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Processus d'agrégation dans un technosol : contribution des constituants anthropiques (oxydes de fer, laitiers, HAP, ETM) à la formation des associations organo-minérales

Abstract : The increasing number of sites affected by the presence of technogenic materials makes necessary the study of (bio)functioning of Technosols, developed there. A technogenic material, resulting from an old industrial coking plant and presenting a multipollution of HAP and metals was laid out in lysimetric pieces for an in situ study (site of Homécourt, www.gisfi.fr). The morphological and analytical characterization at different scales of initial material enabled us to define, in analogy with standard pedological classification, the presence (1) of primary constituents such as quartz, iron oxides, gypsum and anthropic organic matters, (2) of technogenic pseudo-sands, like slags, (3) of water-stable technogenic aggregates (12% of the soil mass), generated through the aggregating role of the fine fraction (0-20 µm). Anthropic organic matter and ETM (Zn Pb, Ba) contribute to the formation of these organo-mineral associations. This material of anthropic origin, while it is specific, contains mineral and organic components able to aggregate and is thus, as well as natural soils, able to develop under the influence of pedogenic factors to form a Technosol. If the two years of experimentation were not sufficient to highlight a modification of the structural stability of this young Technosol, the results underline there the impact of the colonizing plants and the rhizospheric microflora on the formation of organo-mineral associations. The biological activity is thus a key factor of evolution of these soils
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Marie-France Monsérié. Processus d'agrégation dans un technosol : contribution des constituants anthropiques (oxydes de fer, laitiers, HAP, ETM) à la formation des associations organo-minérales. Sciences agricoles. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL065N⟩. ⟨tel-01748914⟩

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