宁阳县农用地土壤重金属污染调查评价

Investigation of heavy metal pollution in agricultural land soil in Ningyang County

本研究以山东省泰安市宁阳县12乡镇农用地为研究对象,对Hg、As、Pb、Cd、Cu、Ni、Zn、Cr及pH进行测定分析,利用ArcGIS-样条函数法预测分析了研究区土壤重金属空间分布,采用内梅罗综合污染指数、地累积指数法和潜在生态风险指数法对土壤重金属污染情况进行评价,分析了不同土地利用方式和乡镇尺度下,土壤重金属的积累和污染风险。结果表明:1)研究区土壤重金属均低于农用地土壤污染风险筛选值,内梅罗指数、地累积指数和潜在生态风险指数均表现为良好,但Hg超出土壤环境背景值1.45倍,主要为土壤母质影响,其次是人为生活生产活动的影响;2)研究区不同的农用地土地利用方式下,总体污染情况表现相似,但相较于林园地,耕地利用方式下Hg、Pb、Ni、Cu和Cd更容易积累。

In this study,the agricultural land of 12 townships in Ningyang County,Tai an City,Shandong Province was taken as the research object,and the Hg,As,Pb,Cd,Cu,Ni,Zn,Cr and pH values were measured and analyzed.The ArcGIS-spline function method was used to predict and analyze the spatial distribution of soil heavy metals in the study area.The Nemero comprehensive pollution index,geo-accumulation index and potential ecological risk index were used to evaluate the soil heavy metal pollution.The accumulation and pollution risk of heavy metals in soil under different land use patterns and township scales were analyzed.The results showed that:1)The soil heavy metals in the study area were lower than the soil pollution risk screening value of agricultural land.The Nemero index,geo-accumulation index and potential ecological risk index were all good,but Hg exceeded the soil environmental background value by 1.45 times,mainly due to the influence of soil parent material,followed by the influence of human life and production activities.2)Under different agricultural land use patterns in the study area,the overall pollution situation is similar,but compared with the garden land,Hg,Pb,Ni,Cu and Cd are more likely to accumulate under the cultivated land use pattern.