Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland
Here we present results from a field experiment in an Arctic wetland situated in Zackenberg, NE Greenland. During one growing season we investigated how dominance of the sedge Eriophorum scheuchzeri affected the below-ground concentrations of low molecular weight carbon compounds (LMWOC) and the flu...
Published in: | Soil Biology and Biochemistry |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2012
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Online Access: | https://lup.lub.lu.se/record/2409845 https://doi.org/10.1016/j.soilbio.2011.09.005 https://portal.research.lu.se/files/45732109/Str_m_et_al_2012_SBB.pdf |
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ftulundlup:oai:lup.lub.lu.se:5ac73443-26c2-4de6-83de-e7c8c16bab5d 2023-05-15T14:50:08+02:00 Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland Ström, Lena Tagesson, Torbern Mastepanov, Mikhail Christensen, Torben 2012 application/pdf https://lup.lub.lu.se/record/2409845 https://doi.org/10.1016/j.soilbio.2011.09.005 https://portal.research.lu.se/files/45732109/Str_m_et_al_2012_SBB.pdf eng eng Elsevier https://lup.lub.lu.se/record/2409845 http://dx.doi.org/10.1016/j.soilbio.2011.09.005 https://portal.research.lu.se/files/45732109/Str_m_et_al_2012_SBB.pdf wos:000299983700008 scopus:80755148740 info:eu-repo/semantics/openAccess Soil Biology & Biochemistry; 45, pp 61-70 (2012) ISSN: 0038-0717 Physical Geography Organic acids Carbohydrates Amino acids Wetlands Arctic CO2 flux CH4 flux Eriophorum Dupontia Carex contributiontojournal/article info:eu-repo/semantics/article text 2012 ftulundlup https://doi.org/10.1016/j.soilbio.2011.09.005 2023-02-01T23:26:40Z Here we present results from a field experiment in an Arctic wetland situated in Zackenberg, NE Greenland. During one growing season we investigated how dominance of the sedge Eriophorum scheuchzeri affected the below-ground concentrations of low molecular weight carbon compounds (LMWOC) and the fluxes of CO2 and CH4 in comparison to dominance of other sedges (Carex stans and Dupontia psilosantha). Three groups of LMWOC were analysed using liquid chromatography-ionspray tandem mass spectrometry, i.e., organic acids (OAs), amino acids (AAs) and simple carbohydrates (CHs). To identify the effect of plant composition the experiments were carried out in a continuous fen area with very little between species variation in environmental conditions, e.g., water-table and active layer thickness and soil temperature. The pool of labile LMWOC compounds in this Arctic fen was dominated by OAs, constituting between 75 and 83% of the total pore water pool of OAs. CHs and Ms. The dominant OA was acetic acid, an easily available substrate for methanogens, which constituted >= 85% of the OA pool. We estimated that the concentration of acetic acid found in pore water would support 2 -2.5 h of CH4 flux and an additional continuous input of acetic acid through root exudation that would support 1.3-1.5 h of CH4 flux. Thus, the results clearly points to the importance of a continuous input for acetoclastic methanogenesis to be sustainable. Additionally, Eriophorum had a very strong effect on parts of the carbon cycle in the Arctic fen. The mean seasonal CH4 flux was twice as high in Eriophorum dominated plots, most likely due to a 1.7 times higher concentration of OAs in these plots. Further, the ecosystem respiration was 1.3 times higher in Eriophorum dominated plots. In conclusion, the results offer further support to the importance of certain vascular plant species for the carbon cycle of wetland ecosystems. (C) 2011 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Arctic Dupontia psilosantha Eriophorum Eriophorum scheuchzeri Greenland Zackenberg Lund University Publications (LUP) Arctic Greenland Soil Biology and Biochemistry 45 61 70 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Physical Geography Organic acids Carbohydrates Amino acids Wetlands Arctic CO2 flux CH4 flux Eriophorum Dupontia Carex |
spellingShingle |
