2-Ectomycorrhizal fungi slow soil carbon cycling
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2019-03-20 12:38:46
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2-Ectomycorrhizal fungi slow soil carbon cyclingLETTEREctomycorrhizalfungislowsoilcarboncyclingColinAverill*andChristineV.HawkesDepartmentofIntegrativeBiologyUniversityofTexasatAustin,Austin,TX78712,USA*Correspondence:E-mail:caverill@bu.eduAbstractRespirationofsoilorganiccarbonisoneofthelargestfluxesofCO2onearth.Understandingtheprocessesthatregulatesoilrespirationiscriticalforpredictingfutureclimate.Recentworkhassuggestedthatsoilcarbonrespirationmaybereducedbycompetitionfornitrogenbetweensymbioticectomycorrhizalfungithatassociatewithplantrootsandfree-livingmicrobialdecom-posers,whichisconsistentwithincreasedsoilcarbonstorageinectomycorrhizalecosystemsglob-ally.However,experimentaltestsofthemycorrhizalcompetitionhypothesisarelacking.Hereweshowthatectomycorrhizalrootsandhyphaedecreasesoilcarbonrespirationratesbyupto67%underfieldconditionsintwoseparatefieldexclusionexperiments,andthislikelyoccursviacom-petitionforsoilnitrogen,aneffectlargerthan2°Csoilwarming.Thesefindingssupportmycor-rhiz
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