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1、第24卷第3期水土保持学报Vol.24No.32010年6月JournalofSoilandWaterConservationJun.,2010*作物间作对油菜积累镉与铅的影响1,2221向言词,官春云,黄璜,彭秀花(1.湖南科技大学生命科学学院,湖南湘潭411201;2.湖南农业大学油料作物研究所,湖南长沙410128)摘要:采用盆栽试验,研究了与黑麦草(Loliumperenne)及紫云英(Astragalussiniucus)间作对芥菜型油菜(Bras2sicajuncea)和甘蓝型油菜(B.n
2、apus)积累镉与铅的影响。结果表明:单种和混种紫云英显著增加土壤氮,单种和混种油菜及黑麦草显著降低土壤氮。栽培植物增加土壤的碱解氮、速效磷、速效钾和有机质,单种紫云英显著降低土壤pH值。间作时,两种油菜的生物量显著增加,其SOD活性显著降低,黑麦草和紫云英的SOD活性显著增加,两种油菜的镉和铅含量显著降低,黑麦草和紫云英的根部的镉和铅含量显著增加,两种油菜地上部和根部的镉与铅的生物富集系数显著下降,黑麦草和紫云英的根部的镉和铅的生物富集系数显著增加。因此,与黑麦草及紫云英间作可减少油菜积累镉与铅,降
3、低重金属对人类危害。关键词:油菜;镉;铅;间作中图分类号:X53文献标识码:A文章编号:100922242(2010)0320050206EffectsofIntercroppingonAccumulationofCdandPbinOilseedRape1,2221XIANGYan2ci,GUANChun2yun,HUANGHuang,PENGXiu2hua(1.SchoolofLifeScience,HunanUniversityofScienceandTechnology,Xiangtan4112
4、01;2.ChinaInstituteofOilCrops,HunanAgriculturalUniversity,Changsha410128)Abstract:Apotexperimentwasconductedtoinvestigatetheeffectof2intercropsonCdandPbuptakebytwooilseedrapespecies,BrassicajunceaandB.napus.Theintercropsincludedryegrass(Loliumperenne)an
5、dChinesemilkvetch(Astragalussiniucus).Monocroppedandintercroppedchinesemilkvetchsignificantlyincreasedsoiltotalnitrogen.Monocroppedandintercroppedoilseedrapesandryegrasssignificantlydecreasedsoiltotalnitrogen.SoilavailableN,P,K,andorganicmatterincreased
6、withmonocroppingandintercrop2pingtheseplants.SoilpHsignificantlydecreasedwithplantingChinesemilkvetchalone.Intercroppingsig2nificantlyincreasedbiomassforbothoilseedrapes.SODactivityofseedling,contentsofCdandPbintissuesandbioconcentrationfactorofbothmeta
7、lsweregreatlydecreasedforbothoilseedrapesintercroppedwithryegrassandChinesemilkvetch.IntercroppinggreatlyincreasedSODactivityofseedling,CdandPbcon2tentsinroot,andbioconcentrationfactorofmetalsinrootforryegrassandChinesemilkvetch.Theresultssuggestedthati
8、ntercroppingmightbeafeasibletoolindecreasingaccumulationofCdandPbbyoilseedrapeandreducingtheriskofmetalstohumanbeings.Keywords:oilseedrape;cadmium;lead;intercropping72我国受Cd、Pb等重金属污染的耕地面积近2.0@10hm,对大面积受中、低度重金属污染的土壤实行休耕会影响粮食生产,这在我国
