Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils
Rapid climatic changes, rising air temperatures, and increased fires are expected to drive permafrost degradation and alter soil carbon (C) cycling in many high-latitude ecosystems. How these soils will respond to changes in their temperature, moisture, and overlying vegetation is uncertain but crit...
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Copernicus Publications
2016
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011009 2023-05-15T17:57:20+02:00 Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils Bond-Lamberty, Ben Smith, A. Peyton Bailey, Vanessa 2016-12 electronic https://doi.org/10.5194/bg-13-6669-2016 https://noa.gwlb.de/receive/cop_mods_00011009 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010966/bg-13-6669-2016.pdf https://bg.copernicus.org/articles/13/6669/2016/bg-13-6669-2016.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-6669-2016 https://noa.gwlb.de/receive/cop_mods_00011009 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010966/bg-13-6669-2016.pdf https://bg.copernicus.org/articles/13/6669/2016/bg-13-6669-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/bg-13-6669-2016 2022-02-08T22:56:43Z Rapid climatic changes, rising air temperatures, and increased fires are expected to drive permafrost degradation and alter soil carbon (C) cycling in many high-latitude ecosystems. How these soils will respond to changes in their temperature, moisture, and overlying vegetation is uncertain but critical to understand given the large soil C stocks in these regions. We used a laboratory experiment to examine how temperature and moisture control CO2 and CH4 emissions from mineral soils sampled from the bottom of the annual active layer, i.e., directly above permafrost, in an Alaskan boreal forest. Gas emissions from 30 cores, subjected to two temperatures and either field moisture conditions or experimental drought, were tracked over a 100-day incubation; we also measured a variety of physical and chemical characteristics of the cores. Gravimetric water content was 0.31 ± 0.12 (unitless) at the beginning of the incubation; cores at field moisture were unchanged at the end, but drought cores had declined to 0.06 ± 0.04. Daily CO2 fluxes were positively correlated with incubation chamber temperature, core water content, and percent soil nitrogen. They also had a temperature sensitivity (Q10) of 1.3 and 1.9 for the field moisture and drought treatments, respectively. Daily CH4 emissions were most strongly correlated with percent nitrogen, but neither temperature nor water content was a significant first-order predictor of CH4 fluxes. The cumulative production of C from CO2 was over 6 orders of magnitude higher than that from CH4; cumulative CO2 was correlated with incubation temperature and moisture treatment, with drought cores producing 52–73 % lower C. Cumulative CH4 production was unaffected by any treatment. These results suggest that deep active-layer soils may be sensitive to changes in soil moisture under aerobic conditions, a critical factor as discontinuous permafrost thaws in interior Alaska. Deep but unfrozen high-latitude soils have been shown to be strongly affected by long-term experimental warming, and these results provide insight into their future dynamics and feedback potential with future climate change. Article in Journal/Newspaper permafrost Alaska Niedersächsisches Online-Archiv NOA Biogeosciences 13 24 6669 6681 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Bond-Lamberty, Ben Smith, A. Peyton Bailey, Vanessa Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
topic_facet |
article Verlagsveröffentlichung |
description |
Rapid climatic changes, rising air temperatures, and increased fires are expected to drive permafrost degradation and alter soil carbon (C) cycling in many high-latitude ecosystems. How these soils will respond to changes in their temperature, moisture, and overlying vegetation is uncertain but critical to understand given the large soil C stocks in these regions. We used a laboratory experiment to examine how temperature and moisture control CO2 and CH4 emissions from mineral soils sampled from the bottom of the annual active layer, i.e., directly above permafrost, in an Alaskan boreal forest. Gas emissions from 30 cores, subjected to two temperatures and either field moisture conditions or experimental drought, were tracked over a 100-day incubation; we also measured a variety of physical and chemical characteristics of the cores. Gravimetric water content was 0.31 ± 0.12 (unitless) at the beginning of the incubation; cores at field moisture were unchanged at the end, but drought cores had declined to 0.06 ± 0.04. Daily CO2 fluxes were positively correlated with incubation chamber temperature, core water content, and percent soil nitrogen. They also had a temperature sensitivity (Q10) of 1.3 and 1.9 for the field moisture and drought treatments, respectively. Daily CH4 emissions were most strongly correlated with percent nitrogen, but neither temperature nor water content was a significant first-order predictor of CH4 fluxes. The cumulative production of C from CO2 was over 6 orders of magnitude higher than that from CH4; cumulative CO2 was correlated with incubation temperature and moisture treatment, with drought cores producing 52–73 % lower C. Cumulative CH4 production was unaffected by any treatment. These results suggest that deep active-layer soils may be sensitive to changes in soil moisture under aerobic conditions, a critical factor as discontinuous permafrost thaws in interior Alaska. Deep but unfrozen high-latitude soils have been shown to be strongly affected by long-term experimental warming, and these results provide insight into their future dynamics and feedback potential with future climate change. |
format |
Article in Journal/Newspaper |
author |
Bond-Lamberty, Ben Smith, A. Peyton Bailey, Vanessa |
author_facet |
Bond-Lamberty, Ben Smith, A. Peyton Bailey, Vanessa |
author_sort |
Bond-Lamberty, Ben |
title |
Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
title_short |
Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
title_full |
Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
title_fullStr |
Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
title_full_unstemmed |
Temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
title_sort |
temperature and moisture effects on greenhouse gas emissions from deep active-layer boreal soils |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-6669-2016 https://noa.gwlb.de/receive/cop_mods_00011009 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010966/bg-13-6669-2016.pdf https://bg.copernicus.org/articles/13/6669/2016/bg-13-6669-2016.pdf |
genre |
permafrost Alaska |
genre_facet |
permafrost Alaska |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-6669-2016 https://noa.gwlb.de/receive/cop_mods_00011009 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010966/bg-13-6669-2016.pdf https://bg.copernicus.org/articles/13/6669/2016/bg-13-6669-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-13-6669-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
24 |
container_start_page |
6669 |
op_container_end_page |
6681 |
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1766165745406836736 |