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Seed dispersal, microsites or competition : what drives gap regeneration in an old-growth forest? An application of spatial point process modelling / Georg Gratzer in Forests, vol 9 n° 5 (May 2018)  

Public [article]  inForests > vol 9 n° 5 (May 2018) Titre : Seed dispersal, microsites or competition : what drives gap regeneration in an old-growth forest? An application of spatial point process modelling Type de document : Article/Communication Auteurs : Georg Gratzer, Auteur ; Rasmus Plenge Waagepetersen, Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] croissance végétale [Termes IGN] dynamique de la végétation [Termes IGN] forêt ancienne [Termes IGN] modèle de croissance végétale [Termes IGN] modèle de simulation [Termes IGN] processus ponctuel [Termes IGN] régénération (sylviculture) Résumé : (Auteur) The spatial structure of trees is a template for forest dynamics and the outcome of a variety of processes in ecosystems. Identifying the contribution and magnitude of the different drivers is an age-old task in plant ecology. Recently, the modelling of a spatial point process was used to identify factors driving the spatial distribution of trees at stand scales. Processes driving the coexistence of trees, however, frequently unfold within gaps and questions on the role of resource heterogeneity within-gaps have become central issues in community ecology. We tested the applicability of a spatial point process modelling approach for quantifying the effects of seed dispersal, within gap light environment, microsite heterogeneity, and competition on the generation of within gap spatial structure of small tree seedlings in a temperate, old growth, mixed-species forest. By fitting a non-homogeneous Neyman–Scott point process model, we could disentangle the role of seed dispersal from niche partitioning for within gap tree establishment and did not detect seed densities as a factor explaining the clustering of small trees. We found only a very weak indication for partitioning of within gap light among the three species and detected a clear niche segregation of Picea abies (L.) Karst. on nurse logs. The other two dominating species, Abies alba Mill. and Fagus sylvatica L., did not show signs of within gap segregation. Numéro de notice : A2018-486 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/f9050230 Date de publication en ligne : 27/04/2018 En ligne : https://doi.org/10.3390/f9050230 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91222 [article]