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Geoderma 149 (2009) 217-223

Interactions between metals and soil organic matter in various particle size fractions of soil contaminated with waste water.

Katell Quenea 1, Isabelle Lamy 2, Peter Winterton 3, Alain Bermond 4, C. Dumat 5

(25/01/2009)

Only scarce field studies concern the consequences of natural soil organic matter (SOM) and metal interactions on SOM dynamics in soils. We investigated the interactions of four metals (Pb, Zn, Cu and Cd) with the SOM associated to five different size fractions (between 2000 µm and <2 µm) of a sandy top soil contaminated by waste water. Metal, organic carbon and nitrogen concentrations were measured and chemical extractions (with Na4P2O7 and EDTA) were also performed to assess the variations of SOM-metal interactions irrespective of the size fraction. In addition, as in that selected contaminated site, maize (C4 plant), replaced C3 crops 15 years ago, natural isotopic 13C labelling gave new insights into SOM turnover. First, the results suggest that metals influence the SOM dynamics in that sandy soil: a C3 "old carbon" enrichment was observed in the small or clay size fractions, while the "new" C4 carbon associated with sandy soil particles presents a rapid turnover. Metal accumulation in the clay fraction is attributed to particulate organic matter (poorly associated) and SOM decay which overtime accumulated metals and eventually these metal-SOM associations prevent the biological decomposition of such carbon pools. Moreover, the 13C signals, C/N ratios and results from chemical extractions clearly showed differences in the origin, nature and reactivity of the SOM as a function of the size fraction with consequences on the metal behaviour. Differences were observed between metals studied: Zn seems to be mainly bound to SOM associated with clay particles, while Pb seems to prefer to interact directly with the mineral surfaces versus the SOM.

1 :	Biogéochimie et écologie des milieux continentaux (Bioemco)
	CNRS : UMR7618 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris-Est Créteil Val-de-Marne (UPEC) – Ecole normale supérieure de Paris - ENS Paris – Institut de recherche pour le développement [IRD] – AgroParisTech – Institut national de la recherche agronomique (INRA) : UMR1122
2 :	Unité de Science du Sol
	Institut national de la recherche agronomique (INRA)
3 :	Dynamique de la biodiversité et fonctionnement des écosystèmes continentaux (DBFEC)
	CNRS : GDR2828 – Institut national de la recherche agronomique (INRA) – Institut de recherche pour le développement [IRD] – Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris XI - Paris Sud – Université Claude Bernard - Lyon I – Université Joseph Fourier - Grenoble I – Université Montpellier I – Université Montpellier II - Sciences et techniques – Université Paul Valéry - Montpellier III – Ecole normale supérieure de Paris - ENS Paris – Ecole Nationale du Génie Rural des Eaux et Forêts
4 :	Environnement et Grandes Cultures (EGC)
	Institut national de la recherche agronomique (INRA) : UMR1091 – AgroParisTech
5 :	Laboratoire Ecologie Fonctionnelle et Environnement (EcoLab)
	PRES Université de Toulouse – Institut National Polytechnique de Toulouse - INPT – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées – CNRS : UMR5245

domaine

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Sciences de l'Homme et Société/Etudes de l'environnement

mots-clés : soil organic matter turnover – stable isotopic carbon ratio – trace metal behaviour – size fractionation – waste water

bioemco-00396336, version 1

http://hal-bioemco.ccsd.cnrs.fr/bioemco-00396336

oai:hal-bioemco.ccsd.cnrs.fr:bioemco-00396336

Contributeur : Katell Quenea <>

Soumis le : Mercredi 17 Juin 2009, 16:15:33

Dernière modification le : Lundi 16 Avril 2012, 09:15:36