Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada
Recent climate warming is contributing to permafrost degradation and vegetation change; however, little is known about the legacy of Holocene landscape change on contemporary soil biogeochemical conditions. In permafrost soils of northwestern Canada, widespread permafrost degradation occurred during...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | https://pure.au.dk/portal/en/publications/c4a0e5d5-bff2-4196-8f0d-1ebdd06247c4 https://doi.org/10.1029/2018JG004916 http://www.scopus.com/inward/record.url?scp=85071738401&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/c4a0e5d5-bff2-4196-8f0d-1ebdd06247c4 2024-05-12T08:09:40+00:00 Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada Lacelle, Denis Fontaine, Marielle Pellerin, André Kokelj, Steve V. Clark, Ian D. 2019 https://pure.au.dk/portal/en/publications/c4a0e5d5-bff2-4196-8f0d-1ebdd06247c4 https://doi.org/10.1029/2018JG004916 http://www.scopus.com/inward/record.url?scp=85071738401&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/c4a0e5d5-bff2-4196-8f0d-1ebdd06247c4 info:eu-repo/semantics/restrictedAccess Lacelle , D , Fontaine , M , Pellerin , A , Kokelj , S V & Clark , I D 2019 , ' Legacy of Holocene Landscape Changes on Soil Biogeochemistry : A Perspective From Paleo-Active Layers in Northwestern Canada ' , Journal of Geophysical Research: Biogeosciences , vol. 124 , no. 9 , pp. 2662-2679 . https://doi.org/10.1029/2018JG004916 article 2019 ftuniaarhuspubl https://doi.org/10.1029/2018JG004916 2024-04-17T23:42:41Z Recent climate warming is contributing to permafrost degradation and vegetation change; however, little is known about the legacy of Holocene landscape change on contemporary soil biogeochemical conditions. In permafrost soils of northwestern Canada, widespread permafrost degradation occurred during the early Holocene warm interval and its impacts on soil biogeochemistry are archived in the paleo-active layer. Here we show contrasting profiles of soil soluble chemistry and organic carbon composition at sites affected by different types of permafrost degradation. At sites that experienced increased depth of thaw, the relict active layer contained a lower abundance of soluble ions than the underlying undisturbed permafrost; however, both the relict active layer and undisturbed permafrost contained mainly old recalcitrant organics suggesting that minor microbial degradation of organics had occurred. At sites that experienced past thaw slumping, the relict active layer had a higher solute content and contained both young-degradable and old-recalcitrant organics due to the integration of slumped surface organic mats into the colluvial soils or vegetation re-colonizing the surface of the former slump. Our results show that permafrost degradation that occurred during the early to mid-Holocene have preconditioned the biogeochemical conditions in near-surface permafrost soils such that significant local variability exist following past landscape changes. Thus, determining the state of soil soluble chemistry and SOC in permafrost should be done within a paleo-landscape change framework to better forecast CO 2 –CH 4 emissions and solutes release from thawing permafrost. Article in Journal/Newspaper permafrost Aarhus University: Research Canada Journal of Geophysical Research: Biogeosciences 124 9 2662 2679 |
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Open Polar |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
Recent climate warming is contributing to permafrost degradation and vegetation change; however, little is known about the legacy of Holocene landscape change on contemporary soil biogeochemical conditions. In permafrost soils of northwestern Canada, widespread permafrost degradation occurred during the early Holocene warm interval and its impacts on soil biogeochemistry are archived in the paleo-active layer. Here we show contrasting profiles of soil soluble chemistry and organic carbon composition at sites affected by different types of permafrost degradation. At sites that experienced increased depth of thaw, the relict active layer contained a lower abundance of soluble ions than the underlying undisturbed permafrost; however, both the relict active layer and undisturbed permafrost contained mainly old recalcitrant organics suggesting that minor microbial degradation of organics had occurred. At sites that experienced past thaw slumping, the relict active layer had a higher solute content and contained both young-degradable and old-recalcitrant organics due to the integration of slumped surface organic mats into the colluvial soils or vegetation re-colonizing the surface of the former slump. Our results show that permafrost degradation that occurred during the early to mid-Holocene have preconditioned the biogeochemical conditions in near-surface permafrost soils such that significant local variability exist following past landscape changes. Thus, determining the state of soil soluble chemistry and SOC in permafrost should be done within a paleo-landscape change framework to better forecast CO 2 –CH 4 emissions and solutes release from thawing permafrost. |
format |
Article in Journal/Newspaper |
author |
Lacelle, Denis Fontaine, Marielle Pellerin, André Kokelj, Steve V. Clark, Ian D. |
spellingShingle |
Lacelle, Denis Fontaine, Marielle Pellerin, André Kokelj, Steve V. Clark, Ian D. Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada |
author_facet |
Lacelle, Denis Fontaine, Marielle Pellerin, André Kokelj, Steve V. Clark, Ian D. |
author_sort |
Lacelle, Denis |
title |
Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada |
title_short |
Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada |
title_full |
Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada |
title_fullStr |
Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada |
title_full_unstemmed |
Legacy of Holocene Landscape Changes on Soil Biogeochemistry:A Perspective From Paleo-Active Layers in Northwestern Canada |
title_sort |
legacy of holocene landscape changes on soil biogeochemistry:a perspective from paleo-active layers in northwestern canada |
publishDate |
2019 |
url |
https://pure.au.dk/portal/en/publications/c4a0e5d5-bff2-4196-8f0d-1ebdd06247c4 https://doi.org/10.1029/2018JG004916 http://www.scopus.com/inward/record.url?scp=85071738401&partnerID=8YFLogxK |
geographic |
Canada |
geographic_facet |
Canada |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Lacelle , D , Fontaine , M , Pellerin , A , Kokelj , S V & Clark , I D 2019 , ' Legacy of Holocene Landscape Changes on Soil Biogeochemistry : A Perspective From Paleo-Active Layers in Northwestern Canada ' , Journal of Geophysical Research: Biogeosciences , vol. 124 , no. 9 , pp. 2662-2679 . https://doi.org/10.1029/2018JG004916 |
op_relation |
https://pure.au.dk/portal/en/publications/c4a0e5d5-bff2-4196-8f0d-1ebdd06247c4 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2018JG004916 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
124 |
container_issue |
9 |
container_start_page |
2662 |
op_container_end_page |
2679 |
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1798852971355701248 |