An analysis of soil respiration across northern hemisphere temperate ecosystems

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1、Biogeochemistry(2005)73:29–70ÓSpringer2005DOI10.1007/s10533-004-2946-0-1Ananalysisofsoilrespirationacrossnorthernqhemispheretemperateecosystems1,2,*111K.A.HIBBARD,B.E.LAW,M.REICHSTEINandJ.SULZMAN1OregonStateUniversity,ForestScience,304RichardsonHall,Corvallis,OR97331,USA;2NationalCent

2、erforAtmosphericResearch,Box3000,Boulder,Co80303,USA;*Authorforcorrespondence(e-mail:kathy.hibbard@oregonstate.edu)Keywords:Arrheniusmodel,Bioticcontrols,Ecosystemmodelling,Environmentalcontrols,Labilecarbon,SoilrespirationAbstract.Overtwo-thirdsofterrestrialcarbonisstoredbelowgrounda

3、ndasignificantamountofatmosphericCO2isrespiredbyrootsandmicrobesinsoils.Forthisanalysis,soilrespiration(Rs)datawereassembledfrom31AmeriFluxandCarboEuropesitesrepresentingdeciduousbroadleaf,evergreenneedleleaf,grasslands,mixeddeciduous/evergreenandwoodland/savannaecosystemtypes.Lowestto

4、highestratesofsoilrespirationaveragedoverthegrowingseasonweregrasslandandwoodland/savanna

5、ionratesduringthegrowingseasonvariedfromMarch/AprilingrasslandstoJuly–Septemberforallotherbiomes.Biomeswithoverallstrongestrelationshipbetweensoilrespirationandsoiltemperaturewerefromthedeciduousand2mixedforests(R‡0.65).Maximumsoilrespirationwasweaklyrelatedtomaximumfineroot22biomass(R

6、=0.28)andpositivelyrelatedtothepreviousyears’annuallitterfall(R=0.46).PublishedratesofannualsoilrespirationwerelinearlyrelatedtoLAIandfinerootcarbon22(R=0.48,0.47),aswellasnetprimaryproduction(NPP)(R=0.44).At10sites,maximumgrowingseasonRswasweaklycorrelatedwithannualGPPestimatedfromedd

7、ycovariance2towersites(R=0.29;p<0.05),andannualsoilrespirationandtotalgrowingseasonRswerenotcorrelatedwithannualGPP(p>0.1).Yet,previousstudiesindicatecorrelationsonshortertimescaleswithinsite(e.g.,weekly,monthly).EstimatesofannualGPPfromtheBiome-BGCmodel2werestronglycorrelatedwithobse

8、rveda