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Study on Heavy Metal Absorption and Enrichment Characteristics by 8 Plants Species Settled Naturally in Xiangsigu Copper Tailings
Author(s): 
Pages: 886-891
Year: Issue:  5
Journal: Ecology and Environmental Sciences

Keyword:  copper mine tailingsplants settled naturallyheavy metalenrichment characteristics;
Abstract: Through field investigation and laboratory experiments, heavy metals absorption and enrichment characteristics of 8 plants species settled naturally in Xiangsigu copper tailings were analyzed in Tongling city, Anhui province, which provided theoretical basis for the revegetation of copper tailings and phytoremediation plant of heavy metal contaminated soil. The eight plant species were M. sinensis, R. japonicas, P. multiflorum, I. denticulate, A. hispidus, E. annuus, C. canadensis, R. lambertianus. The results showed that the contents of total nitrogen, total phosphorus, available nitrogen, available phosphorus, available potassium, organic and other nutrients were lower than that of control soil significantly(P<0.01). The Cu concentrations of Xiangsigu copper tailings reached up to 2 224.17 mg·kg-1. Zn and Cd concentrations were significantly higher than that of control soil(P<0.01). Pb concentrations were significantly higher than control soil(P<0.05). Low nutrients, excessive concentrations of heavy metal Cu were major factors inhibiting plant settled on the copper tailings. Through analysis for heavy metal contents of 8 plants species different parts, heavy metals absorption of 8 plants species mainly concentrated in the roots. Among 8 plant species, the contents above the ground for heavy metals in M. sinensis were the highest, and contents of Cu, Pb, Zn and Cd were 314.487, 85.710, 199.681, 2.650 mg·kg-1 respectively. By Analyzing of transfer coefficient and enrichment coefficient, Cu, Pb and Cd transfer coefficient in the body of M. sinensis were highest, being 0.701, 1.797 and 1.432 respectively. Transfer coefficient of R. japonicus for Zn is the strongest, being 1.743. Enrichment coefficient of M. sinensis above the ground for Cu, Pb, Zn and Cd were the highest, being 0.141, 0.408, 0.239, 0.240 respectively. Enrichment coefficient of M. sinensis on the under ground parts for Cu, Cd were the highest, being 0.202, 0.168. Therefore, M. sinensis could be used not only as a pioneer plant in the revegetation of copper tailings but also as a phytoremediation plant of heavy metal contaminated soils.
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