Déterminisme de la respiration de l'écosystème dans l'étude du bilan de carbone d'une hêtraie de plaine

Abstract : The aim of this thesis was to separate the components of ecosystem respiration (RECO) and to identify the main factors driving its variability. Soil respiration (RS) and its autotrophic and heterotrophic component was the main part of RECO. CO2 efflux from woody debris and leaf litter decomposition also participated significantly to RECO. Our results confirmed the predominant influence of soil temperature and water content on temporal variability of CO2 efflux. But they also showed that several other factors could influence variability (in particular spatial variability). The spatial variability of RS was related to bulk density and C/N ratio of superficial soil layer. Stand parameters (basal area, density, leaf area index) and root biomass did not explain this variability. These approaches allowed highlighting variability of RECO and its components. Limits and uncertainties of our methods are discussed.
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Jérôme Ngao. Déterminisme de la respiration de l'écosystème dans l'étude du bilan de carbone d'une hêtraie de plaine. Sciences agricoles. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10150⟩. ⟨tel-01748078⟩

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