Heavy Metal combined Pollution in Soil and Hyperaccumulating Performance of Local Plant in Hunan Yueyang Lead-zinc ore

The local plants and soil around Yueyang lead-zinc ore of Hunan and Yintan tailings were investigated in this research. The results show that the soil of mining area has been seriously polluted by combined heavy metal,and the pollution of lead,zinc and copper in this area is the most serious. Lead content in this soil is about 53 times more than standard value of soil,and zinc content is 46 times more than standard value of soil. Eight kinds of local plants have strong tolerance to combined heavy metal. The enrichment coefficient of Pb and Zn in Miscanthus floridulus(Labill.) Warb. and Dandelion is greater than 1,Pb content in the root of Miscanthus floridulus(Labill.) Warb. is as high as 702. 6 mg/kg,the transfer coefficient of Zn in Miscanthus floridulus(Labill.) Warb. is also greater than 1. Although this plant has not reached the critical standard of hyperaccumulators(1000 mg/kg),their enrichment ability for composite heavy metals is more excellent than normal plant of clean area. During the process of long-term domestication in the mining area, these plants have gained the basic characteristics of hyperaccumulators. All these plants make a contribution to restore the heavy metal combined pollution in this mining area.