简介：TheeffectsofcombinedheavymetalpollutionofredsoilonthegrowthofwetlandriceandthetransferofPb,Cd,CuandZnfromsoilintoplantsweresudiedbygreenhousepotexperiment,Theresultsshowedthattheplantyieldsweremarkedlyaffectedbyheavymetals,withtheexceptionofPb,insoilsundertheexperimentalconditions,withouttakingintoconsiderationalltheinteractionsamongtheelements.Theconcentrationsoftheelemetsinplantsweremainlyaffectedbythespecificelementaddedtothesoil.Theeffectofinteractionsamongtheheavymetalswasverysignificanteitheronplantyieldsorontheconcentrationoftheelementsinplants.Theriskassessmentofacombinedpollutionbyheavymetalsinthesoilisdiscussedpreliminarilyintermsoftherelativepollutionequivalent.

简介：AfieldexperimentwasconductedtostudytheeffectsofPb,Cd,Cu,ZnandAscoexistinginredsoilongrowthofrice(OryzasativaL.)mungbean(Vignarabiata(Linn.)Wilczek),alfalfa(MedicagosativaL.),Slashpine(PinuselliottiiEngelm.)andaspen(PopulusL.).Resultsshowedthatrice,mungbeanandalfalfaweresignificantlyinfluencedbycombinedpoollutionoftheheavymetals,thecontentsofPb,CdandAsinricegrainsgreatlyexceededtheNationalStandardsforFoodHygieneofChina.Heavymetalsatahighconcentrationseriouslyretardedgrowthofmungbeanandalfalfa,butnotsoobviouslywithslashpineandaspen.Thecompositeindexissuggestedforevaluatingtherelativityofcombinedpollutionwithheavymetalsinsoil.

简介：IndividualandcombinedeffectsofCu,Pb,ZnandCdonNmineralization,ureaseandphosphatasewereexaminedinaTypicUdicFerrisolinlaboratorybyemployinganduniformdesignandasinglefactordesign,SoilpollutioncausedbyheavymetalsinhibitedNmineralization(N0value)andureaseandphosphataseactivities.ThecombinedpollutionofmetalsalleviatedtheirtoxicitytoNmineralizationtosomeextentwhereasaggravatedthetoxicitytoureaseandphosphatase.Phosphorousapplicationcouldmitigatthetoxiceffectofheavymetalsonphosphataseactivities,whilealleviatingeffectofNapplicationonthetoxicityofheavymetalstoureasewasinconsistent.However,themitigatingeffectofthefertilizerswaslimitedinheavilypollutedsoils.

简介：Organicamendmentssuchasvermicompostandbiocharhavebeenreportedtoenhancesoilfertilityandcropproductivity.However,whethertheco-applicationofbothamendmentshassynergisticeffectsorwhethersuchbenefitsareaccompaniedbytheriskofgaseousnitrogen(N)lossinanagroecosystemremainsunknown.Asoilcolumnexperimentwithafullyfactorialdesignwasconductedusingthreelevelsofvermicompost(nodose,lowdose(1%,weight:weight),andhighdose(3%,weight:weight))withoutorwithbiochar(1%,weight:weight)toinvestigatetheireffectsonricegrowthandgaseousNlossacrossthecropgrowingseason.Ourresultsdemonstratedthatsynergisticinteractionsexistedbetweenvermicompostandbiocharinpromotingcropyield.Comparedwithbiocharamendmentalone,biocharcombinedwithvermicompostsignificantly(P<0.01)increasedriceyieldby26.5%–35.3%.However,highdoseofvermicompostsignificantly(P<0.01)increasedthecumulativeammonia(NH3)andnitrousoxide(N2O)emissions.Inthepresenceofvermicompost,theincorporationofbiocharamendmentsignificantly(P<0.01)decreasedthecumulativeN2Oemissionby14.1%–18.6%.ThelowestemissionfactorvalueofNH3andN2Owasachievedusingbiocharincombinationwithlowdoseofvermicompost.Thisstudyrevealedthatthecombinationofbiocharandmoderatedoseofvermicompostoffersanovelapproachtopromotecropproductivitywhilereducingtheenvironmentalrisk.