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时间:2020-03-23
《云南个旧锡矿区大屯盆地土壤重金属污染与生态风险评价.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第8期地质通报Vo1.33.No.82014年8月GEoLoGICALBULLETINOFCHINAAug.,2014云南个旧锡矿区大屯盆地土壤重金属污染与生态风险评价乔鹏炜,周小勇,杨军,雷梅,陈同斌QIAOPeng—wei,ZHOUXiao—yong,YANGJun,LEIMei,CHENTong—bin1.中国科学院地理科学与资源研究所,北京100101;2.中国科学院大学,北京1000491.InstituteofGeographicSciencesandNaturalResourcesResearch,CAS,Beijing100101,China;2.Un
2、iveni~ofChineseAcademyofSciences,Beqing100049,China摘要:土壤中的重金属直接影响农业安全生产,掌握不同耕地和土壤类型中重金属的污染程度可为削减生态风险提供依据。通过实地调查,对云南个旧锡矿区松树脚矿大屯盆地不同耕地和土壤类型的重金属含量,采用单因子指数法、内梅罗综合污染指数法进行污染评价,基于潜在生态危害指数法进行生态风险评价。结果表明,As、Cd、Cu、Cr、Ni、Pb和Zn七种元素中,As和Cd是大屯盆地农田土壤的主要污染因子,两者对污染程度的贡献率为97%,其中Cd的贡献率为68%;两者对生态风险的贡献率为87%。旱地重
3、金属污染程度和生态风险大于水田,红壤中重金属的污染程度和生态风险大于红色石灰土。从空间来看,个旧大屯盆地重金属污染程度总体呈现从西南向东北逐渐降低的趋势。关键词:重金属污染;生态风险;评价;土壤类型;锡矿区中图分类号:P618.44;X131.3;X142文献标志码:A文章编号:1671—2552(2014)08—1253—07QiaoPw,ZhouXY,YangJ,LeiM,ChenTB.HeavymetalpollutionandecologicalriskassessmentofDatunbasinintheGejiutinmimngarea,YunnanProvinc
4、e.GeologicalBulletinofChina,2014,33(8):1253—1259Abstract:Heavymetalsinthesoilboaywilldirectlyafectthesafetyofagriculturalproduction,andinvestigationofthepollutionlev-elindiferentcultivatedlandtypesandsoiltypeswillprovidethebasisforthereductionoftheaboveecologicalrisk.Theauthorsin—vestigated
5、theheavymetalcontentindiferentlanduseandsoiltypesthroughfieldworkandlaboratoryanalysis.PolutionassessmentwasconductedusingasinglefactorindexandNemerowpolutionindex,andecologicalriskassessmentwasalsocarriedOUtbasedonpotentialecologicalriskindex.TheresultsshowthatAsandCdarethemostimportantpol
6、utionfactorsamongAs,Cd,Cu,Cr,Ni,PbandZnelements.ThecontributionofAsandCdtothepolutionlevelis97%,withthecontributionofCdreaching68%.ThecontributionofAsandCdtOecologicalriskis87%,withCdalonecontributing68%.Inaddition,thepolutionlevelandecologicalriskofheawmetalsindrylandisgreaterthanthoseinpa
7、ddyfield,andthepolutionlevelandecologicalriskofheavymetalsatealsogreaterinredsoilthanincerrarossa.Spatially,thepolutionlevelofheavymetalsinDatunbasinoftheGejiuminingareagenerallyshowsadecreasingtrendfromsouthwesttOnortheast.Keywords:heavymetalpolution;ec
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