Analyse de l'efficience d'utilisation de l'eau des chênes pédonculé (Quercus robur L.) et sessile (Quercus petraea (Matt.) Liebl.) : relation avec les dépérissements des chênaies

Abstract : The two sympatric European oak species Quercus robur and Q. petraea display distinct ecological requirements and drought sensitivities. Intrinsic water-use efficiency (WUE[index int]) was studied on the basis of both measurements of instantaneous gas exchange and carbon isotopic composition of plant tissue ([delta]13C). Retrospective analysis of [delta ]13C in wood cellulose of adult trees from the two species growing in mixed stands showed a time-stable interspecific difference. Gas exchange measurements performed on 2-year old seedlings grown in "common garden" confirmed the higher WUE[index int] of Q. petraea than Q. robur, mainly due to stomatal conductance variations between the two species. A genetic basis to these interspecific differences was suggested. The results provided new insights in the understanding of the ecology of these species. However, no clear relationships were observed between tree-ring growth or [delta]13C and sensitivity to drought-induced decline. The relationship between WUE[index int] and drought resistance is discussed.
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Stéphane Ponton. Analyse de l'efficience d'utilisation de l'eau des chênes pédonculé (Quercus robur L.) et sessile (Quercus petraea (Matt.) Liebl.) : relation avec les dépérissements des chênaies. Biologie végétale. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10184⟩. ⟨tel-01748642⟩

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