长江三角洲典型地区土壤.docxVIP

长江三角洲典型地区土壤-水稻系统中Cd的分布及其迁移制

约因素

陈岭啸;宋垠光;袁旭音;杨忠芳;陈旸;陈骏;季峻峰

【摘要】InordertofindtheCdpollutionandimpactfactorsonthemigrationinsoil-ricesysteminYangtzeRiverDeltaRegion.66groupsofsoil,riceshootandricegrainfromtypicalareaweresampled;contentsofheavymetalsandmajorelements,soilpH,soiltotalorganiccarbonofthosesamplesweremeasured;Cdpollutioninsoilandricegrainwereevaluatedbythemeansofrelevanceanalysis,andthedistributionofCdwereshown;impactsofsoilpHandorganiccarbon,andothermetalelementsonCdaccumulationinricewerediscussed.TheresultsshowedthatmassfractionofCdforthesoilsamplesintypicalareaofYangtzeRiverDeltaRegionwere(81.39-1441.00)x109withtheaverageof277.40x109,andthoseofthegrainsampleswere(10.44-692.40)x10-9withtheaverageof55.63x10-9;accordingtothesecondarylevelofSoilEnvironmentalQualityStandard(GB15618-1995),9.09%ofthesoilexceededthestandardlevelforCdcontent,andmostoftheCd-pollutedsampleswerefromSuzhou,ZhenjiangandChangzhou;accordingtoMaximumLevelsofContaminantsinFoodsStandard(GB2762-2005),4.55%ofricegrainsexceededthestandardlevelforCdcontent,andmostoftheCd-pollutedsampleswerefromSuzhouandWuxi;impactfactorsonCdaccumulationinriceweresoilpHandcontentsoftotalorganiccarbon,CaO,MgOandP;contentsofSandSewerecloselyrelatedwiththatofCd,andCdcooperatedwithZninrice,butcontentsofS,Se,ZninsoilhadnosignificantinfluenceonCdaccumulationinricesincreasingsoilpHandcontentoftotalorganiccarboncouldreduceCdaccumulationinrice,andincreasingcontentsofCaO,MgOandPinsoilcoulddecreaseCdabsorptioninacertainextent.%为了弄清楚长江三角洲土壤-水稻系统中Cd污染和迁移制约因素，采集了典型地区的水稻土壤、秸秆、籽实等样品共66组，测试了这些样品中重金属元素和常量元素的含量、土壤pH值和总有机碳含量等参数指标，并对这些参数进行相关性分析，评估水稻土壤与籽实中的Cd污染，探讨Cd空间分布，讨论土壤中pH值和有机质以及其他金属元素对Cd在水稻中积累的制约作用.结果表明:长江三角洲典型地区水稻土壤和籽实都存在Cd含