Réhabilitation des sols pollués par les éléments traces métalliques grâce aux bactéries du sol associées à la rhizosphère de Miscanthus x giganteus

Abstract : Soil is a nonrenewable resource to maintain because of its socio-economic and environmental importance. However, (bio)industrial activities can degrade soil and cause the appearance of persistent pollution brownfields. The ability of Miscanthus x giganteus to adapt to brownfield soils polluted with heavy metals (HM), while promoting the consolidation process of bioremediation of polluants, without causing a negative impact on the environment, is studied. Soils from Lorraine region (France), very affected by past industrial activity, are used. Considering the complexity of soil-plant-microorganisms relationships, various complementary assessment tools (i.e. in vitro,mesocosm and field) are used to determine the response of each component and their interactions, and thus deduce the sustainability of the method. The culture of M. x giganteus has great potential for rehabilitation of brownfield soils having a multimetallic pollution or mixed (+PAH) with a double benefit: phytostabilisation of HM at the root level and the production of biomass reclaimable (limited transfer of HM). The plant does not alter the characteristics of the soil involved in the mobility of HM (pH, CEC) ; but changes from those related to soil fertility, toxicity (liquid fraction) and the accumulation of HM by other organisms attest to the interaction of the plant with the elements that would make them more available. Plant's activity is causing associations with soil bacteria, for which the phylopes potentially métalloresistants (Zn, Cr) seem common in soils used
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Claudia Patricia Martinez Chois. Réhabilitation des sols pollués par les éléments traces métalliques grâce aux bactéries du sol associées à la rhizosphère de Miscanthus x giganteus. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0323⟩. ⟨tel-01749402⟩

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