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dc.contributor.authorVoigt, Carolina
dc.contributor.authorMarushchak, Maija
dc.contributor.authorMastepanov, Mikhail
dc.contributor.authorLamprecht, Richard E.
dc.contributor.authorChristensen, Torben R.
dc.contributor.authorDorodnikov, Maxim
dc.contributor.authorJackowicz‐Korczyński, Marcin
dc.contributor.authorLindgren, Amelie
dc.contributor.authorLohila, Annalea
dc.contributor.authorNykänen, Hannu
dc.contributor.authorOinonen, Markku
dc.contributor.authorOksanen, Timo
dc.contributor.authorPalonen, Vesa
dc.contributor.authorTreat, Claire C.
dc.contributor.authorMartikainen, Pertti J.
dc.contributor.authorBiasi, Christina
dc.date.accessioned2019-04-24T05:37:34Z
dc.date.available2020-01-26T22:35:38Z
dc.date.issued2019
dc.identifier.citationVoigt, C., Marushchak, M., Mastepanov, M., Lamprecht, R. E., Christensen, T. R., Dorodnikov, M., Jackowicz‐Korczyński, M., Lindgren, A., Lohila, A., Nykänen, H., Oinonen, M., Oksanen, T., Palonen, V., Treat, C. C., Martikainen, P. J., & Biasi, C. (2019). Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw. <i>Global Change Biology</i>, <i>25</i>(5), 1746-1764. <a href="https://doi.org/10.1111/gcb.14574" target="_blank">https://doi.org/10.1111/gcb.14574</a>
dc.identifier.otherCONVID_28890098
dc.identifier.otherTUTKAID_80477
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/63578
dc.description.abstractPermafrost peatlands are biogeochemical hot spots in the Arctic as they store vast amounts of carbon. Permafrost thaw could release part of these long‐term immobile carbon stocks as the greenhouse gases (GHGs) carbon dioxide (CO2) and methane (CH4) to the atmosphere, but how much, at which time‐span and as which gaseous carbon species is still highly uncertain. Here we assess the effect of permafrost thaw on GHG dynamics under different moisture and vegetation scenarios in a permafrost peatland. A novel experimental approach using intact plant–soil systems (mesocosms) allowed us to simulate permafrost thaw under near‐natural conditions. We monitored GHG flux dynamics via high‐resolution flow‐through gas measurements, combined with detailed monitoring of soil GHG concentration dynamics, yielding insights into GHG production and consumption potential of individual soil layers. Thawing the upper 10–15 cm of permafrost under dry conditions increased CO2 emissions to the atmosphere (without vegetation: 0.74 ± 0.49 vs. 0.84 ± 0.60 g CO2–C m−2 day−1; with vegetation: 1.20 ± 0.50 vs. 1.32 ± 0.60 g CO2–C m−2 day−1, mean ± SD, pre‐ and post‐thaw, respectively). Radiocarbon dating (14C) of respired CO2, supported by an independent curve‐fitting approach, showed a clear contribution (9%–27%) of old carbon to this enhanced post‐thaw CO2 flux. Elevated concentrations of CO2, CH4, and dissolved organic carbon at depth indicated not just pulse emissions during the thawing process, but sustained decomposition and GHG production from thawed permafrost. Oxidation of CH4 in the peat column, however, prevented CH4 release to the atmosphere. Importantly, we show here that, under dry conditions, peatlands strengthen the permafrost–carbon feedback by adding to the atmospheric CO2 burden post‐thaw. However, as long as the water table remains low, our results reveal a strong CH4 sink capacity in these types of Arctic ecosystems pre‐ and post‐thaw, with the potential to compensate part of the permafrost CO2 losses over longer timescales.fi
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherWiley-Blackwell Publishing Ltd.
dc.relation.ispartofseriesGlobal Change Biology
dc.rightsIn Copyright
dc.subject.othergreenhouse gas
dc.subject.otherclimate warming
dc.subject.otherpermafrost-carbon-feedback
dc.subject.otherCO2
dc.subject.othermethane oxidation
dc.subject.othermesocosm
dc.titleEcosystem carbon response of an Arctic peatland to simulated permafrost thaw
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201904162198
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2019-04-16T15:15:08Z
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.format.pagerange1746-1764
dc.relation.issn1354-1013
dc.relation.numberinseries5
dc.relation.volume25
dc.type.versionacceptedVersion
dc.rights.copyright© 2019 John Wiley & Sons Ltd.
dc.rights.accesslevelopenAccessfi
dc.subject.ysokasvihuonekaasut
dc.subject.ysometaani
dc.subject.ysohiilidioksidi
dc.subject.ysokasvihuoneilmiö
dc.subject.ysohiilen kierto
dc.subject.ysoikirouta
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p4729
jyx.subject.urihttp://www.yso.fi/onto/yso/p13222
jyx.subject.urihttp://www.yso.fi/onto/yso/p4728
jyx.subject.urihttp://www.yso.fi/onto/yso/p5726
jyx.subject.urihttp://www.yso.fi/onto/yso/p28986
jyx.subject.urihttp://www.yso.fi/onto/yso/p20612
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.relation.doi10.1111/gcb.14574
dc.type.okmA1


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