12-Microbial control of soil organic matter minera

12-Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatmentsMicrobialcontrolofsoilorganicmattermineralizationresponsestolabilecarboninsubarcticclimatechangetreatmentsKATHRINROUSK1,2,ANDERSMICHELSEN1,2andJOHANNESROUSK31TerrestrialEcologySection,DepartmentofBiology,UniversityofCopenhagen,Universitetsparken15,2100Copenhagen,Denmark,2CenterforPermafrost(CENPERM),UniversityofCopenhagen,ØsterVoldgade10,1350Copenhagen,Denmark,3SectionofMicrobialEcology,DepartmentofBiology,LundUniversity,22362Lund,SwedenAbstractHalftheglobalsoilcarbon(C)isheldinhigh-latitudesystems.ClimatechangewillexposethesetowarmingandashifttowardsplantcommunitieswithmorelabileCinput.LabileCcanalsoincreasetherateoflossofnativesoilorganicmatter(SOM);aphenomenontermed‘priming’.Weinvestigatedhowwarming(+1.1°Coverambientusingopentopchambers)andlitteraddition(90gm�2yr�1)treatmentsinthesubarcticinfluencedthesusceptibilityofSOMmineralizationtopriming,anditsmicrobialun