Anthropogenic lead distribution in soils under arable land and permanent grassland estimated by Pb isotopic compositions
2008
Fernandez, Christelle | Monna, Fabrice | Labanowski, Jérôme | Loubet, Michel | van Oort, Folkert, F. | Unité de recherche Science du Sol (USS) ; Institut National de la Recherche Agronomique (INRA) | Centre des Sciences de la Terre ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon | Laboratoire de chimie et microbiologie de l'eau [UMR 6008] (LCME [Poitiers]) ; Université de Poitiers = University of Poitiers (UP)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire de Géochimie ; Université Toulouse - Jean Jaurès (UT2J) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)
International audience
Afficher plus [+] Moins [-]anglais. The role of land use on fate of metals in soils is poorly understood. In this work, we studied the incorporation of lead in two neighboring soils with comparable pedogenesis but under long-term different agricultural management. Distributions of anthropogenic Pb were assessed from concentrations and isotopic compositions determined on bulk horizon samples, systematical 5–10 cm increment samples, and on 24-h EDTA extracts. Minor amounts of anthropogenic lead were detected until 1-m depth under permanent grassland, linked to high earthworm activity. In arable land, exogenous Pb predominantly accumulated at depths <60 cm. Although the proximity between the two sites ensured comparable exposition regarding atmospheric Pb deposition, the isotopic compositions clearly showed the influence of an unidentified component for the cultivated soil. This work highlights the need for exhaustive information on historical human activities in such anthropized agrosystems when fate of metal pollution is considered.
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