太湖地区温室土壤重金属污染状况调查及评价

Investigation and Evaluation of Heavy Metal Contamination of Greenhouse Soils in Tai Lake Region

本文调查了太湖地区温室蔬菜土壤中重金属Cr、Cd、Cu、Zn、Pb的全量和有效态含量,并参照相关标准对其进行污染程度评价.结果表明:不论是0～20 cm还是20～30 cm土层,各种重金属(Cr除外)全量含量均高于背景值.不论是全量还是有效态,在0～20 cm土层中含量基本上高于20～30 cm土层中含量.采用单因子指数法和内梅罗综合污染指数法对测定结果进行评价.以江苏省土壤背景值为评价标准,该地区土壤属轻污染:以国家二级标准为评价标准,该地区土壤未被污染.

The contents of heavy metals (Cr、Cd、Cu、Zn、Pb) of the greenhouse soils in Tai Lake region were analyzed and the polluted extents were evaluated according to the corresponding national standards. The results showed that the total contents of heavy metals (except Cr) were higher than the background values of Jiangsu Province. The total contents and available contents of heavy metals in 0 ~ 20 cm horizon soils were higher than in 20 ~ 30 cm horizon soils. The single factor pollution index and Nemorow multi-factor pollution index method were used to evaluate the soil pollution. According to the background values of Jiangsu Province and the Soil Environmental Quality Standard, the studied soils were evaluated at lightly-polluted and unpolluted degrees, respectively.