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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Earthworms'assessment in soils traces metals (Cd, Cu, Pb and Zn) alongside the Rhumel wadi (Constantine)
Auteurs :	G. Ouahrani, Auteur ; Z. Gheribi-Aoulmi, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (33(1) 2007)
Article en page(s) :	73-84
Résumé :	The lombricians as a major ecosystemic revolving plate allow observing the effective bio-availability of most chemical substances.We propose to evaluate through lombricians, the bio-risk of 4 traces elements (Cd, Cu, Pb and Zn) on long of the "oued Rhumel" river banks (Constantine town), where 99 measured out soil samples were studied. The granulometric analysis showed that 43% of the studied samples are silty-sandy; they are porous soils rich in calcareous, with alkaline average pH, a relatively weak C/N.The earthworm's density averages 285,85 +/- 37,40 ind/m(2) and their biomass 228,59 +/- 27,29 g/m(2), on the studied transect. The total trace elements contents in the studied transect is on average 5,71 +/- 0,72; 8,07 +/- 1,69; 50,82 +/- 7,53 and 101,96 +/- 18,55 ppm respectively for Cd, Cu, Pb and Zn. In the analyzed earthworms, the biocontents are 15,38 +/- 1,72; 1,86 +/- 0,55; 24,46 +/- 3,57 and 565,39 +/- 8,39 ppm respectively for CdV, CuV, PbV and ZnV (V = earthworms). The regression equations show a positive and significant correlation between the traces elements in the soil and in the studied earthworms. The ANOVA results show a very significant station effect for the 11 prospected stations. The bioaccumulation sequences obtained for this study are as follow: Zn > Cd > Pb > Cu.In addition, a canonical correlation analysis applied between the variables (CdS, CuS, PbS, ZnS) characterizing the soil, and the variables (CdV, CuV, PbV and ZnV) characterizing the earthworms, confirmed the important bioconcentration of the trace elements by the lombriciens.

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