Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter
International audience Permafrost degradation may lead to mobilization of carbon and nutrients and enhance microbial processing rates of previously frozen organic matter. Although the pool size and chemical composition of dissolved organic matter (DOM) are fundamental determinants of the carbon cycl...
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ftsupagro:oai:HAL:hal-02944592v1 2024-01-14T10:04:02+01:00 Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter Fouché, Julien Christiansen, C., T Lafrenière, M., J Grogan, P. Lamoureux, S., F Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH) Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) Queen's University Kingston, Canada Center for Permafrost (CENPERM) Department of Geosciences and Natural Resource Management Copenhagen (IGN) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) This research was funded by the Natural Sciences and Engineering Research Council (NSERC) Discovery Frontiers ADAPT program, the ArcticNet Network of Centres of Excellence, and NSERC Discovery grants to 2020-12 https://hal.inrae.fr/hal-02944592 https://hal.inrae.fr/hal-02944592/document https://hal.inrae.fr/hal-02944592/file/2020_nature_fouche.pdf https://doi.org/10.1038/s41467-020-18331-w en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41467-020-18331-w info:eu-repo/semantics/altIdentifier/pmid/32908152 hal-02944592 https://hal.inrae.fr/hal-02944592 https://hal.inrae.fr/hal-02944592/document https://hal.inrae.fr/hal-02944592/file/2020_nature_fouche.pdf doi:10.1038/s41467-020-18331-w PUBMED: 32908152 WOS: 000600547200001 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 2041-1723 EISSN: 2041-1723 Nature Communications https://hal.inrae.fr/hal-02944592 Nature Communications, 2020, 11 (1), ⟨10.1038/s41467-020-18331-w⟩ ammonium chemical composition dissolved organic carbon dissolved organic matter permafrost watershed [SDV]Life Sciences [q-bio] [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study info:eu-repo/semantics/article Journal articles 2020 ftsupagro https://doi.org/10.1038/s41467-020-18331-w 2023-12-16T22:32:26Z International audience Permafrost degradation may lead to mobilization of carbon and nutrients and enhance microbial processing rates of previously frozen organic matter. Although the pool size and chemical composition of dissolved organic matter (DOM) are fundamental determinants of the carbon cycle in Arctic watersheds, its source within the seasonally thawing active layer and the underlying permafrost remains largely uncharacterized. Here, we used 25 soil cores that extended down into the permafrost from nine sites across Arctic Canada to quantify dissolved organic carbon (DOC) and nitrogen stocks, and to characterize DOM optical properties. Organic permafrost stores 5–7 times more DOC and ammonium than the active layer and mineral permafrost. Furthermore, the permafrost layers contain substantial low molecular weight DOM with low aromaticity suggesting high biodegradability. We conclude that soil organic matter stoichiometry and cryogenic processes determine permafrost DOM chemistry, and that thawing will mobilize large amounts of labile DOC and ammonium into Arctic watersheds. Article in Journal/Newspaper Arctic permafrost Portail HAL Institut Agro Montpellier Arctic Canada Nature Communications 11 1 |
institution |
Open Polar |
collection |
Portail HAL Institut Agro Montpellier |
op_collection_id |
ftsupagro |
language |
English |
topic |
ammonium chemical composition dissolved organic carbon dissolved organic matter permafrost watershed [SDV]Life Sciences [q-bio] [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study |
spellingShingle |
ammonium chemical composition dissolved organic carbon dissolved organic matter permafrost watershed [SDV]Life Sciences [q-bio] [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study Fouché, Julien Christiansen, C., T Lafrenière, M., J Grogan, P. Lamoureux, S., F Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
topic_facet |
ammonium chemical composition dissolved organic carbon dissolved organic matter permafrost watershed [SDV]Life Sciences [q-bio] [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study |
description |
International audience Permafrost degradation may lead to mobilization of carbon and nutrients and enhance microbial processing rates of previously frozen organic matter. Although the pool size and chemical composition of dissolved organic matter (DOM) are fundamental determinants of the carbon cycle in Arctic watersheds, its source within the seasonally thawing active layer and the underlying permafrost remains largely uncharacterized. Here, we used 25 soil cores that extended down into the permafrost from nine sites across Arctic Canada to quantify dissolved organic carbon (DOC) and nitrogen stocks, and to characterize DOM optical properties. Organic permafrost stores 5–7 times more DOC and ammonium than the active layer and mineral permafrost. Furthermore, the permafrost layers contain substantial low molecular weight DOM with low aromaticity suggesting high biodegradability. We conclude that soil organic matter stoichiometry and cryogenic processes determine permafrost DOM chemistry, and that thawing will mobilize large amounts of labile DOC and ammonium into Arctic watersheds. |
author2 |
Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH) Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) Queen's University Kingston, Canada Center for Permafrost (CENPERM) Department of Geosciences and Natural Resource Management Copenhagen (IGN) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) This research was funded by the Natural Sciences and Engineering Research Council (NSERC) Discovery Frontiers ADAPT program, the ArcticNet Network of Centres of Excellence, and NSERC Discovery grants to |
format |
Article in Journal/Newspaper |
author |
Fouché, Julien Christiansen, C., T Lafrenière, M., J Grogan, P. Lamoureux, S., F |
author_facet |
Fouché, Julien Christiansen, C., T Lafrenière, M., J Grogan, P. Lamoureux, S., F |
author_sort |
Fouché, Julien |
title |
Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
title_short |
Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
title_full |
Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
title_fullStr |
Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
title_full_unstemmed |
Canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
title_sort |
canadian permafrost stores large pools of ammonium and optically distinct dissolved organic matter |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.inrae.fr/hal-02944592 https://hal.inrae.fr/hal-02944592/document https://hal.inrae.fr/hal-02944592/file/2020_nature_fouche.pdf https://doi.org/10.1038/s41467-020-18331-w |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_source |
ISSN: 2041-1723 EISSN: 2041-1723 Nature Communications https://hal.inrae.fr/hal-02944592 Nature Communications, 2020, 11 (1), ⟨10.1038/s41467-020-18331-w⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41467-020-18331-w info:eu-repo/semantics/altIdentifier/pmid/32908152 hal-02944592 https://hal.inrae.fr/hal-02944592 https://hal.inrae.fr/hal-02944592/document https://hal.inrae.fr/hal-02944592/file/2020_nature_fouche.pdf doi:10.1038/s41467-020-18331-w PUBMED: 32908152 WOS: 000600547200001 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41467-020-18331-w |
container_title |
Nature Communications |
container_volume |
11 |
container_issue |
1 |
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1788058658639183872 |