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1、Biogeochemistry(2005)73:3–27ÓSpringer2005DOI10.1007/s10533-004-5167-7-1Interpreting,measuring,andmodelingsoilrespiration1,2,3MICHAELG.RYAN*andBEVERLYE.LAW1USDepartmentofAgriculture-ForestService,RockyMountainResearchStation,240WestPros-2pectStreet,FortCollins,CO80526,USA;AffiliateFacu
2、lty,DepartmentofForest,RangelandandWatershedStewardshipandGraduateDegreePrograminEcology,ColoradoStateUniversityFort3Collins,CO80523,USA;DepartmentofForestScience,OregonStateUniversity,328RichardsonHall,Corvallis,OR97331,USA;*Authorforcorrespondence(e-mail:mgryan@fs.fed.us)Keywords:
3、Belowgroundcarbonallocation,Carboncycling,Carbondioxide,CO2,Infraredgasanalyzers,Methods,Soilcarbon,TerrestrialecosystemsAbstract.Thispaperreviewstheroleofsoilrespirationindeterminingecosystemcarbonbalance,andtheconceptualbasisformeasuringandmodelingsoilrespiration.Wedevelopedittopr
4、ovidebackgroundandcontextforthisspecialissueonsoilrespirationandtosynthesizethepresentationsanddiscussionsattheworkshop.Soilrespirationisthelargestcomponentofecosystemrespiration.Becauseautotrophicandheterotrophicactivitybelowgroundiscontrolledbysubstrateavailability,soilrespiration
5、isstronglylinkedtoplantmetabolism,photosynthesisandlitterfall.Thislinkdominatesbothbaseratesandshort-termfluctuationsinsoilrespirationandsuggestsmanyrolesforsoilrespirationasanindicatorofecosystemmetabolism.However,thestronglinksbetweenaboveandbelowgroundprocessescomplicateusingsoilr
6、espirationtounderstandchangesinecosystemcarbonstorage.Rootandassociatedmycorrhizalrespirationproduceroughlyhalfofsoilrespiration,withmuchoftheremainderderivedfromdecompositionofrecentlyproducedrootandleaflitter.Changesinthecarbonstoredinthesoilgenerallycontributelittletosoilrespirat
7、ion,butthesechanges,togetherwithshiftsinplantcarbonallocation,determineecosystemcarbonstoragebelowgroundanditsexchangewiththeatmosphere.Identifyingthesmallsignalfromchangesinlarge,slowcarbonpoolsinfluxdominatedbydecompositionofrecentmaterialandautotrophicandmycorrhizalrespirationisas
8、ignificantchallenge.
