包头市郊区农用地表层土壤重金属锌含量的调查与评价

目的]评价包头市郊区农用地表层土壤重金属锌环境质量。方法]按照"梅花型"取样,测定包头市郊区菜地、马铃薯地、小麦地、玉米地等不同土地类型土壤重金属锌含量,对研究区土壤环境质量进行评价。结果]研究区土壤锌含量最高值为86 mg/kg,平均值为72 mg/kg,单项污染指数最大值为0.29,污染指数Pi≤0.7,说明包头市郊区农用地表层土壤重金属锌环境质量属于清洁级,种植小麦、玉米等粮食作物和蔬菜均没有安全风险。结论]该研究为包头市进一步开展无公害农产品基地建设、评价土壤重金属污染潜力和农用土地资源与环境适宜性奠定了基础。

Investigation and Evaluation of Heavy Metal Zinc in the Surface Soil of the Agricultural Land in Baotou Suburb

Objective] The research aimed to evaluate the environmental quality of heavy metal Zn in the surface soil of the agricultural land in Baotou suburb.Method] Samples were collected by using quincunx to determine the content of heavy metal Zn in the soil of different types of land such as vegetable land,potato land,wheat land and maize land in Baotou suburb.And the soil environmental quality in the research area was evaluated.Result] The highest content of Zn in the soil of the research area was 86 mg/kg,the average value was 72 mg/kg,the maximum monomial pollution index was 0.29 and pollution index(Pi) was equal to or less than 0.7.This indicated that the environmental quality of heavy metal Zn in the surface soil of the agricultural land in Baotou suburb belonged to the clean grade.And there was no safety risk for planting food crops(wheat,corn,etc.) and vegetables on the soil.Conclusion] The research laid the foundation for further developing the base construction for non-pollution agricultural products and evaluating the pollution potential of heavy metals in the soil,the suitability of agricultural land resources and the environment.