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Effets des facteurs environnementaux sur la distribution et l'abondance des espèces végétales forestières aux échelles locales et régionales

Abstract : The objective of this PhD is to analyse and to predict the presence and abundance of understorey species locally by factors linked with stand structure (canopy openness) and according to different environments (soil-pH). Also the aim is to assess whether soil-pH, canopy openness and climate do have similar effects on species distribution, derived on one hand from presence-absence data, and on the other hand from abundance measurements. For this we used floristic and forest dendrometry inventories performed five years after canopy opening (293 gaps - northeastern France) and under closed canopy conditions (10 996 sites - France). Different spatial scales were used to asses the effect of the factors: local, regional and national scale. First we modelled the presence and abundance distributions (i) first at regional scale in relation with local canopy openness and regional soil-pH factors and (ii) secondly at national scale in relation with soil-pH and climate. At regional scale, the results indicate that the combination of a local canopy openness factor and a regional soil-pH affect the distribution of understorey species five years after canopy opening. We succeeded to quantify the optimal requirements of the most common broadleaf tree seedlings and herbaceous species along canopy openness and soil pH gradients. At national scale, our results show that the species distribution, derived from presence-absence data, indicate the ecological optimum of abundance when using climate and soil-pH gradients, however give larger geographical habitats because of overestimation of the ecological amplitude.
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https://pastel.archives-ouvertes.fr/pastel-00604628
Contributor : Rosalinde van Couwenberghe <>
Submitted on : Wednesday, June 29, 2011 - 12:35:11 PM
Last modification on : Tuesday, March 17, 2020 - 2:05:54 AM
Long-term archiving on: : Sunday, December 4, 2016 - 5:24:06 AM

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Rosalinde van Couwenberghe. Effets des facteurs environnementaux sur la distribution et l'abondance des espèces végétales forestières aux échelles locales et régionales. Ecosystèmes. AgroParisTech, 2011. Français. ⟨NNT : 2011AGPT0016⟩. ⟨pastel-00604628⟩

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