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1、农业环境科学学报2006,25(1):182-185JournalofAgro-EnvironmentScience北京南部地区农业土壤重金属分布特征与评价付华1,吴雁华2,魏立华1(1.首都师范大学资源环境与旅游学院,北京100037;2.首都师范大学初等教育学院,北京100037)摘要:包括通州、大兴、丰台和房山4区的北京南部地区的土壤存在不同程度的重金属污染。在该区域选取25个土壤样品,其中剖面JN1(JN表示北京南部地区土壤剖面,下同)按土壤发生层在春季(3月下旬)和秋季(11月上旬)采样,研究土壤Pb、Zn、Cu、Cd和As等元素时空分布特征及其污染程度。
2、结果表明,该地区土壤重金属含量不等,由高到低依次为Zn、Pb、Cu、As和Cd,属于歧义性污染。区域内自东向西,土壤重金属含量逐渐减少,其中沿河流、高等级公路向两侧,土壤重金属含量由高到低。土壤重金属集中于土壤表层,Cd、Cu、Pb、Zn主要富集在0~20cm土层中,20cm以下深度的含量大大减小,土壤重金属元素含量春季高于秋季。土壤综合污染指数均大于1,处于轻污染以上水平。关键词:北京南部地区;土壤污染;重金属;分布;污染指数中图分类号:X825文献标识码:A文章编号:1672-2043(2006)01-0182-04DistributionandEvaluati
3、onofHeavyMetalsinAgriculturalSoilinSouthernAreaofBeijingFUHua1,WUYan-hua2,WEILi-hua1(1.Resources,Environment&TourismSchool,CapitalNormalUniversity,Beijing100037,China;2.PrimaryEducationSchool,CapitalNor-malUniversity,Beijing100037,China)Abstract:ThesouthernareaofBeijingincludesTongzhou
4、,Daxing,FengtaiandFangshanDistrict.Thesoilinthisareahasbeenpollutedbyheavymetals.Inordertopreventthisareafromfurtherpollutionandimprovetheagricultureproductquality,itisimperativetostudytheheavymetalsdistributionandtheirpollutioneffects.Twenty-fivesoilsamplesaretaken,andamongthese,theso
5、ilfromJN1profileistakeninthespring(thelasttendaysofMarch)andautumn(thefirsttendaysofNovember)respectively.ThedistributionandpollutionevaluationforPb,Zn,Cu,CdandAsaremainlyresearched.Thecontentsofheavymetalsinthesoilsaredifferentinthisregion,withtheorderintermofthecontentbeingZn>Pb>Cu>A
6、s>Cd.Fromtheeasttothewestinthisarea,thecontentsofsoilheavymetalsdecreasegradually,andalongtheriversandhighways,thecontentsofsoilheavymetalsalsodecreasefromtheinsidetotheoutsidegradually.Theheavymetalsconcentrateontheupperhorizons,especiallythe0~20cmhorizoninthesoilprofile,anddecreaseab
7、ruptlybelowthedepthof20cm.Thecontentsofsoilheavymetalsinthespringarehigherthanthoseintheautumn.Alltheheavymetalpollutionindexessurplus1.0,suggestingthatthesoilsinthisareaarepollutedbytheheavymetalsslightly.Keywords:southernareaofBeijing;soilpollution;heavymetal;distribution;pollution