紫云英水溶性有机物促进淹水土壤中五氯酚还原与铁还原-柳勇
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2020-02-21 10:24:22
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摘要:以潜育水耕人为土为供试土壤,以不同的处理方式和培养时间下产生的紫云英水溶性有机物(DOM)为添加物(包括新鲜紫云英DOM、淹水腐解7d和14d紫云英DOM、好气腐解7d和14d紫云英DOM;800mgC·L-1),研究了5种DOM作为有机碳源促进淹水土壤中五氯酚(PCP)还原转化与Fe(Ⅱ)累积的关系。结果表明,紫云英DOM在淹水6.5d后均可显著促进PCP的还原(P<0.05),淹水2d后显著促进了乙酸钠提取态Fe(Ⅱ)[Fe(Ⅱ)NaOAc]和乙酸钠+盐酸连续提取态Fe(Ⅱ)[Fe(Ⅱ)NaOAc+HCl]的累积(P<0.05);多数情况下还可促进乙酸钠提取态Fe(Ⅲ)[Fe(Ⅲ)NaOAc]的累积;多元线性回归分析发现,PCP还原主要受Fe(Ⅱ)NaOAc+HCl影响,其逐步回归模型为:PCP(mg·kg-1)=22.95-0.047Fe(Ⅱ)NaOAc+HCl(mg·kg-1)(R2=0.615,P<0.01)。因此,DOM促进了淹水土壤中PCP还原与铁还原,Fe(Ⅱ)累积是导致PCP还原转化的主要化学机制。关键词:紫云英;水溶性有机物;潜育水耕人为土;五氯酚;活性铁形态;连续提取;逐步回归模型中图分类号:S153文献标志码:A文章编号:1672-2043(2014)04-0687-08doi:10.11654/jaes.2014.04.010紫云英水溶性有机物促进淹水土壤中五氯酚还原与铁还原柳勇1,于雄胜2,李芳柏1*,徐建明2*,楼骏3,刘传平1(1.广东省生态环境与土壤研究所,广东省农业环境综合治理重点实验室,广州510650;2.浙江大学紫金港校区环境与资源学院,土水资源与环境研究所,杭州310058;3.福建农林大学资源与环境学院,福州350002)DissolvedOrganicMatterfromChineseMilkVetch(AstragalussinicusL.)EnhancesPentachlorophenolReductiveTransformationandIronReductioninaFloodedPaddySoilLIUYong1,YUXiong-sheng2,LIFang-bai1*,XUJian-ming2*,LOUJun3,LIUChuan-ping1(1.GuangdongKeyLaboratoryofAgro-EnvironmentIntegratedControl,GuangdongInstituteofEco-EnvironmentalandSoilSciences,Guangzhou510650,China;2.InstituteofSoilandWaterResourcesandEnvironmentalScience,CollegeofEnvironmentalandResourceSci-ences,ZijingangCampus,ZhejiangUniversity,Hangzhou310058,China;3.CollegeofResourceandEnvironmentalSciences,FujianAgricul-tureandForestryUniversity,Fuzhou350002,China)Abstract:Thisstudyinvestigatedtheeffectsofdissolvedorganicmatter(DOM)fromgreenmanureonpentachlorophenol(PCP)reduc-tivetransformationandFe(Ⅲ)reductionunderfloodedsoilconditions.BatchexperimentswereconductedtoexplorethekineticsofPCPreductivetransformationanditsrelationshipwithFe(Ⅱ)accumulationinafloodedpaddysoil(Gleyi-StagnicAnthrosol)amendedwithfreshordecomposed(continuously-flooded,CFornon-flooded,NF;7and14d)DOMfromChinesemilkvetch(AstragalussinicusL.,CMV;800mgC·L-1).The5treatmentsofCMV-derivedDOM(CMV-DOM)significantlyenhancedthereductivetransformationofPCPandtheaccumulationofNaOAc-extractableorsequentialNaOAc-andHCl-extractable
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