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Decadal vegetation changes in a northern peatland, greenhouse gas fluxes and net radiative forcing

Johansson, T; Malmer, Nils LU ; Crill, P M; Friborg, T; Åkerman, Jonas LU ; Mastepanov, Mikhail LU and Christensen, Torben LU (2006) In Global Change Biology 12(12). p.2352-2369
Abstract
Thawing permafrost in the sub-Arctic has implications for the physical stability and biological dynamics of peatland ecosystems. This study provides an analysis of how permafrost thawing and subsequent vegetation changes in a sub-Arctic Swedish mire have changed the net exchange of greenhouse gases, carbon dioxide (CO2) and CH4 over the past three decades. Images of the mire (ca. 17 ha) and surroundings taken with film sensitive in the visible and the near infrared portion of the spectrum, [i.e. colour infrared (CIR) aerial photographs from 1970 and 2000] were used. The results show that during this period the area covered by hummock vegetation decreased by more than 11% and became replaced by wet-growing plant communities. The overall net... (More)
Thawing permafrost in the sub-Arctic has implications for the physical stability and biological dynamics of peatland ecosystems. This study provides an analysis of how permafrost thawing and subsequent vegetation changes in a sub-Arctic Swedish mire have changed the net exchange of greenhouse gases, carbon dioxide (CO2) and CH4 over the past three decades. Images of the mire (ca. 17 ha) and surroundings taken with film sensitive in the visible and the near infrared portion of the spectrum, [i.e. colour infrared (CIR) aerial photographs from 1970 and 2000] were used. The results show that during this period the area covered by hummock vegetation decreased by more than 11% and became replaced by wet-growing plant communities. The overall net uptake of C in the vegetation and the release of C by heterotrophic respiration might have increased resulting in increases in both the growing season atmospheric CO2 sink function with about 16% and the CH4 emissions with 22%. Calculating the flux as CO2 equivalents show that the mire in 2000 has a 47% greater radiative forcing on the atmosphere using a 100-year time horizon. Northern peatlands in areas with thawing sporadic or discontinuous permafrost are likely to act as larger greenhouse gas sources over the growing season today than a few decades ago because of increased CH4 emissions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
peatland, permafrost, Sweden, northern, GWP, greenhouse gases, aerial CIR photography, carbon balance, radiative forcing, sub-Arctic, vegetation, change
in
Global Change Biology
volume
12
issue
12
pages
2352 - 2369
publisher
Wiley-Blackwell
external identifiers
  • wos:000242659400010
  • scopus:33845273318
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2006.01267.x
language
English
LU publication?
yes
id
5e3d406a-5dc2-412e-a50c-145119a13675 (old id 164464)
date added to LUP
2007-07-02 11:03:54
date last changed
2019-08-18 03:34:51
@article{5e3d406a-5dc2-412e-a50c-145119a13675,
  abstract     = {Thawing permafrost in the sub-Arctic has implications for the physical stability and biological dynamics of peatland ecosystems. This study provides an analysis of how permafrost thawing and subsequent vegetation changes in a sub-Arctic Swedish mire have changed the net exchange of greenhouse gases, carbon dioxide (CO2) and CH4 over the past three decades. Images of the mire (ca. 17 ha) and surroundings taken with film sensitive in the visible and the near infrared portion of the spectrum, [i.e. colour infrared (CIR) aerial photographs from 1970 and 2000] were used. The results show that during this period the area covered by hummock vegetation decreased by more than 11% and became replaced by wet-growing plant communities. The overall net uptake of C in the vegetation and the release of C by heterotrophic respiration might have increased resulting in increases in both the growing season atmospheric CO2 sink function with about 16% and the CH4 emissions with 22%. Calculating the flux as CO2 equivalents show that the mire in 2000 has a 47% greater radiative forcing on the atmosphere using a 100-year time horizon. Northern peatlands in areas with thawing sporadic or discontinuous permafrost are likely to act as larger greenhouse gas sources over the growing season today than a few decades ago because of increased CH4 emissions.},
  author       = {Johansson, T and Malmer, Nils and Crill, P M and Friborg, T and Åkerman, Jonas and Mastepanov, Mikhail and Christensen, Torben},
  issn         = {1354-1013},
  keyword      = {peatland,permafrost,Sweden,northern,GWP,greenhouse gases,aerial CIR photography,carbon balance,radiative forcing,sub-Arctic,vegetation,change},
  language     = {eng},
  number       = {12},
  pages        = {2352--2369},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Decadal vegetation changes in a northern peatland, greenhouse gas fluxes and net radiative forcing},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2006.01267.x},
  volume       = {12},
  year         = {2006},
}