蚯蚓稻秸污泥堆置体系对污泥肥效与重金属生物有效性的影响

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1、金属含量明显高于生菜叶部；随着污泥或蚓粪施用量增加，生菜叶部和根部重金属含量先增加后降低。当污泥或蚓粪施加量为209·k91(土)时，生菜叶部和根部重金属含量最低，且施加蚓粪的低于施加污泥的。5．施用污泥或蚓粪均能降低收获生菜后土壤的pH值，随着污泥或蚓粪施用量的增加，土壤pH值逐渐降低，而土壤EC、有机质、TN、TP和TK含量均随之增加。6．当蚓粪施用量为209·k91(土)时，收获生菜后土壤中重金属Zn、Cu、Pb、Ni、Cd和Cr含量均比其它处理要低，对后期种植作物影响较小。7．收获生菜后土壤中磷酸酶、脲酶、过氧化氢酶的活性，随着污泥或蚓粪施用量增加而逐渐

2、增强；与旌用污泥相比，施用等量蚓粪更能提高以上三种酶的活性，其中，磷酸酶的活性增幅最大。关键词：蚯蚓堆肥；城市生活污泥；稻秸；重金属；生菜ⅡEffectofVermicompostingwithRiceStrawonFertilityandHeavyMetalBioavailabilityofSewageSludgeAbstractWiththeincreaseinurbanpopulationandurbansewagetreatmentrate，theamountofmunicipalsewagesludgehasbeengraduallyincreased

3、．Thesewagesludgeutilizationhasawidespreadconcern．TheuseofearthworminsludgetreatmentoftenreferstoIllsvermieomposting．Inthispaper,ricestrawasaconditionerinthesewagesludge，investigationsweremadetoexploretheeffectonsludgenutrientcontent，heavymetalsanditsformsaftertreatmentbyearthworms(ie

4、，earthwormEisenuiafaetida)．Potexperimentswerestudiedthedifferentproportionsafterapplyingsewagesludgevermicompostoncrops(1ettuce)yield，quality,heavymetalscontentsandthephysicochemicalpropertiesofthesoilafterharvestcrops．Themainresultsareasfollows：’1．TheparameterssuchaspH，organicmatter

5、,thecontentsofNH4+_Nand玛eldahlnitrogen(TN)decreasedafterverrnicomposting,whiletheconductivity,thecontentsofN03一一N，availableETPandavailableKincreased．Itindicatesthatearthwormscouldenhancethefertilityofthesludge．2．Thefinalresultindicatedthatthetotalconcentrationofheavymetalsanditsbio．c

6、oncentrationdecreasedaftervermieomposting,andwiththeaddedamountofricestrawincreasegraduallydecreased．Thecontentofheavymetalsanditsbio—concentrationisthebiggestdecline，whenricestrawinthe20％ofthetotalweight(dryweight)．ThepresentstudyshowedearthwormsCanchangethebioavailabilityofheavymet

7、alsinsewagesludge，andheavymetalsfromthesludgeaftertreatmenthasastabilizingeffect，andisnotconducivetocropuptake．3．Sewagesludgeorvermicompostamendedsoil，CallmakethelettuceproductionllI埘7删8川5Ⅲ9m4㈣0㈣2删Yincreases．Underthesameproportion，theapplicationofvermicompostincreasedthelettuceyieldm

8、oresignifica