垃圾填埋场渗滤液灌溉后重金属的生态效应

盆栽试验结果表明，经l年的渗滤液浇灌后，土壤中重金属的积累量未超过国标允许值，原液浇灌的土壤酶活性受到抑制，其他处理的土壤酶活性呈现不同程度的增强.豆科树种（台湾相思和海南红豆）对重金属的吸收积累明显强于非豆科树种（桃形杧果、人面子、美人蕉、尖叶杜英），对Cu、Zn的吸收也强于草本植物香根草，狗牙根、美人蕉和膨蜞菊，但对Pb、Cd的吸收则次之，不同植物对渗滤液的耐性差别明显，台湾相思、海南红豆、香根草、狗牙根和蟛蜞菊对渗滤液有较强的耐性，对渗滤液污染的土壤有较好的净化修复能力，适合作为垃圾填埋场植被重建材料.

Heavy metal

The results of pot culture experiment showed that after one year landfill site leachate irrigation the accumulations of four heavy metals (Cu, Zn Pb and Cd) in the irrigated soil did not exceed the allowable values of national standard. The activities of soil enzymes had been elevated in different degrees irrigation, but raw leachate irrigation exerted harmful effect on it. The leguminous species (A. confusa and O. pinnata) could absorbed obviously more heavy metals than non-leguminous species; its absorption of Cu and Zn was stronger than that of herbaceous species (V. zizanioides, C. dactylon, C. indica and W. chinensis), while that of Pb and Cd was weaker. The endurance of different plant to the leachate is different obviously. The leguminous and the herbaceous species mentioned above except C. indica are more enduring with better purifying ability of leachate pollution. Thus, these species are suitable as materials for reestablishing vegetition on the landfill site.