2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、Y9n637‘類號∞們78南京林業(yè)大學(xué)學(xué)柱代碼1029803(X)15研究生碩士學(xué)位論文論立題目作者專業(yè)研究方向指導(dǎo)教師絮屯話LMe乩sotiztl畸南k氯杜茴DDT日襲土壤的修復(fù)研完王^虹植物學(xué)班育生物學(xué)周堅救授AbstractTheresidualconceⅡtrationsofDichloro—diphenyl—trichloroethane(DDT)onekindofOrganochlorinepesticides,inthes

2、oilofdifferentsitesinNanjingwereinvestigated;theaccumulationmechanismandcapacityinMedicagosativatoDDTsincontaminatedsoilwerepreliminarystudiedthroughtheexperimentcultivatedinpotEffectsofaddingsurfactantandchangingpHvalue

3、onaccumulatingcapacityofMedicagosativawasresearched;theantioxidantenzymesactivitiesandMDAcontentsintheleavesofMedicagosativaindifferentdevelopstageweretested,indicatingthatMedicagosativaexhibitedahigherenduranceabilities

4、toDDTsandcouldbeusedforremediationofDDTscontaminatedsoilTheresultswereasfollows:(1)OrganochlorinepesticidesDDTswasfoundinsoilsofalltheselectedsitesinNanjingcityandtheresidueamountwasrangefrom0148tOO26mg/kgMaybetherewasne

5、wlyaddedDDTsinthesoilofselectedsites(2)TheconcentrationsofDDTsinMedicagosativaexhibitedatrendofincreasedecreaseincreasewhen05mg/kgDDTswassuppliedinthesoil,themaximconcentration206垤wasreachedafter105daystreatment;when24mg

6、/kgDDTswassuppliedinthesoil,theabsorptionandaccumulationofDDTsinMedicagosativaincreasedatthebeginningstageanddecreasedlater,themaximconcentrationof10301Xgwasachievedafter90daystreatmentatthesametime,057~068percentoftotal

7、amountofDDTswastransportedfromsoiltoMedicagosativarespectivelyTheabsorptiveabilitiestoDDTsvariedindifferentpartsofMedicagosativaandtherootsplayedapredominantroleTheRoots/Shoots(dryweight)DDTsqualityreachedthemaxim161when

8、O5mg/kgDDTsweresuppliedinthesoilbutitreachedthemaxim1081when24mg/kgDDTsweresuppliedinthesoil(3)BoththesurfactantSodiumlaurylsuifonate(SLS)andCetyltrimethylAmmoniumBromide(CTAB)atdifferentdosecouldpromotetheDDTsaccumulati

9、onbyMedicagosativa,andSLSwasmoreefficientthanCTABTheaccumulationabilityofMedicagosativatoDDTswasincreasedat15mg/kgconcentrationofNaHCOsinthesoil,butdecreasedatO5mg/kglevel,with30mg/kgNaHC03addedinthesoil,couldimprovetheD

10、DTsaccumulationinshootsbutinhibititsaccumulationinroots(4)NosignificantchangeswereobservedforthebiomassofMedicagosativawhentreatedwithvariousconcentrationsofDDTs,butsomephysiologicalindexhadbeenchangedTheSODandPODactivit

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