Vis enkel innførsel

dc.contributor.authorWild, Birgit
dc.contributor.authorSchnecker, Jörg
dc.contributor.authorKnoltsch, Anna
dc.contributor.authorTakriti, Mounir
dc.contributor.authorMooshammer, Maria
dc.contributor.authorGentsch, Norman
dc.contributor.authorMikutta, Robert
dc.contributor.authorAlves, Ricardo J. Eloy
dc.contributor.authorGittel, Antje
dc.contributor.authorLashchinskiy, Nikolay
dc.contributor.authorRichter, Andreas
dc.PublishedGlobal Biogeochemical Cycles 2015, 29(5):567-582eng
dc.description.abstractSoil N availability is constrained by the breakdown of N-containing polymers such as proteins to oligopeptides and amino acids that can be taken up by plants and microorganisms. Excess N is released from microbial cells as ammonium (N mineralization), which in turn can serve as substrate for nitrification. According to stoichiometric theory, N mineralization and nitrification are expected to increase in relation to protein depolymerization with decreasing N limitation, and thus from higher to lower latitudes and from topsoils to subsoils. To test these hypotheses, we compared gross rates of protein depolymerization, N mineralization and nitrification (determined using 15N pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67°N) to steppe (54°N). The investigated ecosystems differed strongly in N transformation rates, with highest protein depolymerization and N mineralization rates in middle and southern taiga. All N transformation rates decreased with soil depth following the decrease in organic matter content. Related to protein depolymerization, N mineralization and nitrification were significantly higher in mineral than in organic horizons, supporting a decrease in microbial N limitation with depth. In contrast, we did not find indications for a decrease in microbial N limitation from arctic to temperate ecosystems along the transect. Our findings thus challenge the perception of ubiquitous N limitation at high latitudes, but suggest a transition from N to C limitation of microorganisms with soil depth, even in high-latitude systems such as tundra and boreal forest.en_US
dc.publisherThe American Chemical Society (ACS) Publicationsen_US
dc.rightsAttribution CC BY 4.0eng
dc.subjectboreal foresteng
dc.subjectprotein depolymerizationeng
dc.titleMicrobial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberiaen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2015 The Authorsen_US
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Basic biosciences: 470::General microbiology: 472
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400en_US

Tilhørende fil(er)


Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel

Attribution CC BY 4.0
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution CC BY 4.0