Diversité interspécifique de l'efficience d'utilisation de l'eau des acacias sahéliens et australiens

Abstract : The main objective of this work was to compare water use efficiency (WUE) among various Australian and Sahelian acacia species using isotope discrimination at leaf level ([delta]13Cf) and various methods of measurement. Acacia species exhibited a large inter-specific variability of [delta]13Cf. This variability was confirmed by direct leaf gas exchange measurements (intrinsic water use efficiency, Wi) and by measurement at the whole plant level (transpiration efficiency, TE). A large interspecific variability of leaf traits (stomatal density DS, leaf nitrogen concentration %N, specific leaf area SLA, net CO2 assimilation of the saturation Asat, stomatal conductance for water vapor of the saturation gssat) and growth characteristics (root shoot biomass ratio R/S) has also been reported. WUE was controlled for gssat. The hypothesis that the species from arid areas exhibit higher WUE was not confirmed. In contrast, the species from semi-wet area exhibited a higher WUE than those from semi-arid and arid zones
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Nianguiri Moussa Konate. Diversité interspécifique de l'efficience d'utilisation de l'eau des acacias sahéliens et australiens. Biologie végétale. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10044⟩. ⟨tel-01748555⟩

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