浙江省铅锌矿区土壤重金属污染及重金属超富集植物筛选

Study of soil heavy metal pollution and screen of heavy metal hyper-accumulation plants in lead-zinc mine areas of Zhejiang Province

分别以浙江省境内富阳某铅锌矿区(FY)、淳安某铅锌矿区(CA)、诸暨某铅锌矿区(ZJ)和三门某铅锌矿区(SM)为研究对象,对铅锌矿区土壤的Zn、Pb、Cu、Cd 4种重金属污染状况及其上生长的16种优势草本植物的重金属富集特征进行了研究。结果表明,FY、ZJ和SM的土壤均受Cd、Zn、Pb重度污染,而CA的土壤受Cd、Zn、Cu重度污染。4个铅锌矿区的Cd污染最严重,其次为Zn污染。CA的伴矿景天(Sedum plumbizincicola)和ZJ的紫花香薷(Elsholtzia argyi)地上部Cd质量浓度分别为571.2、218.7mg/kg,且富集系数和转运系数均超过1,达到了Cd超富集植物的标准,表明这两种植物均可能是Cd超富集植物。

The concentrations of Zn,Pb,Cu and Cd in soils and 16 kinds of dominant herbaceous plants collected from 4 lead-zinc mine areas of Zhejiang Province were investigated,including a lead-zinc mine from Fuyang （FY）, a lead-zinc mine from Chun＇an （CA）,a lead-zinc mine from Zhuji （ZJ） and a lead-zinc mine from Sanmen （SM）. The results showed that soils from FY,ZJ and SM were heavily polluted by Zn,Pb and Cd,and soil from CA was heavily polluted by Zn,Cu and Cd. Cd pollution was most serious in 4 lead-zinc mine areas,foUowed by Zn pollution. Shoot Cd mass concentrations of Sedum plumbfzincfcola from CA and Elsholtzia argyi from ZJ were 571.2 and 218.7 mg/kg, respectively. Bioconcentration factors and translocation factors of both plants exceeded 1,meeting the screen standard of Cd hyper-accumulation plants. Therefore, Sedum plumbfzincfcola and Elsholtzia argyi might be Cd hyper-accu- mulation plants.