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Diversité fonctionnelle de la réponse à la sécheresse édaphique d'espèces feuillues en peuplement mélangé : Approches écophysiologique et isotopique

Abstract : In regard to the various functions of forests and considering the general idea that mixed stands would be more resistant and resilient to disturbances, those stands are more and more promoted than pure stands. In such a context, characterize co-occurring species behaviour and define the possible interaction between them appeared to be necessary. The main objective of this work was to characterize the functional diversity in water uptake and regulation in a young broad leaved mixed forest, particularly under drought conditions. The study was focused on (i) drought response of the species from sap flow and predawn leaf water potential measurements, (ii) water absorption through two-dimensional root distribution and labeling experiments (using deuterium and 18O) and (iii) vulnerability to cavitation of the different species and its protection through stomatal regulation. Radial growth, phenology and water use efficiency were also taken into account in this analysis. A principal component analysis highlights a spatial and temporal partitioning of water resource and underlines contrasted tree water use strategies among co-occurring species. At stand level, this functional diversity results in complementarity soil water use and facilitation mechanism (hydraulic lift) that benefits to mixed in comparison to pure forest stands.
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  • HAL Id : tel-02816908, version 2
  • PRODINRA : 40452

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Marion Zapater. Diversité fonctionnelle de la réponse à la sécheresse édaphique d'espèces feuillues en peuplement mélangé : Approches écophysiologique et isotopique. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10133⟩. ⟨tel-02816908v2⟩

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