Physical Geography Organic acids Carbohydrates Amino acids Wetlands Arctic CO2 flux CH4 flux Eriophorum Dupontia Carex Ström, Lena Tagesson, Torbern Mastepanov, Mikhail Christensen, Torben Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland |
topic_facet |
Physical Geography Organic acids Carbohydrates Amino acids Wetlands Arctic CO2 flux CH4 flux Eriophorum Dupontia Carex |
description |
Here we present results from a field experiment in an Arctic wetland situated in Zackenberg, NE Greenland. During one growing season we investigated how dominance of the sedge Eriophorum scheuchzeri affected the below-ground concentrations of low molecular weight carbon compounds (LMWOC) and the fluxes of CO2 and CH4 in comparison to dominance of other sedges (Carex stans and Dupontia psilosantha). Three groups of LMWOC were analysed using liquid chromatography-ionspray tandem mass spectrometry, i.e., organic acids (OAs), amino acids (AAs) and simple carbohydrates (CHs). To identify the effect of plant composition the experiments were carried out in a continuous fen area with very little between species variation in environmental conditions, e.g., water-table and active layer thickness and soil temperature. The pool of labile LMWOC compounds in this Arctic fen was dominated by OAs, constituting between 75 and 83% of the total pore water pool of OAs. CHs and Ms. The dominant OA was acetic acid, an easily available substrate for methanogens, which constituted >= 85% of the OA pool. We estimated that the concentration of acetic acid found in pore water would support 2 -2.5 h of CH4 flux and an additional continuous input of acetic acid through root exudation that would support 1.3-1.5 h of CH4 flux. Thus, the results clearly points to the importance of a continuous input for acetoclastic methanogenesis to be sustainable. Additionally, Eriophorum had a very strong effect on parts of the carbon cycle in the Arctic fen. The mean seasonal CH4 flux was twice as high in Eriophorum dominated plots, most likely due to a 1.7 times higher concentration of OAs in these plots. Further, the ecosystem respiration was 1.3 times higher in Eriophorum dominated plots. In conclusion, the results offer further support to the importance of certain vascular plant species for the carbon cycle of wetland ecosystems. (C) 2011 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Ström, Lena Tagesson, Torbern Mastepanov, Mikhail Christensen, Torben |
author_facet |
Ström, Lena Tagesson, Torbern Mastepanov, Mikhail Christensen, Torben |
author_sort |
Ström, Lena |
title |
Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland |
title_short |
Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland |
title_full |
Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland |
title_fullStr |
Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland |
title_full_unstemmed |
Presence of Eriophorum scheuchzeri enhances substrate availability and methane emission in an Arctic wetland |
title_sort |
presence of eriophorum scheuchzeri enhances substrate availability and methane emission in an arctic wetland |
publisher |
Elsevier |
publishDate |
2012 |
url |
https://lup.lub.lu.se/record/2409845 https://doi.org/10.1016/j.soilbio.2011.09.005 https://portal.research.lu.se/files/45732109/Str_m_et_al_2012_SBB.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Dupontia psilosantha Eriophorum Eriophorum scheuchzeri Greenland Zackenberg |
genre_facet |
Arctic Dupontia psilosantha Eriophorum Eriophorum scheuchzeri Greenland Zackenberg |
op_source |
Soil Biology & Biochemistry; 45, pp 61-70 (2012) ISSN: 0038-0717 |
op_relation |
https://lup.lub.lu.se/record/2409845 http://dx.doi.org/10.1016/j.soilbio.2011.09.005 https://portal.research.lu.se/files/45732109/Str_m_et_al_2012_SBB.pdf wos:000299983700008 scopus:80755148740 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.soilbio.2011.09.005 |
container_title |
Soil Biology and Biochemistry |
container_volume |
45 |
container_start_page |
61 |
op_container_end_page |
70 |
_version_ |
1766321197703757824 |