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Degradation potentials of dissolved organic carbon (DOC) from thawed permafrost peat

Panneer Selvam, Balathandayuthabani LU ; Lapierre, Jean-François; Guillemette, Francois; Voigt, Carolina; Lamprecht, Richard E.; Biasi, Christina; Christensen, Torben LU ; Martikainen, Pertti J and Berggren, Martin LU (2017) In Scientific Reports 7.
Abstract
Global warming can substantially affect the export of dissolved organic carbon (DOC) from peat-permafrost to aquatic systems. The direct degradability of such peat-derived DOC, however, is poorly constrained because previous permafrost thaw studies have mainly addressed mineral soil catchments or DOC pools that have already been processed in surface waters. We incubated peat cores from a palsa mire to compare an active layer and an experimentally thawed permafrost layer with regard to DOC composition and degradation potentials of pore water DOC. Our results show that DOC from the thawed permafrost layer had high initial degradation potentials compared with DOC from the active layer. In fact, the DOC that showed the highest bio- and... (More)
Global warming can substantially affect the export of dissolved organic carbon (DOC) from peat-permafrost to aquatic systems. The direct degradability of such peat-derived DOC, however, is poorly constrained because previous permafrost thaw studies have mainly addressed mineral soil catchments or DOC pools that have already been processed in surface waters. We incubated peat cores from a palsa mire to compare an active layer and an experimentally thawed permafrost layer with regard to DOC composition and degradation potentials of pore water DOC. Our results show that DOC from the thawed permafrost layer had high initial degradation potentials compared with DOC from the active layer. In fact, the DOC that showed the highest bio- and photo-degradability, respectively, originated in the thawed permafrost layer. Our study sheds new light on the DOC composition of peat-permafrost directly upon thaw and suggests that past estimates of carbon-dioxide emissions from thawed peat permafrost may be biased as they have overlooked the initial mineralization potential of the exported DOC. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
7
publisher
Nature Publishing Group
external identifiers
  • scopus:85017121990
  • wos:000398337300003
ISSN
2045-2322
DOI
10.1038/srep45811
language
English
LU publication?
yes
id
db6dd6bb-0c67-450d-8705-43b774cf0c1a
date added to LUP
2017-04-06 17:10:37
date last changed
2018-05-27 04:41:10
@article{db6dd6bb-0c67-450d-8705-43b774cf0c1a,
  abstract     = {Global warming can substantially affect the export of dissolved organic carbon (DOC) from peat-permafrost to aquatic systems. The direct degradability of such peat-derived DOC, however, is poorly constrained because previous permafrost thaw studies have mainly addressed mineral soil catchments or DOC pools that have already been processed in surface waters. We incubated peat cores from a palsa mire to compare an active layer and an experimentally thawed permafrost layer with regard to DOC composition and degradation potentials of pore water DOC. Our results show that DOC from the thawed permafrost layer had high initial degradation potentials compared with DOC from the active layer. In fact, the DOC that showed the highest bio- and photo-degradability, respectively, originated in the thawed permafrost layer. Our study sheds new light on the DOC composition of peat-permafrost directly upon thaw and suggests that past estimates of carbon-dioxide emissions from thawed peat permafrost may be biased as they have overlooked the initial mineralization potential of the exported DOC.},
  articleno    = {45811},
  author       = {Panneer Selvam, Balathandayuthabani and Lapierre, Jean-François and Guillemette, Francois and Voigt, Carolina and Lamprecht,  Richard E. and Biasi,  Christina and Christensen, Torben and Martikainen, Pertti J and Berggren, Martin},
  issn         = {2045-2322},
  language     = {eng},
  month        = {04},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Degradation potentials of dissolved organic carbon (DOC) from thawed permafrost peat},
  url          = {http://dx.doi.org/10.1038/srep45811},
  volume       = {7},
  year         = {2017},
}