Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses
Increasing temperatures can accelerate soil organic matter decomposition and release large amounts of CO₂ to the atmosphere, potentially inducing positive warming feedbacks. Alterations to the temperature sensitivity and physiological functioning of soil microorganisms may play a key role in these c...
Published in: | Biogeochemistry |
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Language: | English |
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2018
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Online Access: | https://ddd.uab.cat/record/189368 |
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ftuabarcelonapb:oai:ddd.uab.cat:189368 2023-05-15T15:13:44+02:00 Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses Marañón Jiménez, Sara Soong, Jennifer L. Leblans, Niki I. W. Sigurdsson, Bjarni D. Peñuelas, Josep Richter, Andreas Asensio, Dolores Fransen, E. 2018 application/pdf https://ddd.uab.cat/record/189368 eng eng European Commission 291780 European Commission 610028 Ministerio de Economía y Competitividad CGL2014-52838-C2-1-R Biogeochemistry Vol. 138, issue 3 (May 2018), p. 245-260 https://ddd.uab.cat/record/189368 urn:10.1007/s10533-018-0443-0 urn:oai:ddd.uab.cat:189368 urn:scopus_id:85045431205 urn:wos_id:000433339900002 urn:altmetric_id:37951681 urn:oai:egreta.uab.cat:publications/6fb5d2dd-1f80-4a3f-b109-82bb5d5b5930 open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ Soil CO2 fluxes Q10 Soil respiration Temperature increase Metabolic quotient Microbial biomass Microbial physiology Article 2018 ftuabarcelonapb 2023-02-06T21:14:09Z Increasing temperatures can accelerate soil organic matter decomposition and release large amounts of CO₂ to the atmosphere, potentially inducing positive warming feedbacks. Alterations to the temperature sensitivity and physiological functioning of soil microorganisms may play a key role in these carbon (C) losses. Geothermally active areas in Iceland provide stable and continuous soil temperature gradients to test this hypothesis, encompassing the full range of warming scenarios projected by the Intergovernmental Panel on Climate Change for the northern region. We took soils from these geothermal sites 7 years after the onset of warming and incubated them at varying temperatures and substrate availability conditions to detect persistent alterations of microbial physiology to long-term warming. Seven years of continuous warming ranging from 1.8 to 15.9 °C triggered a 8.6-58.0% decrease on the C concentrations in the topsoil (0-10 cm) of these sub-arctic silt-loam Andosols. The sensitivity of microbial respiration to temperature (Q₁₀) was not altered. However, soil microbes showed a persistent increase in their microbial metabolic quotients (microbial respiration per unit of microbial biomass) and a subsequent diminished C retention in biomass. After an initial depletion of labile soil C upon soil warming, increasing energy costs of metabolic maintenance and resource acquisition led to a weaker capacity of C stabilization in the microbial biomass of warmer soils. This mechanism contributes to our understanding of the acclimated response of soil respiration to in situ soil warming at the ecosystem level, despite a lack of acclimation at the physiological level. Persistent increases in the respiratory costs of soil microbes in response to warming constitute a fundamental process that should be incorporated into climate change-C cycling models. Article in Journal/Newspaper Arctic Climate change Iceland Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB Arctic Biogeochemistry 138 3 245 260 |
institution |
Open Polar |
collection |
Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
op_collection_id |
ftuabarcelonapb |
language |
English |
topic |
Soil CO2 fluxes Q10 Soil respiration Temperature increase Metabolic quotient Microbial biomass Microbial physiology |
spellingShingle |
Soil CO2 fluxes Q10 Soil respiration Temperature increase Metabolic quotient Microbial biomass Microbial physiology Marañón Jiménez, Sara Soong, Jennifer L. Leblans, Niki I. W. Sigurdsson, Bjarni D. Peñuelas, Josep Richter, Andreas Asensio, Dolores Fransen, E. Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses |
topic_facet |
Soil CO2 fluxes Q10 Soil respiration Temperature increase Metabolic quotient Microbial biomass Microbial physiology |
description |
Increasing temperatures can accelerate soil organic matter decomposition and release large amounts of CO₂ to the atmosphere, potentially inducing positive warming feedbacks. Alterations to the temperature sensitivity and physiological functioning of soil microorganisms may play a key role in these carbon (C) losses. Geothermally active areas in Iceland provide stable and continuous soil temperature gradients to test this hypothesis, encompassing the full range of warming scenarios projected by the Intergovernmental Panel on Climate Change for the northern region. We took soils from these geothermal sites 7 years after the onset of warming and incubated them at varying temperatures and substrate availability conditions to detect persistent alterations of microbial physiology to long-term warming. Seven years of continuous warming ranging from 1.8 to 15.9 °C triggered a 8.6-58.0% decrease on the C concentrations in the topsoil (0-10 cm) of these sub-arctic silt-loam Andosols. The sensitivity of microbial respiration to temperature (Q₁₀) was not altered. However, soil microbes showed a persistent increase in their microbial metabolic quotients (microbial respiration per unit of microbial biomass) and a subsequent diminished C retention in biomass. After an initial depletion of labile soil C upon soil warming, increasing energy costs of metabolic maintenance and resource acquisition led to a weaker capacity of C stabilization in the microbial biomass of warmer soils. This mechanism contributes to our understanding of the acclimated response of soil respiration to in situ soil warming at the ecosystem level, despite a lack of acclimation at the physiological level. Persistent increases in the respiratory costs of soil microbes in response to warming constitute a fundamental process that should be incorporated into climate change-C cycling models. |
format |
Article in Journal/Newspaper |
author |
Marañón Jiménez, Sara Soong, Jennifer L. Leblans, Niki I. W. Sigurdsson, Bjarni D. Peñuelas, Josep Richter, Andreas Asensio, Dolores Fransen, E. |
author_facet |
Marañón Jiménez, Sara Soong, Jennifer L. Leblans, Niki I. W. Sigurdsson, Bjarni D. Peñuelas, Josep Richter, Andreas Asensio, Dolores Fransen, E. |
author_sort |
Marañón Jiménez, Sara |
title |
Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses |
title_short |
Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses |
title_full |
Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses |
title_fullStr |
Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses |
title_full_unstemmed |
Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses |
title_sort |
geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial c losses |
publishDate |
2018 |
url |
https://ddd.uab.cat/record/189368 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Iceland |
genre_facet |
Arctic Climate change Iceland |
op_relation |
European Commission 291780 European Commission 610028 Ministerio de Economía y Competitividad CGL2014-52838-C2-1-R Biogeochemistry Vol. 138, issue 3 (May 2018), p. 245-260 https://ddd.uab.cat/record/189368 urn:10.1007/s10533-018-0443-0 urn:oai:ddd.uab.cat:189368 urn:scopus_id:85045431205 urn:wos_id:000433339900002 urn:altmetric_id:37951681 urn:oai:egreta.uab.cat:publications/6fb5d2dd-1f80-4a3f-b109-82bb5d5b5930 |
op_rights |
open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ |
container_title |
Biogeochemistry |
container_volume |
138 |
container_issue |
3 |
container_start_page |
245 |
op_container_end_page |
260 |
_version_ |
1766344269179650048 |