Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil
International audience Abstract. Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the climate system remains highly uncertain, especially in subsoils (Ilyina and Friedlingstein, 2016; Shi et al., 2018). Using natural geothermal soil warming grad...
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Online Access: | https://hal.archives-ouvertes.fr/hal-03796685 https://doi.org/10.5194/bg-19-3381-2022 |
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ftunivnantes:oai:HAL:hal-03796685v1 2023-05-15T18:28:14+02:00 Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil Li, Chao Xiao, Chunwang Guenet, Bertrand Li, Mingxu Xu, Li He, Nianpeng Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2022 https://hal.archives-ouvertes.fr/hal-03796685 https://doi.org/10.5194/bg-19-3381-2022 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-19-3381-2022 hal-03796685 https://hal.archives-ouvertes.fr/hal-03796685 doi:10.5194/bg-19-3381-2022 ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-03796685 Biogeosciences, European Geosciences Union, 2022, 19 (14), pp.3381-3393. ⟨10.5194/bg-19-3381-2022⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2022 ftunivnantes https://doi.org/10.5194/bg-19-3381-2022 2022-10-04T23:05:25Z International audience Abstract. Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the climate system remains highly uncertain, especially in subsoils (Ilyina and Friedlingstein, 2016; Shi et al., 2018). Using natural geothermal soil warming gradients of up to +6.4 ∘C in subarctic grasslands (Sigurdsson et al., 2016), we show that soil organic carbon (SOC) stocks decline strongly and linearly with warming (−2.8 t ha−1 ∘C−1). Comparison of SOC stock changes following medium-term (5 and 10 years) and long-term (>50 years) warming revealed that all SOC stock reduction occurred within the first 5 years of warming, after which continued warming no longer reduced SOC stocks. This rapid equilibration of SOC observed in Andosol suggests a critical role for ecosystem adaptations to warming and could imply short-lived soil carbon–climate feedbacks. Our data further revealed that the soil C loss occurred in all aggregate size fractions and that SOC stock reduction was only visible in topsoil (0–10 cm). SOC stocks in subsoil (10–30 cm), where plant roots were absent, showed apparent conservation after >50 years of warming. The observed depth-dependent warming responses indicate that explicit vertical resolution is a prerequisite for global models to accurately project future SOC stocks for this soil type and should be investigated for soils with other mineralogies. Article in Journal/Newspaper Subarctic Université de Nantes: HAL-UNIV-NANTES Biogeosciences 19 14 3381 3393 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Li, Chao Xiao, Chunwang Guenet, Bertrand Li, Mingxu Xu, Li He, Nianpeng Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract. Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the climate system remains highly uncertain, especially in subsoils (Ilyina and Friedlingstein, 2016; Shi et al., 2018). Using natural geothermal soil warming gradients of up to +6.4 ∘C in subarctic grasslands (Sigurdsson et al., 2016), we show that soil organic carbon (SOC) stocks decline strongly and linearly with warming (−2.8 t ha−1 ∘C−1). Comparison of SOC stock changes following medium-term (5 and 10 years) and long-term (>50 years) warming revealed that all SOC stock reduction occurred within the first 5 years of warming, after which continued warming no longer reduced SOC stocks. This rapid equilibration of SOC observed in Andosol suggests a critical role for ecosystem adaptations to warming and could imply short-lived soil carbon–climate feedbacks. Our data further revealed that the soil C loss occurred in all aggregate size fractions and that SOC stock reduction was only visible in topsoil (0–10 cm). SOC stocks in subsoil (10–30 cm), where plant roots were absent, showed apparent conservation after >50 years of warming. The observed depth-dependent warming responses indicate that explicit vertical resolution is a prerequisite for global models to accurately project future SOC stocks for this soil type and should be investigated for soils with other mineralogies. |
author2 |
Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Li, Chao Xiao, Chunwang Guenet, Bertrand Li, Mingxu Xu, Li He, Nianpeng |
author_facet |
Li, Chao Xiao, Chunwang Guenet, Bertrand Li, Mingxu Xu, Li He, Nianpeng |
author_sort |
Li, Chao |
title |
Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
title_short |
Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
title_full |
Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
title_fullStr |
Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
title_full_unstemmed |
Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
title_sort |
soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.archives-ouvertes.fr/hal-03796685 https://doi.org/10.5194/bg-19-3381-2022 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-03796685 Biogeosciences, European Geosciences Union, 2022, 19 (14), pp.3381-3393. ⟨10.5194/bg-19-3381-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-19-3381-2022 hal-03796685 https://hal.archives-ouvertes.fr/hal-03796685 doi:10.5194/bg-19-3381-2022 |
op_doi |
https://doi.org/10.5194/bg-19-3381-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
14 |
container_start_page |
3381 |
op_container_end_page |
3393 |
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1766210621201711104 |