Long-term in situ permafrost thaw effects on bacterial communities and potential aerobic respiration

Monteux, SylvainUmeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Climate Impacts Research Centre (CIRC) ; Arcum (author)

A correction to this article has been published. DOI: 10.1038/s41396-019-0384-1
The decomposition of large stocks of soil organic carbon in thawing permafrost might depend on more than climate change-induced temperature increases: indirect effects of thawing via altered bacterial community structure (BCS) or rooting patterns are largely unexplored. We used a 10-year in situ permafrost thaw experiment and aerobic incubations to investigate alterations in BCS and potential respiration at different depths, and the extent to which they are related with each other and with root density. Active layer and permafrost BCS strongly differed, and the BCS in formerly frozen soils (below the natural thawfront) converged under induced deep thaw to strongly resemble the active layer BCS, possibly as a result of colonization by overlying microorganisms. Overall, respiration rates decreased with depth and soils showed lower potential respiration when subjected to deeper thaw, which we attributed to gradual labile carbon pool depletion. Despite deeper rooting under induced deep thaw, root density measurements did not improve soil chemistry-based models of potential respiration. However, BCS explained an additional unique portion of variation in respiration, particularly when accounting for differences in organic matter content. Our results suggest that by measuring bacterial community composition, we can improve both our understanding and the modeling of the permafrost carbon feedback.

Weedon, James T.University of Antwerp,Vrije Universiteit Amsterdam (author)
Blume-Werry, Gesche,1985-Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Climate Impacts Research Centre (CIRC) ; Arcum(Swepub:umu)gebl0003 (author)
Gavazov, Konstantin,1983-Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Federal Institute for Forest, Snow and Landscape Research WSL, Lausanne, Switzerland,Climate Impacts Research Centre (CIRC) ; Arcum,Swiss Federal Institute for Forest, Snow and Landscape Research(Swepub:umu)koga0004 (author)
Jassey, Vincent E. J.University of Toulouse (author)
Johansson, MargaretaLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)nate-mjo (author)
Keuper, FridaINRA National Institute of Agricultural Research (author)
Olid, Carolina,1981-Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Climate Impacts Research Centre (CIRC) ; Arcum(Swepub:umu)caol0050 (author)
Dorrepaal, EllenUmeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Climate Impacts Research Centre (CIRC) ; Arcum(Swepub:umu)eldo0004 (author)
Umeå universitetInstitutionen för ekologi, miljö och geovetenskap (creator_code:org_t)

By the author/editor: Monteux, Sylvain; Weedon, James T.; Blume-Werry, Ges ...; Gavazov, Konstan ...; Jassey, Vincent ...; Johansson, Marga ...; show more...; Keuper, Frida; Olid, Carolina, ...; Dorrepaal, Ellen; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

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