三种碱性材料修复云南旱地土壤镐污染的化学机制

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中图分类号：X53 文献标志码：A 文章编号：1672-2043（2025）07-1721-11

doi：10.11654/jaes.2024-0733

Chemical mechanisms of three alkaline materials forremediation ofcadmium polution in dryland soils of Yunnan Province

CAI Cheng1，LIANG Ting1，ZHOU Guopeng²， CHANG Danna'，MA Zhengbo'，GAO Songjuan3，FULibo4， CAO Weidongl* （1.StateKeyLaboratoryofEfcietUlzationofAridandSemaridAableLandinorthnCina，ItituteofAgriculturalRsurcs andRegionalPlanning，ChineseAcademyofAgriculturalSciences，Beijing10o81，China;2.AnhuiProvinceKeyLabofFarland EcologicalCosevationdutrientUtilzation，AnuiProvinceEngieingndTcnlogReseachCnterofInteligntafacte andEficientUtlaionofGeeosposertlColleofsouesndEnviroentAnuiAgricultualUnivesityefei 230036，Ci;oudalialUsiti; of Agricultural EnvironmentandResources，Yunnan Academyof Agricultural Sciences，Kunming 65o2O5，China） Abstract：IndertosetpasivtoatealstoigateeltioofCd，oteperetifourtreaetsoflaool （CK），applicationofhydratedlime（HL），appicationofcalcium-magnesim-phosphorusfetilizer（CMP）ndapplicationof silicate calciumpowder（SC）wereconductedtoinvestigatetheefectsof threealkalinepasivationmaterialsonthechemicalstructureofsoil

DOM，theavailabilityofsoilCdandtheCdconcentratioofLctucsatiaL.TheresultsshowedthattheSCtreatmenthadthelowest aboveground Cd concentration and Cd translocation factor，with decreases of 38.8% and 30.4% .Compared with CK，HL，CMPand SC treatments reduced the availability of soil Cd and the soil available Cd concentration reduced by 11.2% ，26.7% and 17.9% ，exchangeable Cd by 15.5% ，14.9%and 28.1% ，and residual Cd by 21.0% ， 33.1% and 24.2% ， respectively. Three passivation materials treatments increasedsoilpgicantly.574n.3itsspetielyoaredto.oreoveplcatioofthaie materialssignificantlyincreasedsoilDcontent，umin-likefractiosandfulvic-likefractios，hiletetrytopan-likesubstances significantlydreasedcompaedtoCK.CorelationanalysisandaggregatedbostedtreeanalysisshowedtatsoilHassigniicantly andnegativelycorelaedwithsoilOMcontnt，soilDOMcontent，humin-likefractionsandfulvc-likefractionswerethetreemost criticalfactorsafectigCdconcetrationinteabovegoudCdconcentrationInconcusionthrealalineateasayrducete availabilitofsoilCdandibitthuptakeandtrasloationofCdinLctucsatiaLycreasingtesoilpHandchangingtotet andspectralcharacteristicsof thesoilDOM，mongwhichtheombinedefectofsilica-calciummineralpowderismoreproint. Kevwords：alkalinematerials：silicate-calciumpowder：Yunandrvland：dissolvedorganic mater：cadmiumpolutionremediation

重金属Cd在土壤中具有高度的累积性和持久性。（剩余18936字）