Input of easily available organic C and N stimulates microbial decomposition of soil organic matter in arctic permafrost soil

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dc.identifier.uri Wild, Birgit Schnecker, Jörg Alves, Ricardo J. Eloy Barsukov, Pavel Barta, Jiri Čapek, Petr Gentsch, Norman Gittel, Antje Guggenberger, Georg Lashchinskiy, Nikolay Mikutta, Robert Rusalimova, Olga Šantrůčková, Hana Shibistova, Olga Urich, Tim Watzka, Margarete Zrazhevskaya, Galina Richter, Andreas 2017-01-27T08:36:56Z 2017-01-27T08:36:56Z 2014
dc.identifier.citation Wild, B.; Schnecker, J.; Alves, R.J.E.; Barsukov, P.; Bárta, Jiri et al.: Input of easily available organic C and N stimulates microbial decomposition of soil organic matter in arctic permafrost soil. In: Soil Biology and Biochemistry 75 (2014), S. 143-151. DOI:
dc.description.abstract Rising temperatures in the Arctic can affect soil organic matter (SOM) decomposition directly and indirectly, by increasing plant primary production and thus the allocation of plant-derived organic compounds into the soil. Such compounds, for example root exudates or decaying fine roots, are easily available for microorganisms, and can alter the decomposition of older SOM ("priming effect"). We here report on a SOM priming experiment in the active layer of a permafrost soil from the central Siberian Arctic, comparing responses of organic topsoil, mineral subsoil, and cryoturbated subsoil material (i.e., poorly decomposed topsoil material subducted into the subsoil by freeze-thaw processes) to additions of 13C-labeled glucose, cellulose, a mixture of amino acids, and protein (added at levels corresponding to approximately 1% of soil organic carbon). SOM decomposition in the topsoil was barely affected by higher availability of organic compounds, whereas SOM decomposition in both subsoil horizons responded strongly. In the mineral subsoil, SOM decomposition increased by a factor of two to three after any substrate addition (glucose, cellulose, amino acids, protein), suggesting that the microbial decomposer community was limited in energy to break down more complex components of SOM. In the cryoturbated horizon, SOM decomposition increased by a factor of two after addition of amino acids or protein, but was not significantly affected by glucose or cellulose, indicating nitrogen rather than energy limitation. Since the stimulation of SOM decomposition in cryoturbated material was not connected to microbial growth or to a change in microbial community composition, the additional nitrogen was likely invested in the production of extracellular enzymes required for SOM decomposition. Our findings provide a first mechanistic understanding of priming in permafrost soils and suggest that an increase in the availability of organic carbon or nitrogen, e.g., by increased plant productivity, can change the decomposition of SOM stored in deeper layers of permafrost soils, with possible repercussions on the global climate. eng
dc.description.sponsorship Austrian Science Fund (FWF)/CryoCARB
dc.language.iso eng
dc.publisher London : Elsevier Ltd.
dc.relation.ispartofseries Soil Biology and Biochemistry 75 (2014)
dc.rights CC BY 3.0
dc.subject Organic matter decomposition eng
dc.subject Permafrost eng
dc.subject Phospholipid fatty acid (PLFA) eng
dc.subject Priming eng
dc.subject Tundra eng
dc.subject Amino acids eng
dc.subject Biogeochemistry eng
dc.subject Cellulose eng
dc.subject Climate change eng
dc.subject Glucose eng
dc.subject Microorganisms eng
dc.subject Nitrogen eng
dc.subject Organic compounds eng
dc.subject Permafrost eng
dc.subject Phospholipids eng
dc.subject Proteins eng
dc.subject Decomposer communities eng
dc.subject Extracellular enzymes eng
dc.subject Microbial community composition eng
dc.subject Microbial decomposition eng
dc.subject.ddc 570 | Biowissenschaften, Biologie ger
dc.title Input of easily available organic C and N stimulates microbial decomposition of soil organic matter in arctic permafrost soil
dc.type article
dc.type Text
dc.relation.issn 0038-0717
dc.bibliographicCitation.volume 75
dc.bibliographicCitation.firstPage 143
dc.bibliographicCitation.lastPage 151
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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