草海湿地保护区土壤重金属及其污染评价

Caohai Wetland Nature Reserve Soil Heavy Metals Content and Pollution Evaluation

通过对贵州草海湿地国家级自然保护区土壤采样实测重金属含量数据分析及土壤污染评价,结果表明:草海土壤重金属含量对照国标土壤二级限制值主要超标元素是镉、锌、镍,其次是砷、铬、铅,而铜、汞未超标。通过土壤污染物分担率和内梅罗污染指数总体与分区评价草海盆地型湿地重金属污染,反映出接近污染源区域和水流通道地段重金属污染加重。

Heavy metals in soil samples from Caohai, a national nature reserve, were measured. Compared with the national standards for class-II soil limit values, the results showed that contents of heavy metals excessive in soil were Cd, Zn, Ni, As, Cr and Pb, while contents of Cu, Hg were not exceeded. Indices of N. L. Nemerow pollu- ted evaluation and soil participation rate showed that heavy pollution became relatively serious near pollution sources and related water channel sections of the basin wetland ecosystem.