毛铺水库周边土壤污染及潜在生态风险评价

Investigation of Soil Pollution around Maopu Reservoir and Its Environmental Risk Assessment

对毛铺水库周边农田土壤中的重金属(Cu、Pb、Zn、Cd)、总氮和总磷含量进行了监测,分析污染物的主要来源,并对其潜在的生态风险进行了评价。结果表明:毛铺水库周边农田土壤已受到重金属不同程度的污染,Cd污染已影响到了部分农田的安全生产。综合污染指数评价显示,2号和3号采样点土壤尚清洁;4、5和6号采样点土壤属轻度污染。Cd的生态风险系数最大,1、2、3和5号采样点土壤中Cd属中等生态风险危害,4号和6号采样点土壤中Cd属强度生态风险危害。

The contents of Cu, Pb, Zn, Cd, total nitrogen and total phosphorus in farmland soils around the Maopu reservoir were monitored to evaluate soil environmental pollution and ecological risk by using single factor index method, comprehensive pollution index method and potential ecological risk index method, the potential sources of pollutants in soil were also elucidated. The results show that farmland soils around the Maopu reservoir have suffered from heavy metals pollution. The safety production has been affected by Cd pollution. The evaluation by comprehensive pollution index method indicates that the soils from No. 2 and No. 3 sampling points are clean, and the pollution in the soils from No. 4, No. 5 and No. 6 sampling points is light. The ecological risk coefficients of Cd are highest, the ecological risk coefficients of Cd in soils from No. 1, No. 2, No. 3 and No. 5 sampling points are medium, and there are strong Cd ecological risks in the soils from No. 4 and No. 6 sampling points.