Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard
Accepted manuscript version, licensed CC BY-NC-ND 4.0. 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 prono...
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Online Access: | https://hdl.handle.net/10037/17212 https://doi.org/10.1016/j.scitotenv.2018.07.150 |
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ftunivtroemsoe:oai:munin.uit.no:10037/17212 2023-05-15T14:22:28+02:00 Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard Semenchuk, Philipp Krab, Eveline J Hedenström, Mattias Phillips, Carly A Murguzur, Francisco Javier Ancin Cooper, Elisabeth J. 2018-07-26 https://hdl.handle.net/10037/17212 https://doi.org/10.1016/j.scitotenv.2018.07.150 eng eng Elsevier Science of the Total Environment Framsenteret: Arctic GSL Norges forskningsråd: 230970 info:eu-repo/grantAgreement/RCN/FRIMEDBIO/230970/Norway/The effect of snow depth and snow melt timing on arctic terrestrial ecosystems// Semenchuk P, Krab, Hedenström M, Phillips, Murguzur F, Cooper E.J. Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard. . Science of the Total Environment. 2019;646:158-167 FRIDAID 1663901 doi:10.1016/j.scitotenv.2018.07.150 0048-9697 1879-1026 https://hdl.handle.net/10037/17212 openAccess © 2018 Elsevier B.V. All rights reserved. VDP::Mathematics and natural science: 400 VDP::Matematikk og Naturvitenskap: 400 Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2018 ftunivtroemsoe https://doi.org/10.1016/j.scitotenv.2018.07.150 2021-06-25T17:56:59Z Accepted manuscript version, licensed CC BY-NC-ND 4.0. 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 CO 2 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 °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 C m −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. Article in Journal/Newspaper Arctic Arctic permafrost Svalbard Tundra Spitsbergen University of Tromsø: Munin Open Research Archive Arctic Svalbard Science of The Total Environment 646 158 167 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400 VDP::Matematikk og Naturvitenskap: 400 |
spellingShingle |
VDP::Mathematics and natural science: 400 VDP::Matematikk og Naturvitenskap: 400 Semenchuk, Philipp Krab, Eveline J Hedenström, Mattias Phillips, Carly A Murguzur, Francisco Javier Ancin Cooper, Elisabeth J. Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard |
topic_facet |
VDP::Mathematics and natural science: 400 VDP::Matematikk og Naturvitenskap: 400 |
description |
Accepted manuscript version, licensed CC BY-NC-ND 4.0. 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 CO 2 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 °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 C m −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. |
format |
Article in Journal/Newspaper |
author |
Semenchuk, Philipp Krab, Eveline J Hedenström, Mattias Phillips, Carly A Murguzur, Francisco Javier Ancin Cooper, Elisabeth J. |
author_facet |
Semenchuk, Philipp Krab, Eveline J Hedenström, Mattias Phillips, Carly A Murguzur, Francisco Javier Ancin Cooper, Elisabeth J. |
author_sort |
Semenchuk, Philipp |
title |
Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard |
title_short |
Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard |
title_full |
Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard |
title_fullStr |
Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard |
title_full_unstemmed |
Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard |
title_sort |
soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in high arctic svalbard |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/17212 https://doi.org/10.1016/j.scitotenv.2018.07.150 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic permafrost Svalbard Tundra Spitsbergen |
genre_facet |
Arctic Arctic permafrost Svalbard Tundra Spitsbergen |
op_relation |
Science of the Total Environment Framsenteret: Arctic GSL Norges forskningsråd: 230970 info:eu-repo/grantAgreement/RCN/FRIMEDBIO/230970/Norway/The effect of snow depth and snow melt timing on arctic terrestrial ecosystems// Semenchuk P, Krab, Hedenström M, Phillips, Murguzur F, Cooper E.J. Soil organic carbon depletion and degradation in surface soil after long-term non-growing season warming in High Arctic Svalbard. . Science of the Total Environment. 2019;646:158-167 FRIDAID 1663901 doi:10.1016/j.scitotenv.2018.07.150 0048-9697 1879-1026 https://hdl.handle.net/10037/17212 |
op_rights |
openAccess © 2018 Elsevier B.V. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.scitotenv.2018.07.150 |
container_title |
Science of The Total Environment |
container_volume |
646 |
container_start_page |
158 |
op_container_end_page |
167 |
_version_ |
1766295051418206208 |