Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil
Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the cli- mate 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 subar...
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ftcopernicus:oai:publications.copernicus.org:bgd100118 2023-05-15T18:28:14+02:00 Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil Verbrigghe, Niel Leblans, Niki I. W. Sigurdsson, Bjarni D. Vicca, Sara Fang, Chao Fuchslueger, Lucia Soong, Jennifer L. Weedon, James T. Poeplau, Christopher Ariza-Carricondo, Cristina Bahn, Michael Guenet, Bertrand Gundersen, Per Gunnarsdóttir, Gunnhildur E. G. Kätterer, Thomas Liu, Zhanfeng Maljanen, Marja Marañón-Jiménez, Sara Meeran, Kathiravan Oddsdóttir, Edda S. Ostonen, Ivika Peñuelas, Josep Richter, Andreas Sardans, Jordi Sigurðsson, Páll Torn, Margaret S. Bodegom, Peter M. Verbruggen, Erik Walker, Tom W. N. Wallander, Håkan Janssens, Ivan A. 2022-01-05 application/pdf https://doi.org/10.5194/bg-2021-338 https://bg.copernicus.org/preprints/bg-2021-338/ eng eng doi:10.5194/bg-2021-338 https://bg.copernicus.org/preprints/bg-2021-338/ eISSN: 1726-4189 Text 2022 ftcopernicus https://doi.org/10.5194/bg-2021-338 2022-01-10T17:22:17Z Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the cli- mate 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 ton 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 loss occurred within the first five 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 losses only occurred in topsoil (0–10 cm). SOC stocks in subsoil (10–30 cm), where plant roots were absent, remained unaltered, even 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. Text Subarctic Copernicus Publications: E-Journals |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Global warming may lead to carbon transfers from soils to the atmosphere, yet this positive feedback to the cli- mate 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 ton 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 loss occurred within the first five 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 losses only occurred in topsoil (0–10 cm). SOC stocks in subsoil (10–30 cm), where plant roots were absent, remained unaltered, even 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. |
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Text |
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Verbrigghe, Niel Leblans, Niki I. W. Sigurdsson, Bjarni D. Vicca, Sara Fang, Chao Fuchslueger, Lucia Soong, Jennifer L. Weedon, James T. Poeplau, Christopher Ariza-Carricondo, Cristina Bahn, Michael Guenet, Bertrand Gundersen, Per Gunnarsdóttir, Gunnhildur E. G. Kätterer, Thomas Liu, Zhanfeng Maljanen, Marja Marañón-Jiménez, Sara Meeran, Kathiravan Oddsdóttir, Edda S. Ostonen, Ivika Peñuelas, Josep Richter, Andreas Sardans, Jordi Sigurðsson, Páll Torn, Margaret S. Bodegom, Peter M. Verbruggen, Erik Walker, Tom W. N. Wallander, Håkan Janssens, Ivan A. |
spellingShingle |
Verbrigghe, Niel Leblans, Niki I. W. Sigurdsson, Bjarni D. Vicca, Sara Fang, Chao Fuchslueger, Lucia Soong, Jennifer L. Weedon, James T. Poeplau, Christopher Ariza-Carricondo, Cristina Bahn, Michael Guenet, Bertrand Gundersen, Per Gunnarsdóttir, Gunnhildur E. G. Kätterer, Thomas Liu, Zhanfeng Maljanen, Marja Marañón-Jiménez, Sara Meeran, Kathiravan Oddsdóttir, Edda S. Ostonen, Ivika Peñuelas, Josep Richter, Andreas Sardans, Jordi Sigurðsson, Páll Torn, Margaret S. Bodegom, Peter M. Verbruggen, Erik Walker, Tom W. N. Wallander, Håkan Janssens, Ivan A. Soil carbon loss in warmed subarctic grasslands is rapid and restricted to topsoil |
author_facet |
Verbrigghe, Niel Leblans, Niki I. W. Sigurdsson, Bjarni D. Vicca, Sara Fang, Chao Fuchslueger, Lucia Soong, Jennifer L. Weedon, James T. Poeplau, Christopher Ariza-Carricondo, Cristina Bahn, Michael Guenet, Bertrand Gundersen, Per Gunnarsdóttir, Gunnhildur E. G. Kätterer, Thomas Liu, Zhanfeng Maljanen, Marja Marañón-Jiménez, Sara Meeran, Kathiravan Oddsdóttir, Edda S. Ostonen, Ivika Peñuelas, Josep Richter, Andreas Sardans, Jordi Sigurðsson, Páll Torn, Margaret S. Bodegom, Peter M. Verbruggen, Erik Walker, Tom W. N. Wallander, Håkan Janssens, Ivan A. |
author_sort |
Verbrigghe, Niel |
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 |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-2021-338 https://bg.copernicus.org/preprints/bg-2021-338/ |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2021-338 https://bg.copernicus.org/preprints/bg-2021-338/ |
op_doi |
https://doi.org/10.5194/bg-2021-338 |
_version_ |
1766210626084929536 |