Effect of peat quality on microbial greenhouse gas formation in an acidic fen
Peatlands play an important role in the global carbon cycle and represent both an important stock of soil carbon and a substantial natural source of relevant greenhouse gases like CO2 and CH4. While it is known that the quality of organic matter affects microbial degradation and mineralization proce...
Published in: | Biogeosciences |
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Copernicus Publications
2010
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00029395 2023-05-15T17:58:05+02:00 Effect of peat quality on microbial greenhouse gas formation in an acidic fen Reiche, M. Gleixner, G. Küsel, K. 2010-01 electronic https://doi.org/10.5194/bg-7-187-2010 https://noa.gwlb.de/receive/cop_mods_00029395 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029350/bg-7-187-2010.pdf https://bg.copernicus.org/articles/7/187/2010/bg-7-187-2010.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-7-187-2010 https://noa.gwlb.de/receive/cop_mods_00029395 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029350/bg-7-187-2010.pdf https://bg.copernicus.org/articles/7/187/2010/bg-7-187-2010.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2010 ftnonlinearchiv https://doi.org/10.5194/bg-7-187-2010 2022-02-08T22:47:46Z Peatlands play an important role in the global carbon cycle and represent both an important stock of soil carbon and a substantial natural source of relevant greenhouse gases like CO2 and CH4. While it is known that the quality of organic matter affects microbial degradation and mineralization processes in peatlands, the manner in which the quality of peat organic matter affects the formation of CO2 and CH4 remains unclear. In this study we developed a fast and simple peat quality index in order to estimate its potential greenhouse gas formation by linking the thermo-degradability of peat with potential anaerobic CO2 and CH4 formation rates. Peat samples were obtained at several depths (0–40 cm) at four sampling locations from an acidic fen (pH 4.7). CO2 and CH4 formation rates were highly spatially variable and depended on depth, sampling location, and the composition of pyrolysable organic matter. Peat samples active in CO2 and CH4 formation had a quality index above 1.35, and the fraction of thermally labile pyrolyzable organic matter (comparable to easily available carbon substrates for microbial activity) obtained by thermogravimetry was above 35%. Curie-point pyrolysis-gas chromatography/mass spectrometry mainly identified carbohydrates and lignin as pyrolysis products in these samples, indicating that undecomposed organic matter was found in this fraction. In contrast, lipids and unspecific pyrolysis products, which indicate recalcitrant and highly decomposed organic matter, correlated significantly with lower CO2 formation and reduced methanogenesis. Our results suggest that undecomposed organic matter is a prerequisite for CH4 and CO2 development in acidic fens. Furthermore, the new peat quality index should aide the estimation of potential greenhouse gas formation resulting from peatland restoration and permafrost thawing and help yield more robust models of trace gas fluxes from peatlands for climate change research. Article in Journal/Newspaper permafrost Niedersächsisches Online-Archiv NOA Curie Point ENVELOPE(-63.483,-63.483,-64.833,-64.833) Biogeosciences 7 1 187 198 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Reiche, M. Gleixner, G. Küsel, K. Effect of peat quality on microbial greenhouse gas formation in an acidic fen |
topic_facet |
article Verlagsveröffentlichung |
description |
Peatlands play an important role in the global carbon cycle and represent both an important stock of soil carbon and a substantial natural source of relevant greenhouse gases like CO2 and CH4. While it is known that the quality of organic matter affects microbial degradation and mineralization processes in peatlands, the manner in which the quality of peat organic matter affects the formation of CO2 and CH4 remains unclear. In this study we developed a fast and simple peat quality index in order to estimate its potential greenhouse gas formation by linking the thermo-degradability of peat with potential anaerobic CO2 and CH4 formation rates. Peat samples were obtained at several depths (0–40 cm) at four sampling locations from an acidic fen (pH 4.7). CO2 and CH4 formation rates were highly spatially variable and depended on depth, sampling location, and the composition of pyrolysable organic matter. Peat samples active in CO2 and CH4 formation had a quality index above 1.35, and the fraction of thermally labile pyrolyzable organic matter (comparable to easily available carbon substrates for microbial activity) obtained by thermogravimetry was above 35%. Curie-point pyrolysis-gas chromatography/mass spectrometry mainly identified carbohydrates and lignin as pyrolysis products in these samples, indicating that undecomposed organic matter was found in this fraction. In contrast, lipids and unspecific pyrolysis products, which indicate recalcitrant and highly decomposed organic matter, correlated significantly with lower CO2 formation and reduced methanogenesis. Our results suggest that undecomposed organic matter is a prerequisite for CH4 and CO2 development in acidic fens. Furthermore, the new peat quality index should aide the estimation of potential greenhouse gas formation resulting from peatland restoration and permafrost thawing and help yield more robust models of trace gas fluxes from peatlands for climate change research. |
format |
Article in Journal/Newspaper |
author |
Reiche, M. Gleixner, G. Küsel, K. |
author_facet |
Reiche, M. Gleixner, G. Küsel, K. |
author_sort |
Reiche, M. |
title |
Effect of peat quality on microbial greenhouse gas formation in an acidic fen |
title_short |
Effect of peat quality on microbial greenhouse gas formation in an acidic fen |
title_full |
Effect of peat quality on microbial greenhouse gas formation in an acidic fen |
title_fullStr |
Effect of peat quality on microbial greenhouse gas formation in an acidic fen |
title_full_unstemmed |
Effect of peat quality on microbial greenhouse gas formation in an acidic fen |
title_sort |
effect of peat quality on microbial greenhouse gas formation in an acidic fen |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/bg-7-187-2010 https://noa.gwlb.de/receive/cop_mods_00029395 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029350/bg-7-187-2010.pdf https://bg.copernicus.org/articles/7/187/2010/bg-7-187-2010.pdf |
long_lat |
ENVELOPE(-63.483,-63.483,-64.833,-64.833) |
geographic |
Curie Point |
geographic_facet |
Curie Point |
genre |
permafrost |
genre_facet |
permafrost |
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-7-187-2010 https://noa.gwlb.de/receive/cop_mods_00029395 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00029350/bg-7-187-2010.pdf https://bg.copernicus.org/articles/7/187/2010/bg-7-187-2010.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-7-187-2010 |
container_title |
Biogeosciences |
container_volume |
7 |
container_issue |
1 |
container_start_page |
187 |
op_container_end_page |
198 |
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1766166627948167168 |