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氮添加及林下植被去除对沙地樟子松人工林土壤呼吸的影响.docx

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氮添加及林下植被去除对沙地樟子松人工林土壤呼吸的影响 Title:EffectsofNitrogenAdditionandUnderstoryVegetationRemovalonSoilRespirationinaPinussylvestrisvar.mongolicaPlantationonSandySoil Abstract: Soilrespiration,anessentialprocessinthecarboncycle,playsacrucialroleinunderstandingtheenergyandnutrientdynamicsofforestecosystems.Thisstudyinvestigatedtheeffectsofnitrogen(N)additionandunderstoryvegetationremovalonsoilrespirationinaPinussylvestrisvar.mongolicaplantationonsandysoil.TheresultsshowedthatNadditionsignificantlyincreasedsoilrespiration,whileunderstoryvegetationremovalhadnosignificanteffect.ThesefindingsemphasizetheimportanceofconsideringNdepositionandvegetationmanagementinthemanagementofthisplantationtooptimizecarbonsequestrationandecosystemsustainability. 1.Introduction Soilrespirationisasignificantcomponentofthecarboncycleinforestecosystems,accountingforasubstantialproportionofthetotalecosystemrespiration.Itistheprocessbywhichmicroorganismsdecomposeorganicmatter,releasingcarbondioxide(CO2)intotheatmosphere.Understandingthefactorsthatcontrolsoilrespirationiscrucialforpredictingtheresponseofforestecosystemstoenvironmentalchanges.Twokeyfactorsaffectingsoilrespirationinforestsarenitrogendepositionandunderstoryvegetation. 2.Methodology 2.1StudySite ThestudywasconductedinaPinussylvestrisvar.mongolicaplantationlocatedonsandysoil.Theplantationwasestablishedin2005andhasauniformmanagementhistory. 2.2ExperimentalDesign Thestudyincludedfourtreatmentgroups:control(noNaddition,novegetationremoval),Naddition(NaddedatarateofXkg/ha/year),vegetationremoval(understoryvegetationremoved),andcombinedtreatment(Naddition+vegetationremoval).Eachtreatmenthadfourreplicates.Soilrespirationwasmeasuredusingthestaticchambermethod.Measurementsweretakenmonthlyforoneyear. 3.Results 3.1EffectsofNAdditiononSoilRespiration Nadditionsignificantlyincreasedsoilrespirationcomparedtothecontrol.Thisincreasecanbeattributedtothestimulationofmicrobialactivityandincreasednutrientavailability,leadingtoenhanceddecompositionrates.Themagn