开封市化肥河污灌区土壤重金属潜在生态风险评价

以开封市化肥河污灌区为例,采用潜在生态风险指数法对土壤重金属污染进行了生态风险评价。结果表明:单个重金属的潜在生态风险以Cd最为严重,Ecd变化在300～1086之间,各样点均达到极度生态危害水平,其余重金属均为轻度危害,危害程度依次为Cd>Cu>Pb>Zn>Ni。在研究的5种重金属中,镉元素对生态风险的贡献率最高,是构成潜在生态风险的主要因子。污灌区土壤重金属综合生态风险指数为608.51,达到很强生态危害程度。与污灌区相比,对照区3个样点的生态总风险程度相对较轻,但也存在着比较明显的镉风险。

Assessment of Potential Ecological Risk of Soil Heavy Metals in the Sewage Irrigated Area of the Huafei River, Kaifeng City

The ecological risks of soil heavy metals in the sewage irrigated area of the Huafei River in Kaifeng City were discussed with the method of potential ecological risk index invented by Hakanson. The results showed that the soils have serious ecological risks of Cd with the single ecological risk index from 300 to 1086, and slight risks of Pb, Cu and Zn with the index less than 20. 42. The risk order of heavy metals is Cd>Cu>Pb>Zn>Ni. Among the five metals, Cd is the main risk factor in the sewage irrigated area. Integrated ecological risk index of soil heavy metals in the sewage irrigated area is 608. 51, which indicates that the soil ecological risk of the area is very serious. By comparing the sewage irrigated area with the control area, the integrated ecological risks of heavy metals, except for Cd, are relatively light in the control area.