Hyperaccumulative characteristics of some weeds distributed round a Pb-Zn mining site
Wei Shuhe Zhou Qixing Wang Xin Cao Wei (Key laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016; Graduate School of Chinese Academy of Sciences, Beijing 100039)
Accumulative characteristics of heavy metals ( Cd, Pb, Cu and Zn) in 31 weed species belonging to 17 families which survived in a Pb.Zn mining site were systematically examined. The results showed that the bioaccu-mulation coefficient in the above-ground of Kalimeris integrifolia , Taraxacum mongolicum, and Bidens bipinnata was 1 respectively, and the concentration of Cd in above-ground was all higher than that in roots, which possessed basic characteristics of hyperaccumulators. Thus it is possible to screen out hyperaccumulators from weed species.