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Acquisition et utilisation du phosphore par les plantules ligneuses forestières associées à des endomycorhizes : comparaison de deux espèces de forêt tropicale humide de Guyane française et impact du niveau d'éclairement

Abstract : Phosphorus (P) is an essential nutrient for plant growth. In tropical rainforest, P is thought to be a limiting factor for primary production. Plant can establish mycorrhiza, symbiosis between fungus (bringing nutrient) and plant (bringing carbon (C)). The first objective of this work was to study the dependency (P acquisition) and sensitivity (growth) of Dicorynia guianensis and Eperua falcata (two Ceasalpiniaceae) to mycorrhiza. At seedling stage, both species were dependant but only D. guianensis was sensitive. Both species stocked P in case of elevated soil P rates. The second objective was to study competition for C between plant and fungus for D. guianensis. At high irradiance, mycorhization increased P acquisition and growth. At low irradiance, fungi colonised roots but were unable to absorb P. At this irradiance, mycorhization did not improved C acquisition and had a negative effect on plant growth.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0036_GRANDCOURT.pdf
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https://hal.univ-lorraine.fr/tel-01746784
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Submitted on : Thursday, March 29, 2018 - 10:44:47 AM
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  • HAL Id : tel-01746784, version 1

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Agnès de Grandcourt. Acquisition et utilisation du phosphore par les plantules ligneuses forestières associées à des endomycorhizes : comparaison de deux espèces de forêt tropicale humide de Guyane française et impact du niveau d'éclairement. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10036⟩. ⟨tel-01746784⟩

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