围场县农田土壤重金属污染状况调查与评价  

Investigation and evaluation of heavy metal contamination of cropland in Weichang County

作　　者：潘寻[1,2] 

机构地区：[1]国家中华人民共和国环境保护部环境保护对外合作中心,北京100035 [2]河北省承德市围场县环保局,河北承德068450

出　　处：《河北农业大学学报》2017年第5期25-31,共7页Journal of Hebei Agricultural University

基　　金：国家自然科学基金项目(51678559)

摘　　要：调查了围场县37个乡镇农田土壤重金属含量,采用单因子指数法、内梅罗指数法、生态风险指数法、污染负荷指数法和地质累计指数法对其进行评价,并对各种重金属的潜在污染来源进行了初步分析。结果表明:围场县69个农田土壤监测点中Cu、Cd、Pb、Cr、Zn、Ni、As和Hg的平均含量分别为9.75,0.11,14.07,32.63,37.71,15.17,8.90和0.00mg/kg。当采用国家土壤环境质量二级标准作为评价标准时,各评价方法无污染样点比例均超过98.6%,仅As为轻微污染;当采用围场本地土壤重金属背景值作为评价标准时,土壤污染程度普遍提高,且各评价方法结果存在一定差异。围场地区农田土壤重金属检出水平较低,整体土壤环境质量优良,生态系统危害性不明显,但当地农业耕作模式的特殊性有诱发重金属累积的趋势,因此仍需严格控制重金属污染源头,减缓土壤环境恶化风险,确保农田土壤环境质量安全。On the base of investigation of heavy metal content in 69 cropland soil samples from 37 townships of Weichang County,the pollution status of local soil were evaluated by single factor index method,Nemerow index method,ecological risk index method,pollution load index method and geo-accumulation index method.The potential sources of each heavy metal were also preliminarily analyzed.The results show that the average concentrations of Cu,Cd,Pb,Cr,Zn,Ni,As and Hg were 9.75,0.11,14.07,32.63,37.71,15.17,8.90 and 0.00 mg/kg,respectively.When the secondary standard of National Environmental Quality Standard for Soil was adopted as the evaluation standard,the proportions of non-polluted samples for all methods were more than 98.6%,while only As ranked slightly polluted;when the local background value for heavy metals was adopted as the evaluation standard,the soil pollution level generally increased,and the results of evaluation methods showed differences.The concentration level of heavy metals in cropland of Weichang County is relatively low,the over-all soil quality is good and the ecological risk is not obvious.However,the peculiarity of local traditional farming practices has the tendency to induce the accumulation of heavy metals.Therefore,it is still necessary to strictly control the source of heavy metal pollution,thus mitigate the degradation risk of cropland,and ensure the safety of cropland soil quality.

关 键 词：围场 农田 重金属 评价 来源 

分 类 号：X53[环境科学与工程—环境工程]