pour le suivi de la biodiversité végétale des écosystèmes forestiers : éléments de réflexion pour faire les bons choix / Richard Chevalier in Revue forestière française, vol 62 n° 2 (mars - avril 2010)PermalinkExpertise écologique d’un peuplement forestier : étude de la complémentarité de deux indicateurs de biodiversité / Mathilde Redon in Revue forestière française, vol 61 n° 6 (novembre - décembre 2009)PermalinkL’indice de biodiversité potentielle (ibp) : une méthode simple et rapide pour évaluer la biodiversité potentielle des peuplements forestiers / Laurent Larrieu in Revue forestière française, vol 60 n° 6 (novembre - décembre 2008)PermalinkEffects of selective thinning on growth and development of beech (Fagus sylvatica L.) forest stands in south-eastern Slovenia / Andrej Boncina in Annals of Forest Science, vol 64 n° 1 (January 2007)Permalink