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Master thesis

Réponse de la photosynthèse du hêtre (Fagus sylvatica) à la sécheresse et à la défoliation

Abstract : Increases in the frequency and duration of droughts, is one of the consequences of the climate change. Drought affected forest production and it is the basis of many forest dieback reported last decade. Forest tress can die of both hydraulic failure and carbon starvation. The main objective of this work was to study the impact of drought and defoliation on the carbon balance of young beech. We measured net assimilation at tree scale and at leaf scale. We used MAESTRA model to simulate light absorption for tress. We found lower carbon balance in trees under intense drought and for those who were defoliated than control tress. Water deficit decreased photosynthetic activity of leaves as well as their area. Implicitly, it has a negative impact of the light absorption of trees. Leaf photosynthesis in defoliated trees was higher than control trees. But their low carbon balance is explained by their low leaf area.
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https://hal.univ-lorraine.fr/hal-01828247
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Steevensen Alcius. Réponse de la photosynthèse du hêtre (Fagus sylvatica) à la sécheresse et à la défoliation. Sciences de l'environnement. 2015. ⟨hal-01828247⟩

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