重金属在土壤生态系统中的富集及毒性效应  

Enrichment and toxicity effect of heavy metals in soil ecosystem.

作　　者：王振中[1] 张友梅[1] 邓继福 李忠武[3] 

机构地区：[1]湖南师范大学资源环境科学学院,长沙410081 [2]株洲市环境监测中心,株洲412000 [3]湖南大学环境科学与工程学院,长沙410082

出　　处：《应用生态学报》2006年第10期1948-1952,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(49070031);湖南省自然科学基金资助项目(962027).

摘　　要：对清水塘重金属污染区土壤生态系统重金属的富集及毒性效应的研究结果表明,土壤中主要富集的重金属元素为生物毒性较强的Cd、Hg、As以及具有一定毒性的Zn、Pb、Cu,平均综合污染指数为6.40.大型土壤动物重金属含量的分析结果表明,重金属富集量随污染程度的增加而增加,尤其某些巨蚓科种类对Cd表现高富集,富集系数为11.96.通过染毒试验进一步证明,土壤动物种类和数量随Cd浓度的增加而减少.同工酶分析表明,Cd对蚯蚓同工酶活性有明显的毒性效应.污染区主要种植蔬菜作物,而重金属在蔬菜体内的富集量也随污染程度的增加而增加,其中蔬菜对Cd的富集有明显的品种间差异.The study on the heavy metals-polluted soil of Qingshuitang District, Zhuzhou City showed that the main enriched heavy metals in the soil were Cd, Hg, As, Zn, Pb and Cu, among which, the former three had strong biotoxicity while the others had definite toxicity, with the average integrative pollution index being 6.40. The heavy metals enrichment in soil animals increased with increasing pollution degree. Especially for some species of Megascoieci- dae, they had a high enrichment of Cd, with the enrichment index being 11.96. The species and quantity of soil animals decreased with increasing Cd concentration. Cd had an obvious biotoxic effect on Megsacoiecidae＇ s isozyme activity. The heavy metals enrichment in vegetables also increased with increasing pollution degree, but there existed obvious interspecies difference in Cd enrichment.

关 键 词：重金属污染 生物富集 急性毒性试验 土壤动物 同工酶 

分 类 号：X53[环境科学与工程—环境工程]