Rôle des activités lombriciennes sur la redistribution des éléments traces métalliques issus de boue de station d'épuration dans un sol agricole

Abstract : The aim of this research work deals with the role of Lumbricids activities in (1) infiltrating water quality and especially its content in trace metals (Cu, Cd, Pb and Zn) and (2) in the redistribution of trace metals within casts and burrow linings compared to the surrounding soil. In order to detremine the impact of earthworms activities on trace metals “dynamics”, laboratoy experiment were conducted with two earthworms species Lumbricus terrestris and Nicodrilus giardi with or without sewage sludge metallic contamination. Trace metal flow via the infiltrating water increased with earthworms. Earthworms burrow constitute preferential flow path for infiltrating water resulting in the increase of trace metal flow. Burrows were found to be particular soil microsites where physico-chemical processes and microbial activities were emphaysez so that trace metal speciation may be changed. However during our experiment no physico-chemical processes were implicated in trace metals flow. Two complementary approch were used to determine trace metals distribution in the microsites: chemical extractions and particle size fractionation. Theses two techniques pointed at trace metal redistribution within the microsites, implying a change in trace metal speciation. Two types of redistribution were identified: • An “alimentary” redistribution due to a selective behavior of earthworms • A “Physico-chemical” redistribution due to the several processes taking place in earthworms microsites.
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Submitted on : Wednesday, November 17, 2004 - 9:54:51 AM
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  • HAL Id : tel-00007433, version 1

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Frédérique Ablain. Rôle des activités lombriciennes sur la redistribution des éléments traces métalliques issus de boue de station d'épuration dans un sol agricole. Ecologie, Environnement. Université Rennes 1, 2002. Français. ⟨tel-00007433⟩

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