【摘要】 以攀枝花市盐边县某芒果种植区为研究区,采集47个表层土壤(0～20 cm)样本,测试Cd、As、Cr、Cu、Ni和Pb6种重金属元素含量。利用ArcGIS空间分析功能对土壤中重金属元素的空间分布特征进行分析,并采用单因子污染指数法、内梅罗综合污染指数法和潜在生态危害指数法对研究区土壤重金属污染程度进行评价。结果表明:研究区Cd全部超标,As、Cu和Pb少量超标,仅Cr和Ni符合国家土壤环境质量标准要求;六种重金属含量的平均值均超过四川省土壤元素背景值;单因子污染指数评价结果表明研究区Cd处于中度-重度污染,其余重金属未污染研究区土壤;内梅罗综合污染指数评价结果表明研究区处于中度污染和重度污染的点位比例各占34.04%和65.96%;Cd、As、Cr、Cu、Ni和Pb单项潜在生态危害指数依次为980.069、18.486、1.983、5.005、6.285、4.640,综合潜在生态危害指数在777.344～924.348,总体呈现的Cd潜在生态危害较强,建议采取措施进行防控。更多还原

【Abstract】 Taking a mango planting area in Yanbian County of Panzhihua City as the research area, 47 surface soil(0～20 cm) samples were collected to test the content of 6 heavy metals in Cd, As, Cr, Cu, Ni and Pb. The spatial distribution characteristics of heavy metals in soil were analyzed by using ArcGIS spatial analysis function, and the pollution degree of heavy metals in soil was evaluated by single factor pollution index method, Nemero comprehensive pollution index method and potential ecological hazard index method. The results show that the Cd in the study are exceed the standard, and the As, Cu and Pb are slightly exceeded. Only Cr and Ni meet the national soil environmental quality standards. The average value of the six heavy metals exceed the background value of soil elements in Sichuan Province. The impact of single factor pollution index indicates that the Cd in the study area is in moderate-severe pollution and the others did not pollute the soil in the study area. The results of Nemero comprehensive pollution index show that the proportion of sampling points in moderate pollution and severe pollution accounted for 34.04% and 65.96% respectively.. The single potential ecological hazard indexes of Cd, As, Cr, Cu, Ni and Pb are 980.069, 18.486, 1.983, 5.005, 6.285 and 4.640 respectively, and the comprehensive potential ecological hazard index is between 777.344 and 924.348. The overall potential ecological hazards of Cd are relatively strong, suggesting that measures should be taken to prevent and control.更多还原