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    STUDIA GEOLOGIA - Ediţia nr.1 din 2007  
         
  Articol:   EFFECTS OF WATER STRESS AND GIRDLING ON INTRA-ANNUAL δ13C OF TREE-RING: A FUNCTIONAL APPROACH.

Autori:  FLORENCE MAUNOURY, CHANTAL FRESNEAU, THOMAS EGLIN, CHRISTOPHE FRANÇOIS , DANIEL BERVEILLER, LAURENT VANBOSTAL, CAROLINE LELARGE, CLAIRE DAMESIN. 		 
       
         
  Rezumat:  Growth and δ13C of tree rings are often used to understand tree functioning during its life and its responses to environmental factors. The model used to interpret δ13C signals is the model of Farquhar (1982), which is based on leaf discrimination during photosynthesis. Recent studies have shown the existence of post-photosynthetic fractionations (e.g., during respiration). Our objective is to study the link between leaf and ring, in term of the δ13C signal. More precisely, we would like to understand how an environmental constraint (like water stress) or an artificial stopping of C allocation from leaves to ring, could have an impact on the current year ring δ13C, by a change in quality and quantity of leaf assimilates available for ring growth. We will examine the impact of these two constraints on the ring growth, the intra-annual pattern of ring δ13C and the trunk respiration (i.e., CO2 efflux and δ13C).  
         
     
         
         
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