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38-Microbial change in warming soils.

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  • 2019-03-20 12:39:12

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38-Microbial change in warming soils.SCIENCEsciencemag.orgGRAPHIC:K.SUTLIFF/SCIENCEByDanielB.MetcalfeSoilsarethelargestsingleterrestrialsourceofcarbondioxide(CO2),buttheseemissionsarehighlysensitivetoarangeoffactorsassociatedwithclimatechangeandhumanlanduse(1).ResearchershavelongsoughttobetterunderstandtheunderlyingdriversofsoilCO2emissions,butthedurationofexperimentsisalltoooftenconstrainedbyprojectdeadlinesandpersonnelcontracts,hamperingourabilitytounderstandandpredictthemanygradualbutimportantprocessesthatoccurinsoils(2).Onpage101ofthisissue,Melilloetal.(3)reportonanintriguing26-yearrecordofsoilrespirationresponsestowarminginatemperateforest.Theresultsfromthisunusuallylongtimeserieshighlightboththepotentialpitfallsofdrawinghastyconclusionsfromshort-termstudiesandtheimportanceoflong-termexperimentsinecosystemandclimatescience.Shiftsintheterrestrialcarbonstore,ofwhichsoilsconstitutearound70%,areoneofthemostimportantbutleastunder-stooddriversofvariationinatmosphericCO2levels(4,5).Soilc

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