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Species-specific effects of vascular plants on carbon turnover and methane emissions from wetlands

Ström, Lena LU ; Mastepanov, Mikhail LU and Christensen, Torben LU (2005) In Biogeochemistry 75(1). p.65-82
Abstract
Species composition affects the carbon turnover and the formation and emission of the greenhouse gas methane (CH4) in wetlands. Here we investigate the individual effects of vascular plant species on the carbon cycling in a wetland ecosystem. We used a novel combination of laboratory methods and controlled environment facilities and studied three different vascular plant species (Eriophorum vaginatum, Carex rostrata and Juncus effusus) collected from the same wetland in southern Sweden. We found distinct differences in the functioning of these wetland sedges in terms of their effects on carbon dioxide (CO2) and CH4 fluxes, bubble emission of CH4, decomposition of C-14-labelled acetate into (CH4)-C-14 and (CO2)-C-14, rhizospheric oxidation... (More)
Species composition affects the carbon turnover and the formation and emission of the greenhouse gas methane (CH4) in wetlands. Here we investigate the individual effects of vascular plant species on the carbon cycling in a wetland ecosystem. We used a novel combination of laboratory methods and controlled environment facilities and studied three different vascular plant species (Eriophorum vaginatum, Carex rostrata and Juncus effusus) collected from the same wetland in southern Sweden. We found distinct differences in the functioning of these wetland sedges in terms of their effects on carbon dioxide (CO2) and CH4 fluxes, bubble emission of CH4, decomposition of C-14-labelled acetate into (CH4)-C-14 and (CO2)-C-14, rhizospheric oxidation of CH4 to CO2 and stimulation of methanogenesis through root exudation of substrate ( e. g., acetate). The results show that the emission of CH4 from peat - plant monoliths was highest when the vegetation was dominated by Carex (6.76 mg CH4 m(-2) h(-1)) than when it was dominated by Eriophorum (2.38 mg CH4 m(-2) h(-1)) or Juncus (2.68 mg CH4 m(-2) h(-1)). Furthermore, the CH4 emission seemed controlled primarily by the degree of rhizospheric CH4 oxidation which was between 20 and 40% for Carex but > 90% for both the other species. Our results point toward a direct and very important linkage between the plant species composition and the functioning of wetland ecosystems and indicate that changes in the species composition may alter important processes relating to controls of and interactions between greenhouse gas fluxes with significant implications for feedback mechanisms in a changing climate as a result. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
substrate quality, methane emission, species composition, acetate, carbon cycling, wetlands
in
Biogeochemistry
volume
75
issue
1
pages
65 - 82
publisher
Springer
external identifiers
  • wos:000233241800005
  • scopus:27744439826
ISSN
1573-515X
DOI
10.1007/s10533-004-6124-1
language
English
LU publication?
yes
id
d4a7a66e-0660-4c7e-aaf8-9915c9b0dfe1 (old id 213318)
date added to LUP
2007-10-05 15:44:42
date last changed
2017-11-05 03:35:30
@article{d4a7a66e-0660-4c7e-aaf8-9915c9b0dfe1,
  abstract     = {Species composition affects the carbon turnover and the formation and emission of the greenhouse gas methane (CH4) in wetlands. Here we investigate the individual effects of vascular plant species on the carbon cycling in a wetland ecosystem. We used a novel combination of laboratory methods and controlled environment facilities and studied three different vascular plant species (Eriophorum vaginatum, Carex rostrata and Juncus effusus) collected from the same wetland in southern Sweden. We found distinct differences in the functioning of these wetland sedges in terms of their effects on carbon dioxide (CO2) and CH4 fluxes, bubble emission of CH4, decomposition of C-14-labelled acetate into (CH4)-C-14 and (CO2)-C-14, rhizospheric oxidation of CH4 to CO2 and stimulation of methanogenesis through root exudation of substrate ( e. g., acetate). The results show that the emission of CH4 from peat - plant monoliths was highest when the vegetation was dominated by Carex (6.76 mg CH4 m(-2) h(-1)) than when it was dominated by Eriophorum (2.38 mg CH4 m(-2) h(-1)) or Juncus (2.68 mg CH4 m(-2) h(-1)). Furthermore, the CH4 emission seemed controlled primarily by the degree of rhizospheric CH4 oxidation which was between 20 and 40% for Carex but > 90% for both the other species. Our results point toward a direct and very important linkage between the plant species composition and the functioning of wetland ecosystems and indicate that changes in the species composition may alter important processes relating to controls of and interactions between greenhouse gas fluxes with significant implications for feedback mechanisms in a changing climate as a result.},
  author       = {Ström, Lena and Mastepanov, Mikhail and Christensen, Torben},
  issn         = {1573-515X},
  keyword      = {substrate quality,methane emission,species composition,acetate,carbon cycling,wetlands},
  language     = {eng},
  number       = {1},
  pages        = {65--82},
  publisher    = {Springer},
  series       = {Biogeochemistry},
  title        = {Species-specific effects of vascular plants on carbon turnover and methane emissions from wetlands},
  url          = {http://dx.doi.org/10.1007/s10533-004-6124-1},
  volume       = {75},
  year         = {2005},
}