Hétérogénéité des peuplements forestiers et production : interactions avec les traits fonctionnels des espèces

Abstract : Understanding the link between diversity ecosystem functioning has been a major topic of ecology for the last decades. When studying the relationship between diversity and productivity in tree populations and communities, size heterogeneity has often been disregarded. Our study focuses on the effect of size heterogeneity on the production of pure and mixed forest stands as wells its interactions with species’ functional traits. By using national forest inventory data, we were able to demonstrate a negative effect of size heterogeneity in both pure and mixed stands. In the latter case, we showed a positive effect of species richness as well as a positive effect of a decrease of shade tolerance with tree size, i.e. when the less tolerant species are dominant in the overstorey. We propose potential mechanisms to explain our results and discuss the consequences of such findings at larger time scale for the stability and resilience of forest stands.
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Thomas Bourdier. Hétérogénéité des peuplements forestiers et production : interactions avec les traits fonctionnels des espèces. Ecologie, Environnement. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAV050⟩. ⟨tel-01684683⟩

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