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长白山温带森林生态系统磷循环对氮添加的响应.docx

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长白山温带森林生态系统磷循环对氮添加的响应 Title:ResponseofPhosphorusCyclingintheTemperateForestEcosystemofChangbaiMountaintoNitrogenAddition Abstract: TheChangbaiMountainregioninnortheasternChinasupportsadiverseandfragiletemperateforestecosystem.Understandingtheresponseofthephosphorus(P)cycleinthisecosystemiscrucialformanagingandpreservingthisimportantnaturalresource.Thispaperaimstoexploretheeffectofnitrogen(N)additiononPcyclingintheChangbaiMountaintemperateforestecosystem.Acomprehensivereviewoftheexistingliterature,fieldstudies,andlaboratoryexperimentswasconductedtoexaminethemechanismsandimplicationsofN-inducedchangesinPavailability,uptake,andredistributionwithintheecosystem. Introduction: TheChangbaiMountainregionpossessesahighlyproductivetemperateforestecosystemthatplaysavitalroleinregionalandglobalcarboncyclingandconservationofbiodiversity.Phosphorusisanessentialnutrientforplantgrowthandecosystemfunctioning,anditscyclingiscloselylinkedtonitrogendynamics.Humanactivities,suchasthedepositionofatmosphericnitrogenfromindustrialactivitiesandagriculturalpractices,haveresultedinincreasedNavailabilityinmanyecosystemsglobally.Consequently,itisimperativetounderstandtheimplicationsofNdepositiononPcyclingintheChangbaiMountaintemperateforestecosystemtoensureitssustainablemanagement. Methods: ToinvestigatetheresponseofPcyclingtoNaddition,fieldexperimentswereconductedinrepresentativeforestplotswithintheChangbaiMountainregion.Nwasappliedatdifferentrates,includingcontrolplotswithnoNaddition.Soilsampleswerecollectedatvaryingdepths,andplantsampleswereobtainedforanalysisofPconcentrationsandcarbon:nitrogen:phosphorusratios.Thesemeasurements,coupledwithmicrobialenzymeactivitiesandlitterdecompositionrates,providedinsightsintothechangesinPcyclingdynamicsinresponsetoNaddition. Results: TheresultsindicatedthatNadditionhadasignificantimpactonPcyclingwithintheChangbaiMountaintemperateforestecosystem.IncreasedNdepositionledtoadeclineinsoilPavailabilityduetoenhancedimmobilizationcausedbyincreasedplantgrowth,micr