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Bilan de carbone et croissance du hêtre (Fagus sylvatica L.) en conditions naturelles

Abstract : This work had as first objective the analysis of CO2 assimilation and growth of a forest species (Fagus sylvatica L.) in relation with environmental conditions and tree crown class. Measurements (growth and leaf gas exchange) were performed weekly in a 30-year-old beech stand during three growing seasons on five sample trees of different crown classes (dominant, codominant and intermediate trees). Radial increment in different compartments (stem, branches, roots) was measured continuously or estimated by the use of allometric relationships. Clear differences of growth and carbon allocation were found in relation with crown class. Theses differences can be explained notably by light availability that determines assimilation and growth capacities. A second aim was to calculate the net carbon balance at daily scale and at tree level by difference between inputs (C02 assimilation) and outputs of carbon (growth and respiration). Scaling photosynthesis from leaf to crown and to tree level was done using the light response of assimilation and spatial repartition between sun and shade leaves for each tree. In addition to within-tree growth costs, outputs of carbon included an estimation of respiration (maintenance and grovvth). This approach provided a coherent estimate of carbon fluxes dynamics within tree during the growing season.
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Submitted on : Thursday, March 29, 2018 - 10:41:01 AM
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  • HAL Id : tel-01746599, version 1



Stéphanie Lebaube. Bilan de carbone et croissance du hêtre (Fagus sylvatica L.) en conditions naturelles. Biologie végétale. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10189⟩. ⟨tel-01746599⟩



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