呼和浩特市近郊农田土壤重金属污染特征及生态风险分析  

Pollution characteristic of heavy metal and ecological risk assessment in suburban agricultural soil in Hohhot city

作　　者：侯德坤 张福金[3] 何江[2] 鞠文浩[1] 尹鑫 莎娜 刘广华[3] 

机构地区：[1]威海市产品质量监督检验所,山东威海264210 [2]内蒙古大学环境与生态学院,内蒙古呼和浩特010021 [3]内蒙古农牧业科学院,内蒙古呼和浩特010031

出　　处：《北方农业学报》2017年第6期85-91,共7页Journal of Northern Agriculture

基　　金：内蒙古科技应用计划项目(2014KJ0610);内蒙古农牧业科学院创新基金项目(2014CXJJN01;2017CXJJNO15)

摘　　要：通过野外调查取样和室内监测,对呼和浩特市近郊农田土壤中重金属Cu、Pb、Zn和Cr的含量进行了测定与综合污染评价。结果显示,Cu、Pb、Zn、Cr的平均含量分别为60.76,145.99,80.49,34.71 mg/kg,Cu、Zn和Cr 3种元素平均含量低于国家土地环境质量标准二级标准的限值。潜在生态风险指数评估表明呼和浩特市近郊农田土壤中重金属PERI值在35.02~132.96,综合污染程度为低度潜在生态风险;地质累积指数评价分析表明呼和浩特市郊农田中Zn和Cr存在区域性轻度污染,Pb及Cu在此区域的污染程度为中度,应引起相关管理部门的重视。The content of some typical heavy metals including Cu, Pb, Zn and Cr of farmland soil around Hohhot city were detected through field investigation and laboratory analysis in this paper. The pollution comprehensive assessments on soil heavy metal were made based on index of land accumulation method and potential ecological risk index method. The results showed that the content of Cu, Pb, Zn and Cr in suburban agricultural soil from Hohhot city was 60.76,145.99,80.49,34.71 mg/kg,respectively, and the mean content of Cu,Zn and Cr was below the second standard limit value of ＂China environmental quality standard for soils＂. The PREI value was in the range of 35.02 -132.96, which indicated a low ecological risk. The land accumulation index showed that a slight pollution of Zn and Cr occurred in Hohhot suburban agricultural soil, and there was moderate pollution of Cu and Pb, which should be caused by the attention of the authorities.

关 键 词：农田土壤 重金属 潜在生态风险指数法 地质累积指数法 

分 类 号：X53[环境科学与工程—环境工程]