【摘要】 以饮马河中游为研究区域,测定土壤重金属(Cu,Zn,Pb,Cr)浓度,研究湿地沉积物与陆地土壤中9种土地利用方式下重金属的含量分布以及风险状况,探究单因子污染指数法、内梅罗综合指数、地累积指数法和潜在生态风险评价法4种评价体系的准确性。结果表明,Pb在陆地土壤中富集量相对较大,Cr在湿地沉积物中富集量相对较大,在不同类型土壤中Cu,Zn分布无显著差异;评价体系采用地累积指数法与潜在生态风险评价法相结合较为准确。综合2种评价结果,研究区域具有轻微的潜在风险,其中,Pb贡献率最高,部分区域呈现轻微污染。更多还原

【Abstract】 Using Yinma river middle reaches as a study area, we measured the concentrations of soil heavy metals(Cu, Zn, Pb, Cr),studied the distribution and risk status of heavy metals in wetland sediments and terrestrial soils, and explored the accuracy of the four evaluation systems of single factor pollution index method, Nemerow index, geoaccumulation index method and potential ecological risk assessment method. The results showed that Pb was higher in terrestrial soils, and Cr was higher in wetland soils. There was no significant difference in the distribution of Cu and Zn in different types of soils. The evaluation system was more accurate in combination with the geo accumulation index method and the potential ecological risk assessment method. Based on the results of the two evaluations,the study area has a slight potential risk, of which Pb has the highest contribution rate, and some areas have slight pollution, followed by Cu, Cr and Zn.更多还原