重庆市蔬菜地土壤重金属特征研究

研究结果表明重庆市蔬菜地0~20cm和20~40cm土层土壤重金属Cr、Ni、Cu、Zn、As、Pb含量无显著差异,Cd、Hg含量差异显著。不同土壤类型平均重金属含量和变异系数差异均较小。城郊区、工矿区和一般农区重金属Ni、Cu、Zn、As、Pb含量及阳离子代换量无显著差异。不同土壤类型和不同区域重金属间均具较强相关性,重金属Cu、Ni、Cr间具有较强伴生关系。重庆市蔬菜地土壤重金属Cd污染较重。

Research on heavy metal's characteristics in the soil of vegetable farms in Chongqing City

The contents of heavy metals of Cr, Ni, Cu, Zn, As and Pb in 0- 20cm and 20- 40cm layers in soils have no obvious differences in the vegetable farms, and the contents of Cd and Hg have obvious differences. The differences of average contents and the variable coefficient of the heavy metals in different types of soil are smaller. The contents of heavy metals of Ni, Cu, Zn, As and Pb and the cation exchange capacity in the outskirts of a town and the areas of the factories and mines and the general countryside have no remarkable differences. The heavy metals in different types of soil and different regions have more coherency, and the Cu, Ni and Cr of heavy metals have more associated relation. The pollution of Cd of vegetable farm is bigger in Chongqing.