SoilRespirationinEuropeanGrasslandsinRelationtoClimaSoilRespirationinEuropeanGrasslandsinRelationtoClimateUKPMCFundersGroupAuthorManuscriptEcosystems.Authormanuscript;availableinPMC2021October7.Publishedinfinaleditedformas:Ecosystems.2021December;11(8):1352–1367.doi:10.1007/s10021-008-9198-0.UKPMCFundersGroupAuthorManuscriptUKPMCFundersGroupAuthorManuscriptSoilRespirationinEuropeanGrasslandsinRelationtoClimateandAssimilateSupplyMichaelBahn1,*,MircoRodeghiero2,MargaretAnderson-Dunn3,SabinaDore4,CristinaGimeno5,MatthiasDrsler6,MichaelWilliams7,ChristofAmmann8,FrankBerninger9,ChrisFlechard8,StephanieJones3,ManuelaBalzarolo4,SureshKumar7,ChristianNewesely1,TiborPriwitzer10,AntonioRaschi11,RolfSiegwolf12,SannaSusiluoto10,JohnTenhunen6,GeorgWohlfahrt1,andAlexanderCernusca11InstituteofEcology,UniversityofInnsbruck,Sternwartestr.15,6020Innsbruck,Austria2CentrodiEcologiaAlpina-FondazioneEdmundMach,38040ViotedelMonteBondone,Trento,Italy3CentreforEcologyandHydrologyEdinburgh,BushEstate,Penicuik,MidlothianEH260QB,UnitedKingdom4DepartmentofForestScienceandEnvironment,UniversityofTuscia,ViaS.CamillodeLellis,Viterbo01100,Italy5FundacinCentrodeEstudiosAmbientalesdelMediterrneo,ParqueTecnolgicoC/CharlesR.Darwin14,Paterna,Valencia46980,Spain6DepartmentofPlantEcology,UniversityofBayreuth,Universittsstrae30,Bayreuth95440,Germany7DepartmentofBotany,SchoolofNaturalScience,TrinityCollege,UniversityofDublin,Dublin2,Ireland8FederalResearchStationforAgroecologyandAgriculture,Reckenholzstr.191,Zrich8046,Switzerland9DepartmentofForestEcology,UniversityofHelsinki,Latokartanonkaari7,P.O.BOX27,Helsinki00014,Finland10NationalForestCentre-ForestResearchInstitute,Zvolen96092,Slovakia11ConsiglioNazionaledelleRicerche,ViaGiovanniCaproni,Firenze50145,Italy12Paul-ScherrerInstitute,VilligenPSI5232,SwitzerlandAbstractSoilrespirationconstitutesthesecondlargestfluxofcarbon(C)betweenterrestrialecosystemsandtheatmosphere.Thisstudyprovidesasynthesisofsoilrespiration(Rs)in20Europeangrasslandsacrossaclimatictransect,includingtenmeadows,eightpasturesandtwounmanagedgrasslands.MaximumratesofRs(Rsmax),Rsatareferencesoiltemperature(10C;Rs10)andannualRs(estimatedfor13sites)rangedfrom1.9to15.9μmolCO2m2s1,0.3to5.5μmolCO2m2s1and58to1988gCm2y1,respectively.ValuesobtainedforCentralEuropeanmountainmeadowsareamongstthehighestsofarreportedforanytypeofecosystem.AcrossallsitesRsmaxwascloselyrelatedtoRs10.AssimilatesupplyaffectedRsattimescalesfromdaily(butnotnecessarilydiurnal)toannual.ReductionsofassimilatesupplybyremovalofabovegroundbiomassthroughgrazingandcuttingresultedinarapidandasignificantdecreaseofRs.Temperature-independentseasonalfluctuationsofRsofanintensivelymanagedpasturewerecloselyrelatedtochangesinleafareaindex(LAI).AcrosssitesRs10increasedwithmeanannualsoiltemperature(MAT),LAIandgrossprimaryproductivity(GPP),indicatingthatassimilatesupplyoverridespotentialacclimationtoprevailingtemperatures.AlsoannualRswascloselyrelatedtoLAIandGPP.BecausethelattertwoparameterswerecoupledtoMAT,temperaturewasasuitablesurrogateforderivingestimatesofannualRsacrossthegrasslandsstudied.ThesefindingscontributetoourunderstandingofregionalpatternsofsoilCfluxesandhighlighttheimportanceofassimilatesupplyforsoilCO2emissionsatvarioustimescales.2021SpringerScience+BusinessMedia,LIC*Correspondingauthor;michael.bahn@uibk.ac.at.SoilRespirationinEur...