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1、PhysicalprotectionbysoilaggregatesstabilisesoilorganiccarbonundersimulatedNdepositioninasubtropicalforestofChinaXiao-lanZhonga,Jiang-taoLibCorrespondingauthor.Tel:+8615918779050E-mailaddress:ljtgzhu@163.com(J.-t.Li),Xiao-jiaLib,Yong-changYec,Song-songLiuc,PaulD.Hallettd,MuhammadN
2、aveedda.CollegeofNaturalResourcesandEnvironments,GuangdongProvinceKeyLaboratoryforLanduseandConsolidation,SouthChinaAgriculturalUniversity,483WushanRoad,Guangzhou,510642,Guangdong,PRChinab.SchoolofGeographicalSciences,GuangzhouUniversity,230WaihuanWestRoad,Guangzhou,510006,Guangd
3、ong,PRChinac.DongguanInstituteofForestryResearch,285XueyuanRoad,Dongguan,523106,Guangdong,PRChinad.InstituteofBiologicalandEnvironmentalSciences,UniversityofAberdeen,CruickshankBuilding,StMacharDrive,Aberdeen,AB243UU,UKCorrespondingauthor:Jiang-taoLiTel:+8615918779050Email:ljtgzh
4、u@163.com(J.t.Li)Postaladdresses:SchoolofGeographicalSciences,GuangzhouUniversity,230WaihuanWestRoad,Guangzhou,Guangdong,PRChina,51000642AbstractAtmosphericNdepositionhasincreaseddramaticallyinChinaduetorapidindustrial,agriculturalandurbandevelopment,greatlyaffectingcarboncycling
5、.WhilstCemissionsmayincreasebyelevatedNdeposition,limitationintheaccessibilityofsubstratestodecomposerswithinsoilaggregatesmaydampensoilmicrobialactivity,andtherebyphysicallyprotectorganiccarbonfromdecomposition.Inthisstudy,weexplorewhetherphysicalprotectionbysoilaggregatescoulds
6、tabilizesoilorganiccarbon,therebydampeningClossrates.Inthisstudy,additionalnitrogendepositionof0,50,100,200and300kgNha-1(3replicate10m×10mplotsofeach)wasappliedtoaSchimaplantationinsoutheastChina.SeveralsoilparametersandmicrobialbiomassCandNinbulksoil,aswellasindifferentsoilaggre
7、gatesizefractions(0.25-1mm,1-2mm,2-5mmand5-8mm)wereanalyzed.WithincreasingNdeposition,thetotalnitrogen(TN),electricalconductivity(EC)andNH4+-Nincreased,pHandC/Ndeclined,andsoilorganiccarbon(SOC)didnotchangebothinbulksoilandsoilaggregates.Inbulksoil,regressionanalysisrevealedthats
8、imulatedNdepositionledtoasignificantdecr
