安徽农业科学

[目的]评估内蒙古自治区中西部地区经济林土壤重金属污染状况。[方法]采集内蒙古自治区中西部地区6个盟(市)共计458个经济林土壤样品(0～20 cm)进行Pb、Cd、Cu、Zn、Ni、Cr、As、Hg共8种重金属含量分析，采用地积累指数法和潜在生态风险指数法对土壤污染状况进行评价。[结果]研究区域经济林土壤中Pb、Cd、Cu、Zn、Ni、Cr、As、Hg含量均低于农用地土壤污染风险筛选值；6个盟(市)Pb、Cu、Zn、Ni、Cr、As、Hg含量地积累指数(I_geo)小于0,土壤无污染；包头市和巴彦淖尔市Cd的I_geo在0～1,土壤轻度污染。6个盟(市)经济林土壤潜在生态风险指数(RI)小于150,属于轻微污染；内蒙古自治区中西部地区潜在生态风险指数(RI)平均值为119.70,土壤属于轻微污染。[结论]内蒙古自治区中西部地区经济林土壤8种重金属污染危害较轻，土壤重金属生态风险较低。

[Objective] To evaluate the heavy metal pollution status of economic forest soil in the central and western Inner Mongolia Autonomous Region. [Method] A total of 458 soil samples(0-20 cm) from 6 leagues(cities) in the central and western leagues(cities) of Inner Mongolia Autonomous Region were collected for Pb Cd, Cu, Zn, Ni, Cr, As and Hg. A total of 8 heavy metal content analyses were conducted, and the soil pollution status was evaluated using the soil accumulation index(I_geo) method and the potential ecological hazard risk index(RI) method. [Result] The results showed that the content of Pb, Cd, Cu, Zn, Ni, Cr, As, and Hg in the economic forest soil in the study area was lower than the screening value for soil pollution risk in agricultural land; the geo-accumulation index(I_geo) of heavy metals Pb, Cu, Zn, Ni, Cr, As, and Hg in 6 leagues(cities) is less than 0, indicating no soil pollution; the Cd(I_geo) levels in Baotou City and Bayannur City are between 0 and 1, indicating mild soil pollution. The potential ecological risk index(RI) of economic forest soil in 6 leagues(cities) is less than 150, which belongs to minor pollution. The average potential ecological hazard risk index(RI) of the central and western Inner Mongolia Autonomous Region is 119.70, indicating that the soil is at a slight pollution. [Conclusion] The pollution hazards of 8 heavy metals in the soil of economic forests in the central and western Inner Mongolia Autonomous Region are relatively light, and the ecological risks of heavy metals in the soil are low.