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Microbial utilization of simple carbon substrates in boreal peat soils at low temperatures
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Swedish Univ Agr Sci SLU, Dept Forest Ecol & Management, SE-90183 Umea, Sweden.
Swedish Univ Agr Sci SLU, Dept Forest Ecol & Management, SE-90183 Umea, Sweden.
Umea Univ, Dept Med Biochem & Biophys, SE-90187 Umea, Sweden.
Swedish Univ Agr Sci SLU, Dept Forest Ecol & Management, SE-90183 Umea, Sweden.
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2019 (English)In: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 135, p. 438-448Article in journal (Refereed) Published
Abstract [en]

Boreal peatlands are key high-latitude ecosystem types and act as a carbon (C) sink storing an estimated 25% of the world's soil C. These environments are currently seeing the most substantial changing climate, especially during the winter. CO2 emissions during the winter can correspond to 80% of the growing season's net CO2 assimilation. Yet, our conceptual understanding of the controls on microbial metabolic activity in peat soils at temperatures <= 0 degrees C is poor. We used stable isotope probing of peat samples and tracked the fate of C-13-glucose using C-13-NMR. We show that microorganisms in frozen boreal peat soils utilize monomeric C-substrates to sustain both catabolic and anabolic metabolism at temperatures down to -5 degrees C. The C-13-substrate was transformed into C-13-CO2, different metabolites, and incorporated into membrane phospholipid fatty acids. The 16S rRNA-based community analyses revealed the activity at -3 degrees C changes the composition of the bacterial cornmunity over relevant timescales. Below 0 degrees C, small temperature changes have strong effects on process rates and small differences in winter soil temperature may affect C dynamics of northern peatlands. Understanding biological processes at low and below zero temperatures are central for the overall functioning of these systems representing one of the world's major soil C pools.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 135, p. 438-448
Keywords [en]
Frozen peat soils, Microbial activity, Metabolism, C-13-NMR, DNA, Carbon cycling
National Category
Soil Science
Identifiers
URN: urn:nbn:se:uu:diva-392577DOI: 10.1016/j.soilbio.2019.06.006ISI: 000477689700051OAI: oai:DiVA.org:uu-392577DiVA, id: diva2:1349601
Funder
Swedish Research Council, 621-2011-4874Swedish Research Council Formas, 214-2013- 834Knut and Alice Wallenberg Foundation, 2011.0228The Kempe Foundations, JCK1107Carl Tryggers foundation , 13:536Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-09-09Bibliographically approved

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Segura, JavierSzekely, Anna J.Bertilsson, Stefan

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