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1、中国生态农业学报2008年5月第16卷第3期 ChineseJournalofEcoAgriculture,May2008,16(3):675-679DOI:10.3724/SP.J.1011.2008.00675受污农田中农作物对重金属镉的富集特征研究李铭红李侠宋瑞生(浙江师范大学生态研究所金华321004)摘要采用湿法消化法研究了浙江省不同地区农田污水灌溉后水体、土壤和多种农作物各器官的镉含量,2分析了土壤污染状况及农作物对重金属镉的富集特征。结果表明:污水和受污土壤镉含量极显
2、著相关(R=0.617,P<0.01)。不同农作物对镉的吸收程度不同,富集系数为紫云英>水稻>大豆>大麦>玉米>小麦。未受污染农作物和受污农作物根系及地上部镉含量差异明显,但镉富集系数差异不明显。同一农作物不同器官对镉的累积规律为根系>茎叶>果实。不同农作物果实的富集系数为紫云英>大麦>大豆>水稻>小麦>玉米。对几种农作物富集系数和吸收系数的比较发现,玉米和小麦根系及茎叶等营养器官富集镉的能力较强,但果实富集量却很低。6种农作物对镉的转移系数为玉米>大麦>紫云英>小麦>大豆>水稻,且转移系数介于0.50~0
3、.95之间,说明这几种农作物均对镉有很好的耐性。关键词镉农作物生物富集富集系数转移系数中图分类号:X503.231文献标识码:A文章编号:1671-3990(2008)03-0675-05Cadmiumaccumulationincropsgrowninpollutedfar1mlandsLIMingHong,LIXia,SONGRuiSheng(InstituteofEcology,ZhejiangNormalUniversity,Jinhua321004,China)Abstrac
4、tCdcontentofsewage,soi,laswellasroots,stems,leavesofdifferentcropsundersewageirrigationinanumberoffieldsacrossZhejiangProvincewerecalculatedusingwetdigestionmethodandCdaccumulationcharacteristicsofdifferentcropspresented.TheresultsshowthatCdcontentofsewag
5、eishigherthanthatofpollutedsoils,withapositiveandsignificantrelation2ship(R=0.617,P<0.01)betweensewageandpollutedsoi.lAccumulationcoefficientsofdifferentcropsisinfollowingorder:Astragalussinicus>Oryzasativa>Glycinemax>Hordeumvulgare>Zeamays>Triticumaestiv
6、um.CropCdcontentinpollutedandnonpollutedsoilsissignificantlydifferen,twhilethedifferenceinaccumulationcoefficientisinsignifican.tTheorderofaccumulationcoefficientforthedifferentorgansoftestedcropsis:root>stemandleaf>frui;tandthatforfruitsofdifferentcorps
7、is:A.sinicus>H.vulgare>G.max>O.sativa>T.aestivum>Z.mays.Comparisonofaccumulationandabsorptioncoefficientsamongthecropsindicatesthatnutrientorgans,suchasroo,tstemandleafofZ.maysandT.aestivumhavestrongerCdaccumulationcapacity,whilefruitsgenerallyaccumulatel
8、essCd.Theorderoftransfercoefficientsofcropsis:Z.mays>H.vulgare>A.sinicus>T.aestivum>G.max.>O.sativa.Cdtransfercoefficientofsixcropsis0.50~0.95,showingthatthesecropsareresistanttoCd.KeywordsCd,Crop,Bioaccumul
