甘肃徽县耕层土壤重金属污染现状评价  

Evaluation on the pollution of heavy metals in the cultivated soil in Hui County of Gansu Province

作　　者：曹雪敏[1] 杨虎德[1,2] 

机构地区：[1]甘肃农业大学资源与环境学院,甘肃兰州730070 [2]甘肃省农业科学院土壤肥料研究所,甘肃兰州730070

出　　处：《甘肃农业大学学报》2015年第5期134-140,共7页Journal of Gansu Agricultural University

摘　　要：对甘肃省徽县耕层土壤中的铬、铅、汞、砷、镉进行测定分析,利用自然背景值和国标二级评价标准(GB15618-1995)来评价其重金属含量状况,同时借助ArcGIS软件研究了污染指数的空间分布状况.结果表明:以土壤环境自然背景值为评价标准,徽县土壤中的重金属的平均含量均已超过污染指标;以国标二级为评价标准,则除镉以外的4种重金属的单项污染值全都小于1,未受污染.一般农区综合污染指数为0.54,总体上来看未受污染,污染区综合污染指数0.82,属于警戒区.The contents of heavy metals（Hg,Pb,Cr,Cd and As）in soil of Hui County,Gansu Province were investigated to evaluate soil environmental pollution of heavy metals by using natural background values and national standard（GB 15618-1995）,furthermore,the spatial distribution of pollution index was analyzed with the aid of geographical information system（ArcGIS）technology.The results showed that the soil was polluted by heavy metals,Hg,Pb,Cr,Cd and As when using natural background values as evaluation standard,but was not polluted by these heavy metals except Cd while using national standard（GB 15618-1995）as evaluation standard.In the general agricultural areas,comprehensive pollution index was 0.54,which indicated unpolluted.But the the comprehensive pollution index of contaminated area was0.82,which belonged to the warning value.

关 键 词：重金属 空间分布 土壤环境质量 ARCGIS 

分 类 号：S153[农业科学—土壤学]