Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra
Rapid warming of Arctic ecosystems accelerates microbial decomposition of soil organic matter and leads to increased production of carbon dioxide (CO2) and methane (CH4). CH4 oxidation potentially mitigates CH4 emissions from permafrost regions, but it is still highly uncertain whether soils in high...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-15-6621-2018 https://noa.gwlb.de/receive/cop_mods_00004146 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004103/bg-15-6621-2018.pdf https://bg.copernicus.org/articles/15/6621/2018/bg-15-6621-2018.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004146 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004146 2023-05-15T14:54:41+02:00 Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra Zheng, Jianqiu RoyChowdhury, Taniya Yang, Ziming Gu, Baohua Wullschleger, Stan D. Graham, David E. 2018-11 electronic https://doi.org/10.5194/bg-15-6621-2018 https://noa.gwlb.de/receive/cop_mods_00004146 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004103/bg-15-6621-2018.pdf https://bg.copernicus.org/articles/15/6621/2018/bg-15-6621-2018.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-15-6621-2018 https://noa.gwlb.de/receive/cop_mods_00004146 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004103/bg-15-6621-2018.pdf https://bg.copernicus.org/articles/15/6621/2018/bg-15-6621-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/bg-15-6621-2018 2022-02-08T23:00:16Z Rapid warming of Arctic ecosystems accelerates microbial decomposition of soil organic matter and leads to increased production of carbon dioxide (CO2) and methane (CH4). CH4 oxidation potentially mitigates CH4 emissions from permafrost regions, but it is still highly uncertain whether soils in high-latitude ecosystems will function as a net source or sink for CH4 in response to rising temperature and associated hydrological changes. We investigated CH4 production and oxidation potential in permafrost-affected soils from degraded ice-wedge polygons on the Barrow Environmental Observatory, Utqiaġvik (Barrow), Alaska, USA. Frozen soil cores from flat and high-centered polygons were sectioned into organic, transitional, and permafrost layers, and incubated at −2, +4 and +8 ∘C to determine potential CH4 production and oxidation rates. Significant CH4 production was only observed from the suboxic transition layer and permafrost of flat-centered polygon soil. These two soil sections also exhibited highest CH4 oxidation potentials. Organic soils from relatively dry surface layers had the lowest CH4 oxidation potential compared to saturated transition layer and permafrost, contradicting our original assumptions. Low methanogenesis rates are due to low overall microbial activities measured as total anaerobic respiration and the competing iron-reduction process. Our results suggest that CH4 oxidation could offset CH4 production and limit surface CH4 emissions, in response to elevated temperature, and thus must be considered in model predictions of net CH4 fluxes in Arctic polygonal tundra. Future changes in temperature and soil saturation conditions are likely to divert electron flow to alternative electron acceptors and significantly alter CH4 production, which should also be considered in CH4 models. Article in Journal/Newspaper Arctic Barrow Ice permafrost Tundra wedge* Alaska Niedersächsisches Online-Archiv NOA Arctic Biogeosciences 15 21 6621 6635 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Zheng, Jianqiu RoyChowdhury, Taniya Yang, Ziming Gu, Baohua Wullschleger, Stan D. Graham, David E. Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra |
topic_facet |
article Verlagsveröffentlichung |
description |
Rapid warming of Arctic ecosystems accelerates microbial decomposition of soil organic matter and leads to increased production of carbon dioxide (CO2) and methane (CH4). CH4 oxidation potentially mitigates CH4 emissions from permafrost regions, but it is still highly uncertain whether soils in high-latitude ecosystems will function as a net source or sink for CH4 in response to rising temperature and associated hydrological changes. We investigated CH4 production and oxidation potential in permafrost-affected soils from degraded ice-wedge polygons on the Barrow Environmental Observatory, Utqiaġvik (Barrow), Alaska, USA. Frozen soil cores from flat and high-centered polygons were sectioned into organic, transitional, and permafrost layers, and incubated at −2, +4 and +8 ∘C to determine potential CH4 production and oxidation rates. Significant CH4 production was only observed from the suboxic transition layer and permafrost of flat-centered polygon soil. These two soil sections also exhibited highest CH4 oxidation potentials. Organic soils from relatively dry surface layers had the lowest CH4 oxidation potential compared to saturated transition layer and permafrost, contradicting our original assumptions. Low methanogenesis rates are due to low overall microbial activities measured as total anaerobic respiration and the competing iron-reduction process. Our results suggest that CH4 oxidation could offset CH4 production and limit surface CH4 emissions, in response to elevated temperature, and thus must be considered in model predictions of net CH4 fluxes in Arctic polygonal tundra. Future changes in temperature and soil saturation conditions are likely to divert electron flow to alternative electron acceptors and significantly alter CH4 production, which should also be considered in CH4 models. |
format |
Article in Journal/Newspaper |
author |
Zheng, Jianqiu RoyChowdhury, Taniya Yang, Ziming Gu, Baohua Wullschleger, Stan D. Graham, David E. |
author_facet |
Zheng, Jianqiu RoyChowdhury, Taniya Yang, Ziming Gu, Baohua Wullschleger, Stan D. Graham, David E. |
author_sort |
Zheng, Jianqiu |
title |
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra |
title_short |
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra |
title_full |
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra |
title_fullStr |
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra |
title_full_unstemmed |
Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra |
title_sort |
impacts of temperature and soil characteristics on methane production and oxidation in arctic tundra |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-6621-2018 https://noa.gwlb.de/receive/cop_mods_00004146 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004103/bg-15-6621-2018.pdf https://bg.copernicus.org/articles/15/6621/2018/bg-15-6621-2018.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Ice permafrost Tundra wedge* Alaska |
genre_facet |
Arctic Barrow Ice permafrost Tundra wedge* 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-15-6621-2018 https://noa.gwlb.de/receive/cop_mods_00004146 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004103/bg-15-6621-2018.pdf https://bg.copernicus.org/articles/15/6621/2018/bg-15-6621-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-15-6621-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
21 |
container_start_page |
6621 |
op_container_end_page |
6635 |
_version_ |
1766326448393551872 |