Heavy Metals Accumulation in Four Grasses Planted on Copper Mine Acid Waste Rock Dump
A field experiment was conducted to compare the growth and heavy metal accumulation of Neyraudia reynaudian, Vetiveria zizanioide, Paspalum notatum and alfalfa on the waste rock dump, soil reconstructed by 10 cm soil covering on 20 cm limestone amendment layer, 10 cm soil covering on 20cm coal fly ash amendment layer, 10 cm soil covering on 20cm red mud amendment layer and 10cm soil covering on waste rock directly without any amendment layer. The results indicated that biomass of soil reconstructed with alkaline substances layer was about 3 times higher than that without any amendment layer. Neyraudia reynaudian was a typical heavy metal excluder, because the concentrations in shoots of the plants were the lowest among the four plants tested. The most of metal accumulated in Neyraudia reynaudian distributed in its root, and transportation of metal in this plant from root to shoot was restricted. Neyraudia reynaudian, accumulated a relatively low level of heavy metals in their shoots and roots, was more suitable for phytostabilization of toxic mined lands than the other plants tested. Therefore, Neyraudia reynaudian was regarded as lower ecological risk species used for phytoremediation (for both phytostabilization and phytoextraction) of acid waste rock dump, while alfalfa as higher ecological risk species.
acid waste rock dump heavy metals soil reconstruction phytoremediation ecological risk
ZHU Yibin ZHOU Lianbi LIN Hai GAO Wenqian PAN Bin ZHAN Yuhong
School of Civil and Environment Engineering,University of Science and Technology Beijing,Beijing 100 Department of Environmental Engineering,Beijing General Research Institute of Mining & Metallurgy,Be Dexing Copper Mine,Jiangxi Copper Company Limited,Dexing 334224,Jiangxi,China
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1996-2000
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）