| Heavy metals soil contamination is an important issue both in scientific research and practice. Farmland contamination of heavy metals has been much concerned due to potential human health risk. Hyperaccumulators are generally considered as phytoextraction plants because of their exceptionally large concentrations of metals in biomass without phytotoxicity symptoms. However, application of hyperaccumulator is limited by low biomass and environmental adaptability. In order to identify the potential of S.androgynus and cassava to remediation heavy metals contaminated land in Dabaoshan region. An experiment was set for S.androgynus and Manihot sp.（cassava）at a highly contaminated land by heavy metals（Cd, Cu, Pb and Zn） in this area. To determine the potential of S. androgynus and cassava to extract heavy metals, while and the potential economic income of cassava cultivation will be helpful to assess the value of reclamation seriously heavy metals contaminated soils. Results showed that S. androgynus and cassava could grow well and produce high biomass at the site. The plants extracted much heavy metal from soil due to their great biomass and relative high bioconcentration of metals in plants tissues. Comparing with hyperaccumulator Thlaspi caerulescens, S.androgynus and cassava were lower to extract Cd, but were much higher to extract Cu and Zn. In other hand, cassava was simultaneously an economic bioenergy plant easy to cultivate. The two plants could be used to reclaim heavy metals contaminated land in situ. |
