Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils
Abstract: Increasing temperatures may alter the stoichiometric demands of soil microbes and impair their capacity to stabilize carbon (C) and retain nitrogen (N), with critical consequences for the soil C and N storage at high latitude soils. Geothermally active areas in Iceland provided wide, conti...
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Online Access: | https://hdl.handle.net/10067/1602310151162165141 https://repository.uantwerpen.be/docman/irua/19cd5a/160231_2020_01_01.pdf |
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ftunivantwerpen:c:irua:160231 2023-07-16T03:59:13+02:00 Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils Marañon Jiménez, Sara Penuelas, J. Richter, A. Sigurdsson, B. D. Fuchslueger, Lucia Leblans, Niki Janssens, Ivan 2019 pdf https://hdl.handle.net/10067/1602310151162165141 https://repository.uantwerpen.be/docman/irua/19cd5a/160231_2020_01_01.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/J.SOILBIO.2019.03.028 info:eu-repo/semantics/altIdentifier/isi/000467508000018 info:eu-repo/semantics/openAccess 0038-0717 Soil biology and biochemistry Biology info:eu-repo/semantics/acceptedVersion info:eu-repo/semantics/article 2019 ftunivantwerpen https://doi.org/10.1016/J.SOILBIO.2019.03.028 2023-06-26T22:28:40Z Abstract: Increasing temperatures may alter the stoichiometric demands of soil microbes and impair their capacity to stabilize carbon (C) and retain nitrogen (N), with critical consequences for the soil C and N storage at high latitude soils. Geothermally active areas in Iceland provided wide, continuous and stable gradients of soil temperatures to test this hypothesis. In order to characterize the stoichiometric demands of microbes from these subarctic soils, we incubated soils from ambient temperatures after the factorial addition of C, N and P substrates separately and in combination. In a second experiment, soils that had been exposed to different in situ warming intensities (+ 0, + 0.5, + 1.8, + 3.4, + 8.7, + 15.9 degrees C above ambient) for seven years were incubated after the combined addition of C, N and P to evaluate the capacity of soil microbes to store and immobilize C and N at the different warming scenarios. The seven years of chronic soil warming triggered large and proportional soil C and N losses (4.1 +/- 0.5% degrees C-1 of the stocks in unwarmed soils) from the upper 10 cm of soil, with a predominant depletion of the physically accessible organic substrates that were weakly sorbed in soil minerals up to 8.7 degrees C warming. Soil microbes met the increasing respiratory demands under conditions of low C accessibility at the expenses of a reduction of the standing biomass in warmer soils. This together with the strict microbial C:N stoichiometric demands also constrained their capacity of N retention, and increased the vulnerability of soil to N losses. Our findings suggest a strong control of microbial physiology and C:N stoichiometric needs on the retention of soil N and on the resilience of soil C stocks from high-latitudes to warming, particularly during periods of vegetation dormancy and low C inputs. Article in Journal/Newspaper Iceland Subarctic IRUA - Institutional Repository van de Universiteit Antwerpen Soil Biology and Biochemistry 134 152 161 |
institution |
Open Polar |
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IRUA - Institutional Repository van de Universiteit Antwerpen |
op_collection_id |
ftunivantwerpen |
language |
English |
topic |
Biology |
spellingShingle |
Biology Marañon Jiménez, Sara Penuelas, J. Richter, A. Sigurdsson, B. D. Fuchslueger, Lucia Leblans, Niki Janssens, Ivan Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
topic_facet |
Biology |
description |
Abstract: Increasing temperatures may alter the stoichiometric demands of soil microbes and impair their capacity to stabilize carbon (C) and retain nitrogen (N), with critical consequences for the soil C and N storage at high latitude soils. Geothermally active areas in Iceland provided wide, continuous and stable gradients of soil temperatures to test this hypothesis. In order to characterize the stoichiometric demands of microbes from these subarctic soils, we incubated soils from ambient temperatures after the factorial addition of C, N and P substrates separately and in combination. In a second experiment, soils that had been exposed to different in situ warming intensities (+ 0, + 0.5, + 1.8, + 3.4, + 8.7, + 15.9 degrees C above ambient) for seven years were incubated after the combined addition of C, N and P to evaluate the capacity of soil microbes to store and immobilize C and N at the different warming scenarios. The seven years of chronic soil warming triggered large and proportional soil C and N losses (4.1 +/- 0.5% degrees C-1 of the stocks in unwarmed soils) from the upper 10 cm of soil, with a predominant depletion of the physically accessible organic substrates that were weakly sorbed in soil minerals up to 8.7 degrees C warming. Soil microbes met the increasing respiratory demands under conditions of low C accessibility at the expenses of a reduction of the standing biomass in warmer soils. This together with the strict microbial C:N stoichiometric demands also constrained their capacity of N retention, and increased the vulnerability of soil to N losses. Our findings suggest a strong control of microbial physiology and C:N stoichiometric needs on the retention of soil N and on the resilience of soil C stocks from high-latitudes to warming, particularly during periods of vegetation dormancy and low C inputs. |
format |
Article in Journal/Newspaper |
author |
Marañon Jiménez, Sara Penuelas, J. Richter, A. Sigurdsson, B. D. Fuchslueger, Lucia Leblans, Niki Janssens, Ivan |
author_facet |
Marañon Jiménez, Sara Penuelas, J. Richter, A. Sigurdsson, B. D. Fuchslueger, Lucia Leblans, Niki Janssens, Ivan |
author_sort |
Marañon Jiménez, Sara |
title |
Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
title_short |
Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
title_full |
Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
title_fullStr |
Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
title_full_unstemmed |
Coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
title_sort |
coupled carbon and nitrogen losses in response to seven years of chronic warming in subarctic soils |
publishDate |
2019 |
url |
https://hdl.handle.net/10067/1602310151162165141 https://repository.uantwerpen.be/docman/irua/19cd5a/160231_2020_01_01.pdf |
genre |
Iceland Subarctic |
genre_facet |
Iceland Subarctic |
op_source |
0038-0717 Soil biology and biochemistry |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/J.SOILBIO.2019.03.028 info:eu-repo/semantics/altIdentifier/isi/000467508000018 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/J.SOILBIO.2019.03.028 |
container_title |
Soil Biology and Biochemistry |
container_volume |
134 |
container_start_page |
152 |
op_container_end_page |
161 |
_version_ |
1771546792183201792 |