Advanced

Biotic controls on CO2 and CH4 exchange in wetlands - a closed environment study

Christensen, Torben LU ; Panikov, N; Mastepanov, Mikhail LU ; Joabsson, A; Stewart, A; Oquist, M; Sommerkorn, M; Reynaud, S and Svensson, B (2003) In Biogeochemistry 64(3). p.337-354
Abstract
Wetlands are significant sources of the important greenhouse gas CH4. Here we explore the use of an experimental system developed for the determination of continuous fluxes of CO2 and CH4 in closed ecosystem monoliths including the capture of (CO2)-C-14 and (CH4)-C-14 following pulse labelling with (CO2)-C-14. We show that, in the ecosystem studied, ebullition (bubble emission) may account for 18 to 50% of the total CH4 emission, representing fluxes that have been difficult to estimate accurately in the past. Furthermore, using plant removal and C-14 labelling techniques, we use the system to detail the direct influence of vascular plants on CH4 emission. This influence is observed to be dependent on the amount of vascular plants present.... (More)
Wetlands are significant sources of the important greenhouse gas CH4. Here we explore the use of an experimental system developed for the determination of continuous fluxes of CO2 and CH4 in closed ecosystem monoliths including the capture of (CO2)-C-14 and (CH4)-C-14 following pulse labelling with (CO2)-C-14. We show that, in the ecosystem studied, ebullition (bubble emission) may account for 18 to 50% of the total CH4 emission, representing fluxes that have been difficult to estimate accurately in the past. Furthermore, using plant removal and C-14 labelling techniques, we use the system to detail the direct influence of vascular plants on CH4 emission. This influence is observed to be dependent on the amount of vascular plants present. The results that may be produced using the presented experimental set-up have implications for an improved understanding of wetland ecosystem/atmosphere interactions, including possible feedback effects on climate change. In recent years much attention has been devoted to ascertaining and subsequently using the relationship between net ecosystem productivity and CH4 emission as a basis for extrapolation of fluxes across large areas. The experimental system presented may be used to study the complex relationship between vascular plants and CH4 emission and here we show examples of how this may vary considerably in nature between and even within ecosystems. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
controlled environment studies, C-14 labelling, CO2 exchange, emissions, peatlands, methane
in
Biogeochemistry
volume
64
issue
3
pages
337 - 354
publisher
Springer
external identifiers
  • wos:000184414800003
  • scopus:0041473554
ISSN
1573-515X
DOI
10.1023/A:1024913730848
language
English
LU publication?
yes
id
7d3e9ddc-06b3-4d60-a51e-e024af020ad1 (old id 305768)
date added to LUP
2007-08-28 09:34:26
date last changed
2018-10-03 11:28:42
@article{7d3e9ddc-06b3-4d60-a51e-e024af020ad1,
  abstract     = {Wetlands are significant sources of the important greenhouse gas CH4. Here we explore the use of an experimental system developed for the determination of continuous fluxes of CO2 and CH4 in closed ecosystem monoliths including the capture of (CO2)-C-14 and (CH4)-C-14 following pulse labelling with (CO2)-C-14. We show that, in the ecosystem studied, ebullition (bubble emission) may account for 18 to 50% of the total CH4 emission, representing fluxes that have been difficult to estimate accurately in the past. Furthermore, using plant removal and C-14 labelling techniques, we use the system to detail the direct influence of vascular plants on CH4 emission. This influence is observed to be dependent on the amount of vascular plants present. The results that may be produced using the presented experimental set-up have implications for an improved understanding of wetland ecosystem/atmosphere interactions, including possible feedback effects on climate change. In recent years much attention has been devoted to ascertaining and subsequently using the relationship between net ecosystem productivity and CH4 emission as a basis for extrapolation of fluxes across large areas. The experimental system presented may be used to study the complex relationship between vascular plants and CH4 emission and here we show examples of how this may vary considerably in nature between and even within ecosystems.},
  author       = {Christensen, Torben and Panikov, N and Mastepanov, Mikhail and Joabsson, A and Stewart, A and Oquist, M and Sommerkorn, M and Reynaud, S and Svensson, B},
  issn         = {1573-515X},
  keyword      = {controlled environment studies,C-14 labelling,CO2 exchange,emissions,peatlands,methane},
  language     = {eng},
  number       = {3},
  pages        = {337--354},
  publisher    = {Springer},
  series       = {Biogeochemistry},
  title        = {Biotic controls on CO2 and CH4 exchange in wetlands - a closed environment study},
  url          = {http://dx.doi.org/10.1023/A:1024913730848},
  volume       = {64},
  year         = {2003},
}