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Microbial mineralization of cellulose in frozen soils
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2017 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 8, no 1, article id 1154Article in journal (Refereed) Published
Abstract [en]

High-latitude soils store ~40% of the global soil carbon and experience winters of up to 6 months or more. The winter soil CO2 efflux importantly contributes to the annual CO2 budget. Microorganisms can metabolize short chain carbon compounds in frozen soils. However, soil organic matter (SOM) is dominated by biopolymers, requiring exoenzymatic hydrolysis prior to mineralization. For winter SOM decomposition to have a substantial influence on soil carbon balances it is crucial whether or not biopolymers can be metabolized in frozen soils. We added 13C-labeled cellulose to frozen (−4 °C) mesocosms of boreal forest soil and followed its decomposition. Here we show that cellulose biopolymers are hydrolyzed under frozen conditions sustaining both CO2 production and microbial growth contributing to slow, but persistent, SOM mineralization. Given the long periods with frozen soils at high latitudes these findings are essential for understanding the contribution from winter to the global carbon balance.

Place, publisher, year, edition, pages
London: Nature Publishing Group, 2017. Vol. 8, no 1, article id 1154
Keywords [en]
organic matter decomposition, unfrozen water content, freeze thaw cycles, forest soil, extracellular enzymes, exoenzyme activity, CO2 production, temperature, carbon, respiration
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-141321DOI: 10.1038/s41467-017-01230-yISI: 000413832800009OAI: oai:DiVA.org:umu-141321DiVA, id: diva2:1153303
Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2018-06-09Bibliographically approved

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Sparrman, TobiasMikkola, Jyri-PekkaSchleucher, Jürgen

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Sparrman, TobiasMikkola, Jyri-PekkaSchleucher, Jürgen
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Department of ChemistryDepartment of Medical Biochemistry and Biophysics
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CiteExportLink to record
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