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时间:2019-05-19
《污灌农田土壤-作物体系重金属污染评价》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、2015年1月农业机械学报第46卷第1期doi:10.6041/j.issn.1000-1298.2015.01.022*污灌农田土壤-作物体系重金属污染评价11,2211庞妍同延安梁连友吉普辉唐希望(1.西北农林科技大学资源环境学院,陕西杨凌712100;2.农业部西北植物营养与农业环境重点实验室,陕西杨凌712100)摘要:对陕西省西安市污灌区农田土壤、小麦和蔬菜等农作物样品的Cd、Cr、Cu、Pb、Zn含量进行了测定。结果表明,研究区土壤Cd、Pb平均值高于西安市和陕西省土壤背景值,Cu、Zn平均值高于陕西省土壤背景值。相关性分析结果显示,
2、土壤Cd和Pb呈显著正相关关系,Zn与Cr、Cu分别呈显著和极显著正相关关系。结合主成分分析可知,土壤Cd和Pb主要受人为因素影响,Cr、Cu、Zn主要受成土母质影响。潜在生态危害指数法和内梅罗污染指数法的结果均表明污灌区农田土壤Cd已达到最强污染级别。污灌区小麦样品中Cr、Pb超标率分别到达70.00%和80.00%,茄果类蔬菜Cd、Cr和Pb超标率分别为66.67%、100%和66.67%,花菜类和叶菜类中Cd、Cr和Pb超标率均为100%。建议污灌区尽量避免种植重金属转移系数高的花菜类和叶菜类蔬菜,并对含Cd污水经过严格处理后再用于灌溉。关
3、键词:污灌农田土壤作物重金属潜在生态危害指数法内梅罗污染指数法中图分类号:X825文献标识码:A文章编号:1000-1298(2015)01-0148-07AssessmentofHeavyMetalPollutioninSoil-CropSystemonSewageIrrigatedFarmland11,2211PangYanTongYan'anLiangLianyouJiPuhuiTangXiwang(1.CollegeofNatureResourceandEnvironment,NorthwestA&FUniversity,Yangling
4、,Shaanxi712100,China2.KeyLaboratoryofPlantNutritionandAgri-environmentinNorthwestChina,MOA,Yangling,Shaanxi712100,China)Abstract:TheconcentrationsofCd,Cr,Cu,Pb,Zninsoil,wheatandvegetablesamplesfromsewageirrigatedfarmlandinXi’an,ShaanxiProvince,weredetermined.Resultsindicatedt
5、hataveragecontentsofCdandPbintheresearchareawerehigherthansoilbackgroundvaluesinXi’anandShaanxiProvince,respectively,andtheaveragecontentsofCuandZnwerehigherthansoilbackgroundvaluesinShaanxiProvince,respectively.SignificantlypositivecorrelationwasfoundbetweenCdandPbinsoils,wh
6、ilehighlysignificantpositivecorrelationwasfoundamongCr,CuandZn,respectively.TheprincipalcomponentanalysisshowedCdandPbinsoilswereassociatedwithanthropogenicactivities,whereasCr,CuandZnwerepredominantlycontrolledbyparentmaterial.Thequalityofsoilswereevaluatedwithpotentialecolo
7、gicalriskindexandNemerowpollutionindex,however,bothoftheresultsshowedthatCdwasthemajorpollutionelementinsoil.Inthestudyareas,exceedingratesofCrandPbinwheatsampleswereupto70.00%and80.00%,respectively;exceedingratesofCd,Cr,Pbinfruitvegetablesampleswere66.67%,100%and66.67%,respe
8、ctively;andexceedingratesofCd,Cr,Pbinflowerandleafvegetablessamplesw
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