三峡库区消落区土壤重金属污染调查与评价

通过对三峡重庆库区16个区县，183个土壤样品的分析，表明三峡库区消落区土壤重金属含虽均达到国家土壤环境标准3级以上。其中Cu含量范围为10.7～80.2mg／kg，均值为37.0mg／kg；Pb含量范围为14.6～51.8mg／kg，均值为29.3mg／kg；Zn含量范围为47.5～93.3mg／kg，均值为72.7mg／kg；Cd含量范围为0.081～0.864mg／kg，均值为0.321mg／kg；Hg含量范围为0.032～0.204mg／kg，均值为0.059mg／kg；As含量范围为4.63～12.7mg／kg，均值为8.65mg／kg。Cu、Cd之间存在极显著正相关关系，其余各重金属之间相关性不明显，pH值对重金属含量的影响不大。三峡库区消落区土壤主要受Cd、Cu污染。通过系统聚类分析，土壤重金属有明显的地域分布，即水库上游区、中游区和下游区。

Investigation and Evaluation on Heavy Metal Pollution of Water-Level-Fluctuating Zone in Three Gorge Reservoir Area

Analyzing 183 soil samples of 16 counties in Chongqing Three Gorges reservoir area,it showed content of soil heavy metal of water-level-fluctuating zone in Three Gorge reservoir area was better than soil environmental standard grade 3.The mean Cu content was 37.0 mg/kg,ranging from 10.7 to 80.2 mg/kg.The mean Pb content was 29.3 mg/kg,ranging from 14.6 to 51.8 mg/kg.The mean Zn was 72.7 mg/kg,ranging from 47.5 to 93.3 mg/kg.The mean Cd content was 0.321 mg/kg,ranging from 0.081 to 0.864 mg/kg.The mean Hg content was 0.059 mg/kg,ranging from 0.032 to 0.204 mg/kg.The mean As was 8.65 mg/kg,ranging from 4.63 to 12.7 mg/kg.There is a remarkable positive relation between Cu and Cd. The relativities among other heavy metals are not obvious. The effect of pH to heavy metals is small. The pollution type is Cu-Cd. By the method of system cluster,the distribution of soil heavy metal are regularity. It can be disparted three parts(upper,middle and down reaches).