农业资源与环境学报2019年7月·第36卷·第4期:513-521July2019·Vol.36·No.4:513-521JournalofAgriculturalResourcesandEnvironment
周勤利,王学东,李志涛,等.宁夏贺兰县土壤重金属分布特征及其生态风险评价[J].农业资源与环境学报,2019,36(4):513-521.ZHOUQin-li,WANGXue-dong,LIZhi-tao,etal.DistributioncharacteristicsandecologicalriskassessmentofsoilheavymetalinHelanCountyofNingxia,China[J].JournalofAgriculturalResourcesandEnvironment,2019,36(4):513-521.
DistributioncharacteristicsandecologicalriskassessmentofsoilheavymetalinHelanCountyofNingxia,ChinaZHOUQin-li1,WANGXue-dong1,LIZhi-tao2*,WANGXia-hui2,HEJun2,JIGuo-hua2(1.CollegeofResource,EnvironmentandTourism,CapitalNormalUniversity,Beijing100048,China;2.ChineseAcademyofEnvironmen⁃talPlanning,Beijing100012,China)Abstract:NingxiaHelanCountywastakenastheresearchareainthispapertostudythedistributioncharacteristicsandecologicalriskofheavymetalsinfarmlandsoilinnorthwestChina.140topsoilsampleswerecollectedaimingtoanalyzeandmeasuretheconcentrationofCr,Ni,Cu,Zn,As,CdandPbbelongingtoheavymetalelements.Thedistributions,soilenvironmentstatusandecologicalriskofthesevenheavymetalswerestudiedbyNemerowpollutionindexandHåkansonpotentialecologicalriskindexmethods.Theresultsshowedthatcon⁃centrationsofCr,Ni,Cu,Zn,AsandPbwerealllowerthanthesecond-levelofEnvironmentalQualityStandardforSoilsofChinaexceptthatconcentrationsofCdof1.42%paredwiththebackgroundvalues,sevenheavymet⁃alsofallsamplesshoweddifferentdegreeaccumulation,inwhichCd,Nielementsbeyondthebackgroundvalueratioreached100%and85%.Spatialdistributionoftheconcentrationsofthesevenheavymetalshadobviousaccordance.Thecontentofeachelementwasevenlydistributed.ThehighcontentofeachelementwasconcentratedinthecentralandeasternpartofHelanCounty,whichwasrelatedtohumanactivities.Thecalculationresultsofsingle-factorpollutionindexshowedthatamongthe140soilsamples,0.71%ofCdweremoderatecon⁃tamination,7.14%ofNiand5%ofAswereslightclean,Cr,Cu,Zn,Pbofallsampleswereallclean.Accordingtotheindividualpotentialecologicalriskindex(Eir)ofheavymetals,theaveragepotentialecologicalriskindexofCdelementwas97.68,whichindicatedthatCdhadreachedtheseriousrisklevel,becomingthemainelementofpotentialecologicalrisk.Allinall,thequalityoffarmlandsoilinHelanCoun⁃tyofNingxiaisgood,butitisnoteworthythattheconcentrationofCd,Nihasaseriousaccumulation.Keywords:Ningxia;soil;heavymetal;distributioncharacteristics;potentialecologicalrisk宁夏贺兰县土壤重金属分布特征及其生态风险评价周勤利1,王学东1,李志涛2*,王夏晖2,何俊2,季国华2(1.首都师范大学资源环境与旅游学院,北京100048;2.生态环境部环境规划院,北京100012)