贵州省威宁县核桃基地土壤重金属元素含量及污染评价

对贵州省威宁县牛棚镇黑田村、新山村的核桃基地土壤中铅、镉、铬、铜、汞、砷这6种重金元素含量进行了检测，以绿色食品产地环境条件中土壤环境要求为背景值作为标准对其单项和综合污染指数进行分析评价。结果表明：调查区域内土壤重金属含量差异较大，且部分受到了不同程度的污染。在重金属污染因子中，Cd是主要污染因子。

Monitoring and Evaluation of Heavy Metals in Soil of Walnut Production Field

20 soil samples in walnut production field of Niupeng town in Weining area of Guizhou was tested. Six trace elements were determined,they were Pb,Cd,Cr,Cu,Hg and As . Combined with health quality standard of soil in walnut production field,pollution of heavy metals was evaluated using single factor pollution index and Nemerow pollution index. The results showed that the contents of heavy metals in the soil vary markedly and some of the area was polluted . The major pollution factors of the soil was Cd.