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Soil organic carbon...
Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard
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- Semenchuk, Philipp R. (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Climate Impacts Research Centre, Umeå University, Abisko, Sweden; Department of Arctic and Marine Biology, Faculty of Biosciences Fisheries and Economics, UiT-The Arctic University of Norway, Tromsø, Norway; Division of Conservation Biology, Vegetation Ecology and Landscape Ecology, Department of Botany and Biodiversity Research, Vienna University, Vienna, Austria
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- Krab, Eveline J (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Climate Impacts Research Centre, Umeå University, Abisko, Sweden; Swedish University of Agricultural Sciences, Department of Soil and Environment, Uppsala, Sweden,Arcum,Institutionen för mark och miljö,Department of Soil and Environment,Umeå University
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- Hedenström, Mattias, 1976- (författare)
- Umeå universitet,Kemiska institutionen
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Phillips, Carly A. (författare)
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Ancin-Murguzur, Francisco J. (författare)
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Cooper, Elisabeth J. (författare)
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(creator_code:org_t)
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- Elsevier, 2019
- 2019
- Engelska.
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Ingår i: Science of the Total Environment. - : Elsevier. - 0048-9697 .- 1879-1026. ; 646, s. 158-167
- Relaterad länk:
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https://munin.uit.no...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- Arctic tundra active-layer soils are at risk of soil organic carbon (SOC) depletion and degradation upon global climate warming because they are in a stage of relatively early decomposition. Non-growing season (NGS) warming is particularly pronounced, and observed increases of CO2 emissions during experimentally warmed NGSs give concern for great SOC losses to the atmosphere. Here, we used snow fences in Arctic Spitsbergen dwarf shrub tundra to simulate 1.86 degrees C NGS warming for 9 consecutive years, while growing season temperatures remained unchanged. In the snow fence treatment, the 4-11 cm thick A-horizon had a 2% lower SOC concentration and a 0.48 kg Cm-2 smaller pool size than the controls, indicating SOC pool depletion. The snow fence treatment's A-horizon's alkyl/O-alkyl ratio was also significantly increased, indicating an advance of SOC degradation. The underlying 5 cm of B/C-horizon did not show these effects. Our results support the hypothesis that SOC depletion and degradation are connected to the long-term transience of observed ecosystem respiration (ER) increases upon soil warming. We suggest that the bulk of warming induced ER increases may originate from surface and not deep active layer or permafrost horizons. The observed losses of SOC might be significant for the ecosystem in question, but are in magnitude comparatively small relative to anthropogenic greenhouse gas enrichment of the atmosphere. We conclude that a positive feedback of carbon losses from surface soils of Arctic dwarf shrub tundra to anthropogenic forcing will be minor, but not negligible.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Nyckelord
- Snow fence
- NMR
- Carbon loss
- Decomposition
- Anthropogenic C emission feedback
- Tundra
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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