The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland
This paper investigates how vascular plants affect carbon flow and the formation and emission of the greenhouse gas methane (CH4 ) in an arctic wet tundra ecosystem in NE Greenland. We present a field experiment where we studied, in particular, how species-specific root exudation patterns affect the...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2003
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/da/publications/the-effect-of-vascular-plants-on-carbon-turnover-and-methane-emissions-from-a-tundra-wetland(2f7f77f0-c21e-406b-9484-273a774e085c).html |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/2f7f77f0-c21e-406b-9484-273a774e085c |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/2f7f77f0-c21e-406b-9484-273a774e085c 2023-05-15T15:00:32+02:00 The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland Strom, L Ekberg, A Mastepanov, M Christensen, TR 2003-08 https://pure.au.dk/portal/da/publications/the-effect-of-vascular-plants-on-carbon-turnover-and-methane-emissions-from-a-tundra-wetland(2f7f77f0-c21e-406b-9484-273a774e085c).html eng eng info:eu-repo/semantics/restrictedAccess Strom , L , Ekberg , A , Mastepanov , M & Christensen , TR 2003 , ' The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland ' , Global change biology , vol. 9 , no. 8 , pp. 1185-1192 . acetate arctic wetlands methane emission methanogens substrate quality vascular plant effects BOREAL PEATLANDS CH4 FLUX OXIDATION CO2 ERIOPHORUM TRANSPORT KINETICS EXCHANGE REMOVAL CLIMATE article 2003 ftuniaarhuspubl 2021-05-12T22:44:35Z This paper investigates how vascular plants affect carbon flow and the formation and emission of the greenhouse gas methane (CH4 ) in an arctic wet tundra ecosystem in NE Greenland. We present a field experiment where we studied, in particular, how species-specific root exudation patterns affect the availability of acetate, a hypothesized precursor of CH4 formation. We found significantly higher acetate formation rates in the root vicinity of Eriophorum scheuchzeri compared with another dominating sedge in the wetland, i.e. Dupontia psilosantha . Furthermore a shading treatment, which reduced net photosynthesis, resulted in significantly decreased formation rates of acetate. We also found that the potential CH4 production of the peat profile was highly positively correlated to the concentration of acetate at the respective depths, whereas it was negatively correlated to the concentration of total dissolved organic carbon. This suggests that acetate is a substrate of importance to the methanogens in the studied ecosystem and that acetate concentration in this case can serve as a predictor of substrate quality. To further investigate the importance of acetate as a predecessor to CH4 , we brought an intact peat-plant monolith system collected at the field site in NE Greenland to the laboratory, sealed it hermetically and studied the decomposition of (14) C-labelled acetate injected at the depth of methanogenic activity. After 4 h, (14) CH4 emission from the monolith could be observed. In conclusion, allocation of recently fixed carbon to the roots of certain species of vascular plants affects substrate quality and influence CH4 formation. Article in Journal/Newspaper Arctic Dupontia psilosantha Eriophorum Eriophorum scheuchzeri Greenland Tundra Aarhus University: Research Arctic Greenland Monolith ENVELOPE(163.283,163.283,-66.950,-66.950) The Monolith ENVELOPE(-57.955,-57.955,-63.897,-63.897) |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
acetate arctic wetlands methane emission methanogens substrate quality vascular plant effects BOREAL PEATLANDS CH4 FLUX OXIDATION CO2 ERIOPHORUM TRANSPORT KINETICS EXCHANGE REMOVAL CLIMATE |
spellingShingle |
acetate arctic wetlands methane emission methanogens substrate quality vascular plant effects BOREAL PEATLANDS CH4 FLUX OXIDATION CO2 ERIOPHORUM TRANSPORT KINETICS EXCHANGE REMOVAL CLIMATE Strom, L Ekberg, A Mastepanov, M Christensen, TR The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
topic_facet |
acetate arctic wetlands methane emission methanogens substrate quality vascular plant effects BOREAL PEATLANDS CH4 FLUX OXIDATION CO2 ERIOPHORUM TRANSPORT KINETICS EXCHANGE REMOVAL CLIMATE |
description |
This paper investigates how vascular plants affect carbon flow and the formation and emission of the greenhouse gas methane (CH4 ) in an arctic wet tundra ecosystem in NE Greenland. We present a field experiment where we studied, in particular, how species-specific root exudation patterns affect the availability of acetate, a hypothesized precursor of CH4 formation. We found significantly higher acetate formation rates in the root vicinity of Eriophorum scheuchzeri compared with another dominating sedge in the wetland, i.e. Dupontia psilosantha . Furthermore a shading treatment, which reduced net photosynthesis, resulted in significantly decreased formation rates of acetate. We also found that the potential CH4 production of the peat profile was highly positively correlated to the concentration of acetate at the respective depths, whereas it was negatively correlated to the concentration of total dissolved organic carbon. This suggests that acetate is a substrate of importance to the methanogens in the studied ecosystem and that acetate concentration in this case can serve as a predictor of substrate quality. To further investigate the importance of acetate as a predecessor to CH4 , we brought an intact peat-plant monolith system collected at the field site in NE Greenland to the laboratory, sealed it hermetically and studied the decomposition of (14) C-labelled acetate injected at the depth of methanogenic activity. After 4 h, (14) CH4 emission from the monolith could be observed. In conclusion, allocation of recently fixed carbon to the roots of certain species of vascular plants affects substrate quality and influence CH4 formation. |
format |
Article in Journal/Newspaper |
author |
Strom, L Ekberg, A Mastepanov, M Christensen, TR |
author_facet |
Strom, L Ekberg, A Mastepanov, M Christensen, TR |
author_sort |
Strom, L |
title |
The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
title_short |
The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
title_full |
The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
title_fullStr |
The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
title_full_unstemmed |
The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
title_sort |
effect of vascular plants on carbon turnover and methane emissions from a tundra wetland |
publishDate |
2003 |
url |
https://pure.au.dk/portal/da/publications/the-effect-of-vascular-plants-on-carbon-turnover-and-methane-emissions-from-a-tundra-wetland(2f7f77f0-c21e-406b-9484-273a774e085c).html |
long_lat |
ENVELOPE(163.283,163.283,-66.950,-66.950) ENVELOPE(-57.955,-57.955,-63.897,-63.897) |
geographic |
Arctic Greenland Monolith The Monolith |
geographic_facet |
Arctic Greenland Monolith The Monolith |
genre |
Arctic Dupontia psilosantha Eriophorum Eriophorum scheuchzeri Greenland Tundra |
genre_facet |
Arctic Dupontia psilosantha Eriophorum Eriophorum scheuchzeri Greenland Tundra |
op_source |
Strom , L , Ekberg , A , Mastepanov , M & Christensen , TR 2003 , ' The effect of vascular plants on carbon turnover and methane emissions from a tundra wetland ' , Global change biology , vol. 9 , no. 8 , pp. 1185-1192 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766332626556157952 |