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Decade of experimen...
Decade of experimental permafrost thaw reduces turnover of young carbon and increases losses of old carbon, without affecting the net carbon balance
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- Olid, Carolina, 1981- (författare)
- Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Klaminder, Jonatan, 1976- (författare)
- Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum
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- Monteux, Sylvain (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden,Arcum,Institutionen för mark och miljö
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- Johansson, Margareta (författare)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science,Royal Swedish Academy of Science
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- Dorrepaal, Ellen (författare)
- Umeå University,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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(creator_code:org_t)
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- 2020-08-20
- 2020
- Engelska.
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Ingår i: Global Change Biology. - : John Wiley & Sons. - 1354-1013 .- 1365-2486. ; 26:10, s. 5886-5898
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Abstract
Ämnesord
Stäng
- Thicker snowpacks and their insulation effects cause winter-warming and invoke thaw of permafrost ecosystems. Temperature-dependent decomposition of previously frozen carbon (C) is currently considered one of the strongest feedbacks between the Arctic and the climate system, but the direction and magnitude of the net C balance remains uncertain. This is because winter effects are rarely integrated with C fluxes during the snow-free season and because predicting the net C balance from both surface processes and thawing deep layers remains challenging. In this study, we quantified changes in the long-term net C balance (net ecosystem production) in a subarctic peat plateau subjected to 10 years of experimental winter-warming. By combining(210)Pb and(14)Cdating of peat cores with peat growth models, we investigated thawing effects on year-round primary production and C losses through respiration and leaching from both shallow and deep peat layers. Winter-warming and permafrost thaw had no effect on the net C balance, but strongly affected gross C fluxes. Carbon losses through decomposition from the upper peat were reduced as thawing of permafrost induced surface subsidence and subsequent waterlogging. However, primary production was also reduced likely due to a strong decline in bryophytes cover while losses from the old C pool almost tripled, caused by the deepened active layer. Our findings highlight the need to estimate long-term responses of whole-year production and decomposition processes to thawing, both in shallow and deep soil layers, as they may contrast and lead to unexpected net effects on permafrost C storage.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- age-depth modelling
- carbon accumulation
- carbon cycle
- climate change
- decomposition
- peat dating
- permafrost thawing
- production
- snow addition
- winter-warming
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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