土壤重金属污染植物修复的紫云英调控研究

有机调控是植物修复土壤重金属污染的有效措施之一,为研究绿肥--紫云英的调控效果,实验于2004年3-12月选取江西省贵溪市冶炼厂周边受重金属污染的大田进行研究.结果表明,紫云英处理显著降低土壤重金属浓度和土壤综合污染指数,下降幅度与CK比呈极显著差异:除土壤Zn、Cd浓度和土壤重金属多因子综合污染指数的下降幅度显著低于有机试剂处理,其他与有机试剂处理均无显著差异;紫云英处理与“紫云英 有机试剂“的交互作用处理相比,土壤重金属浓度和土壤综合污染指数的下降幅度无显著差异.海洲香薷对Cu、Zn、Pb、Cd都有不同程度的富集,富集系数评价表明,紫云英处理、有机试剂处理及其交互作用处理与CK相比,海洲香薷对重金属元素的富集有显著提高,紫云英处理对植物富集重金属的影响介于有机试剂处理与其交互作用处理之间.

Effect of Astragalus siniucus L. on Phytoremediation of Heavy-Metals-Polluted Soil

Phytoremediation is an effective measure to eliminate heavy metals, contaminants from soils,, an experiment was carried out during March-Dec. 2004, on effect of a green manure crop, Chinese milk vetch (Astragalus siniucus L.) in a field of heavy metals contaminated soil in the vinicity of a smeltery in Guixi City of Jiangxi Province. Results showed that cultivation of milk vetch significantly lowered concentrations of heavy metals and soil comprehensive pollution index, and more or less the same as the treatments of organic reagents, except for effect on decreasing Zn and Cd concentrations and comprehensive heavy metal pollution index, which were not so big in scale. When compared with the treatment of milk vetch+organic reagents, the treatment of milk vetch did not differ much in heavy metal concentrations and comprehensive pollution index. Elsholtzia splendens Nakai ex F. Maekawa by A. siniucus enriches Cu, As, Pb and Cd to a varying extent. The evaluation of enrichment coefficients indicate that the plant is much higher than milk vetch and milk vetch+organic reagent in heavy metal enrichment, and the treatment of milk vetch lies in between the treatment of organic reagent and the treatment of milk vetch+organic reagent in effect on plant enrichment of heavy metals.