46-Landscape topography structures the soil microb

46-Landscape topography structures the soil microbiome in arctic polygonal tundraARTICLELandscapetopographystructuresthesoilmicrobiomeinarcticpolygonaltundraNeslihanTaş1,EmmanuelPrestat1,2,ShiWang1,YuxinWu1,CraigUlrich1,TimothyKneafsey1,SusannahG.Tringe3,MargaretS.Torn1,4,SusanS.Hubbard1&JanetK.Jansson5IntheArctic,environmentalfactorsgoverningmicrobialdegradationofsoilcarbon(C)inactivelayerandpermafrostarepoorlyunderstood.HerewedeterminedthefunctionalpotentialofsoilmicrobiomeshorizontallyandverticallyacrossacryoperturbedpolygonallandscapeinAlaska.Withcomparativemetagenomics,genomebinningofnovelmicrobes,andgasfluxmeasurementsweshowthatmicrobialgreenhousegas(GHG)productionisstronglycorrelatedtolandscapetopography.Activelayerandpermafrostharborcontrastingmicrobiomes,withincreasingamountsofActinobacteriacorrelatingwithdecreasingsoilCinpermafrost.Whilemicrobialfunctionssuchasfermentationandmethanogenesisweredominantinwetterpolygons,indrierpolygonsgenesforCmineralizationandCH4oxidationwereab