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Régulation des échanges hydriques de jeunes plants de différentes espèces forestières feuillues et résineuses : effet de la contrainte hydrique, rôle du substrat et origine de la régulation stomatique

Abstract : This work had as first objective the analysis of growth and water relations of three forest species (Quercus petraea, Pinus pinaster and Betula pendula), in relation with soil type, under optimal and water stress conditions. Clear differences were observed between species. In absence of water stress, birch presented the greatest plasticity with respect to soil type. It is also characterised by higher values of stomatal conductance and hydraulic conductance than the two other species. It's stomatal regulation under water stress is belated and has only been evidenced for very lower values of soil water content (3%). In parallel, strong leaf shedding has been observed. No interaction related to the nature of substrate has been observed. A second aim was to tested, under water stress conditions, the impact of root-sourced abscisic acid (ABA) in stomatal regulation. The existence of such root signalling, based only on root ABA has not been confirmed and this, on the three forest species studied (Quercus robur, Pinus pinaster and Betula pendula). The stomatal regulatory mechanisms are certainly more complex and probably implicate a double mechanism, foliar and root mediating.
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http://docnum.univ-lorraine.fr/prive/SCD_T_1997_0262_FORT.pdf
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https://hal.univ-lorraine.fr/tel-01747381
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Submitted on : Thursday, March 29, 2018 - 10:58:16 AM
Last modification on : Monday, February 15, 2021 - 2:38:08 PM

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  • HAL Id : tel-01747381, version 1

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Christine Fort. Régulation des échanges hydriques de jeunes plants de différentes espèces forestières feuillues et résineuses : effet de la contrainte hydrique, rôle du substrat et origine de la régulation stomatique. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 1997. Français. ⟨NNT : 1997NAN10262⟩. ⟨tel-01747381⟩

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