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Investigation of contaminated soil and plants by heavy metals in Pb-Zn mining area

SUN Jian~(1),TIE Bo-qing~(1),QIN Pu-feng~(1),ISAO Aoyama~(2),LUO Rong~(2)(1.College of Resources and Environment,Hu′nan Agricultural University,Changsha 410128,China;2.Research Institute for Bioresources,Okayama University,Kurashiki 710-0046, Japan),J.Plant Resour.& Environ.2006,15(2): 63-67  
The present condition of soil and plant contaminated by heavy metals in a non-ferrous mining site was systematically investigated.The result showed that the soil was serious lean and contaminated with a exremely high heavy metal′s concentration of Pb(764.74 mg·kg~(-1)),Cd(4.10 mg·kg~(-1)),Zn(372.75 mg·kg~(-1)) and Cu(95.57 mg·kg~(-1)) respectively due to the Pb-Zn mining tailings and mine toxic water pollution.Nine predominant plant species were found successfully settling on contaminated soil,but the contents of Pb,Zn,Cu and Cd in these plants did all not reach the critical content of hyperaccumulator.The biomass of above-ground part and ability of heavy metals up to transport of Dendranthema indicum(L.) Des Moul、Cyperus michelianus(L.) Link and Miscanthus floridulus(Labill.) Warb.ex Schum. et Laut.were higher than other plant species,and the contents of some heavy metals in stems and leaves of above-mentioned three species were higher than that in roots,which indicating that these species had certain potential ability to remediate contaminated soil.
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