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Principe de facilitation appliqué à la restauration écologique de sites miniers dégradés : suivi des communautés ectomycorhiziennes au cours de successions végétales assistée par Acacia spirorbis

Abstract : Acacia spirorbis is an endemic species of New Caledonia, capable of forming symbiosis with soil micro-organisms, including ectomycorrhizae and developing on a very wide variety of soils. In order to test the capacities of this species to initiate a process of ecological restoration of ecosystems degraded by mining activities, a nursery trial and three field trials were setted up. These trials highlight the ability of A. spirorbis to play, through facilitation, a nurse plant role for target species of the genus Tristaniopsis in the frame of ecological restoration processes. Thus, we first described the diversity of the ectomycorrhizal fungi associated with A. spirorbis and then we described their ability to associate in the field with Tristaniopsis thanks to the initial presence of A. spirorbis. The capacities of A. spirorbis to facilitate the implantation of other target species by improving their survival, growth and allowing them to access to a diversified range of ectomycorrhizal fungal partners are described. These results led to propose a technical itinerary for ecological restoration of degraded mining maquis, an itinerary based on facilitation between species using A. spirorbis as a nurse plant.
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Anne Houlès. Principe de facilitation appliqué à la restauration écologique de sites miniers dégradés : suivi des communautés ectomycorhiziennes au cours de successions végétales assistée par Acacia spirorbis. Biologie végétale. Université Montpellier, 2017. Français. ⟨NNT : 2017MONTT158⟩. ⟨tel-01735771⟩

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