Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation
Permafrost-affected tundra soils are significant sources of the climate-relevant trace gas methane (CH 4 ). The observed accelerated warming of the arctic will cause deeper permafrost thawing, followed by increased carbon mineralization and CH 4 formation in water-saturated tundra soils, thus creati...
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ftdoajarticles:oai:doaj.org/article:bd056cd438e344d3b545cc29ae750d46 2023-05-15T14:58:11+02:00 Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation I. Preuss C. Knoblauch J. Gebert E.-M. Pfeiffer 2013-04-01T00:00:00Z https://doi.org/10.5194/bg-10-2539-2013 https://doaj.org/article/bd056cd438e344d3b545cc29ae750d46 EN eng Copernicus Publications http://www.biogeosciences.net/10/2539/2013/bg-10-2539-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-2539-2013 1726-4170 1726-4189 https://doaj.org/article/bd056cd438e344d3b545cc29ae750d46 Biogeosciences, Vol 10, Iss 4, Pp 2539-2552 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-2539-2013 2022-12-31T03:02:11Z Permafrost-affected tundra soils are significant sources of the climate-relevant trace gas methane (CH 4 ). The observed accelerated warming of the arctic will cause deeper permafrost thawing, followed by increased carbon mineralization and CH 4 formation in water-saturated tundra soils, thus creating a positive feedback to climate change. Aerobic CH 4 oxidation is regarded as the key process reducing CH 4 emissions from wetlands, but quantification of turnover rates has remained difficult so far. The application of carbon stable isotope fractionation enables the in situ quantification of CH 4 oxidation efficiency in arctic wetland soils. The aim of the current study is to quantify CH 4 oxidation efficiency in permafrost-affected tundra soils in Russia's Lena River delta based on stable isotope signatures of CH 4 . Therefore, depth profiles of CH 4 concentrations and δ 13 CH 4 signatures were measured and the fractionation factors for the processes of oxidation (α ox ) and diffusion (α diff ) were determined. Most previous studies employing stable isotope fractionation for the quantification of CH 4 oxidation in soils of other habitats (such as landfill cover soils) have assumed a gas transport dominated by advection (α trans = 1). In tundra soils, however, diffusion is the main gas transport mechanism and diffusive stable isotope fractionation should be considered alongside oxidative fractionation. For the first time, the stable isotope fractionation of CH 4 diffusion through water-saturated soils was determined with an α diff = 1.001 ± 0.000 ( n = 3). CH 4 stable isotope fractionation during diffusion through air-filled pores of the investigated polygonal tundra soils was α diff = 1.013 ± 0.003 ( n = 18). Furthermore, it was found that α ox differs widely between sites and horizons (mean α ox = 1.017 ± 0.009) and needs to be determined on a case by case basis. The impact of both fractionation factors on the quantification of CH 4 oxidation was analyzed by considering both the potential diffusion rate under ... Article in Journal/Newspaper Arctic Climate change lena river permafrost Tundra Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 10 4 2539 2552 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 I. Preuss C. Knoblauch J. Gebert E.-M. Pfeiffer Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Permafrost-affected tundra soils are significant sources of the climate-relevant trace gas methane (CH 4 ). The observed accelerated warming of the arctic will cause deeper permafrost thawing, followed by increased carbon mineralization and CH 4 formation in water-saturated tundra soils, thus creating a positive feedback to climate change. Aerobic CH 4 oxidation is regarded as the key process reducing CH 4 emissions from wetlands, but quantification of turnover rates has remained difficult so far. The application of carbon stable isotope fractionation enables the in situ quantification of CH 4 oxidation efficiency in arctic wetland soils. The aim of the current study is to quantify CH 4 oxidation efficiency in permafrost-affected tundra soils in Russia's Lena River delta based on stable isotope signatures of CH 4 . Therefore, depth profiles of CH 4 concentrations and δ 13 CH 4 signatures were measured and the fractionation factors for the processes of oxidation (α ox ) and diffusion (α diff ) were determined. Most previous studies employing stable isotope fractionation for the quantification of CH 4 oxidation in soils of other habitats (such as landfill cover soils) have assumed a gas transport dominated by advection (α trans = 1). In tundra soils, however, diffusion is the main gas transport mechanism and diffusive stable isotope fractionation should be considered alongside oxidative fractionation. For the first time, the stable isotope fractionation of CH 4 diffusion through water-saturated soils was determined with an α diff = 1.001 ± 0.000 ( n = 3). CH 4 stable isotope fractionation during diffusion through air-filled pores of the investigated polygonal tundra soils was α diff = 1.013 ± 0.003 ( n = 18). Furthermore, it was found that α ox differs widely between sites and horizons (mean α ox = 1.017 ± 0.009) and needs to be determined on a case by case basis. The impact of both fractionation factors on the quantification of CH 4 oxidation was analyzed by considering both the potential diffusion rate under ... |
format |
Article in Journal/Newspaper |
author |
I. Preuss C. Knoblauch J. Gebert E.-M. Pfeiffer |
author_facet |
I. Preuss C. Knoblauch J. Gebert E.-M. Pfeiffer |
author_sort |
I. Preuss |
title |
Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
title_short |
Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
title_full |
Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
title_fullStr |
Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
title_full_unstemmed |
Improved quantification of microbial CH 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
title_sort |
improved quantification of microbial ch 4 oxidation efficiency in arctic wetland soils using carbon isotope fractionation |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-2539-2013 https://doaj.org/article/bd056cd438e344d3b545cc29ae750d46 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change lena river permafrost Tundra |
genre_facet |
Arctic Climate change lena river permafrost Tundra |
op_source |
Biogeosciences, Vol 10, Iss 4, Pp 2539-2552 (2013) |
op_relation |
http://www.biogeosciences.net/10/2539/2013/bg-10-2539-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-2539-2013 1726-4170 1726-4189 https://doaj.org/article/bd056cd438e344d3b545cc29ae750d46 |
op_doi |
https://doi.org/10.5194/bg-10-2539-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
4 |
container_start_page |
2539 |
op_container_end_page |
2552 |
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1766330272011255808 |