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Ecologie du hêtre (Fagus sylvatica L.) en marge sud-ouest de son aire de distribution

Abstract : In Europe, climatic series show a global warming and an increase in frequency of summer drought. Climate is considered to be the main factor determining forest species distribution. Consequently, the zones where species are more prone to disappear in Europe are the southern margins, where current climatic conditions are the warmest and the driest of their range. So, an improved understanding of growth and health of forest tree species in these border areas becomes more than a challenge, a necessity. European beech (Fagus sylvatica), a major tree species of European forests with a broad ecological niche, represents a model species for such studies. Recent works based on statistical modelling suggested a sharp reduction of its distribution towards its core range, under future climates. Current presence of the species in lowlands strongly decreases in the south-west of France which corresponds to its southern margin in Western Europe. In this zone, spots of beech trees are however still observed in inventory databases, few stand declines have been noted and the modelled probability of presence of the species under current climate is not null. We therefore thought to redefine the distribution range concept using various descriptors and to characterize climatic, microclimatic and soil constraints that control the niche of this species
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Daniel E Silva. Ecologie du hêtre (Fagus sylvatica L.) en marge sud-ouest de son aire de distribution. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10136⟩. ⟨tel-01746152⟩

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