基于GIS的江西省耕地土壤重金属污染评价研究

Evaluation of Heavy Metal Pollution of Farmland Soil in Jiangxi Province Based on GIS

为探明江西省耕地土壤重金属污染状况,在全省耕地共采集370个土壤样品,测得重金属Pb、Zn、Cu的含量,运用GIS和地理统计学等技术手段,采用单因子污染指数法和内梅罗综合污染指数法对全省耕地进行系统性评价,然后将污染状况进行空间插值可视化表达。结果表明,江西省耕地土壤重金属Pb、Zn、Cu单因子污染指数平均值分别为0.40、2.23、0.99,但最大值和最小值之间相差较大,整体表明重金属Pb无污染,Cu污染较轻,而Zn污染最为严重。全省耕地土壤Pb、Zn、Cu内梅罗污染综合指数为1.64,综合污染等级为轻度污染。

In order to understand the contamination status of heavy metals pollution of farmland soil in Jiangxi Province,370 soil samples were collected and the contents of heavy metals Pb,Zn,Cu in these samples were measured.Based on GIS and geostatistical methods,the soils in Jiangxi Province were evaluated with sin-gle factor pollution index and nemerow comprehensive pollution index,and the pollution status in the farmland of Jiangxi Province were expressed by spatial interpolation visualization.The results showed that in Jiangxi Province the average values of the single factor pollution index of soil heavy metals Pb,Zn,Cu were 0.4,2.23, 0.99,but there was a big difference between the maximum and minimum values.Overall,the soils had non-pol-lution of Ph,light pollution of Cu,and severe pollution of Zn.The nemerow comprehensive pollution index of Pb,Cu and Zn of the soils was 1.64,the soils of farmland in Jiangxi Province had light heavy metal contamina-tion.