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Heavy Metals Absorption and Distribution by Salix chaenomeloides Settled Naturally on the Copper Tailings
Pages: 1771-1777
Year: Issue:  9
Journal: Agro-Environmental Protection

Keyword:  copper tailingsSalix chaenomeloidesheavy metalsconcentration coefficient;
Abstract: Absorbing,transferring and distribution difference in xylem,bark and leaves of the heavy metal Cd,Pb,Zn and Cu for Salix chaenomeloides,settled naturally on a wasteland of Yueshan copper tailings,Anqing City,Anhui Province,were studied in this paper.The results showed that different organs of S.chaenomeloides absorbed Cd,Pb,Zn and Cu in different ways and these metals were distributed in different parts at different contents.The Cd content was the highest in the root bark,1 438.919 μg·kg-1;and was the lowest in the stem xylem,228.065 μg·kg-1.The Pb content in the root xylem was the highest,4 010.225 μg·kg-1,while it was the lowest in the root bark,272.312 μg·kg-1.The Zn content was the highest in the stem bark,137.563 mg·kg-1,and was the lowest in the stem xylem,11.554 mg·kg-1.The Cu content in the stem bark was the highest,36.024 mg·kg-1;and was the lowest in the stem xylem,only 19.786 mg·kg-1.The concerntration coefficient order of S.chaenomeloides absorbs different heavy metals was Cd> Zn> Cu> Pb.The Cd content in leaves showed significantly positive correlation with the contents of Pb,Zn and Cu in the copper tailings(P<0.05),and the Zn content in leaves showed extremely significant positive correlation with the total nitrogen content in the soil(P<0.01),but the contents of Pb and Cu in S.chaenomeloides were not significantly correlated to their contents in the tailings.It indicated that S.chaenomeloides could enrich soil heavy metals Cd.Therefore,S.chaenomeloides could be used to remediate the soil contaminated by the heavy metal Cd.
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