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Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes

Rinne, Janne LU ; Tuittila, Eeva Stiina; Peltola, Olli; Li, Xuefei; Raivonen, Maarit; Alekseychik, Pavel; Haapanala, Sami; Pihlatie, Mari; Aurela, Mika and Mammarella, Ivan, et al. (2018) In Global Biogeochemical Cycles 32(7). p.1087-1106
Abstract

We have analyzed decade-long methane flux data set from a boreal fen, Siikaneva, together with data on environmental parameters and carbon dioxide exchange. The methane flux showed seasonal cycle but no systematic diel cycle. The highest fluxes were observed in July–August with average value of 73 nmol m−2 s−1. Wintertime fluxes were small but positive, with January–March average of 6.7 nmol m−2 s−1. Daily average methane emission correlated best with peat temperatures at 20–35 cm depths. The second highest correlation was with gross primary production (GPP). The best correspondence between emission algorithm and measured fluxes was found for a variable-slope generalized linear model... (More)

We have analyzed decade-long methane flux data set from a boreal fen, Siikaneva, together with data on environmental parameters and carbon dioxide exchange. The methane flux showed seasonal cycle but no systematic diel cycle. The highest fluxes were observed in July–August with average value of 73 nmol m−2 s−1. Wintertime fluxes were small but positive, with January–March average of 6.7 nmol m−2 s−1. Daily average methane emission correlated best with peat temperatures at 20–35 cm depths. The second highest correlation was with gross primary production (GPP). The best correspondence between emission algorithm and measured fluxes was found for a variable-slope generalized linear model (r2 = 0.89) with peat temperature at 35 cm depth and GPP as explanatory variables, slopes varying between years. The homogeneity of slope approach indicated that seasonal variation explained 79% of the sum of squares variation of daily average methane emission, the interannual variation in explanatory factors 7.0%, functional change 5.3%, and random variation 9.1%. Significant correlation between interannual variability of growing season methane emission and that of GPP indicates that on interannual time scales GPP controls methane emission variability, crucially for development of process-based methane emission models. Annual methane emission ranged from 6.0 to 14 gC m−2 and was 2.7 ± 0.4% of annual GPP. Over 10-year period methane emission was 18% of net ecosystem exchange as carbon. The weak relation of methane emission to water table position indicates that space-to-time analogy, used to extrapolate spatial chamber data in time, may not be applicable in seasonal time scales.

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Contribution to journal
publication status
published
subject
keywords
carbon dioxide, flux, greenhouse gas, methane, peatland, wetland
in
Global Biogeochemical Cycles
volume
32
issue
7
pages
20 pages
publisher
American Geophysical Union
external identifiers
  • scopus:85044404415
ISSN
0886-6236
DOI
10.1029/2017GB005747
language
English
LU publication?
yes
id
fd98c117-95f9-4063-a427-df4f8ec85831
date added to LUP
2019-05-08 10:52:16
date last changed
2019-08-14 04:36:09
@article{fd98c117-95f9-4063-a427-df4f8ec85831,
  abstract     = {<p>We have analyzed decade-long methane flux data set from a boreal fen, Siikaneva, together with data on environmental parameters and carbon dioxide exchange. The methane flux showed seasonal cycle but no systematic diel cycle. The highest fluxes were observed in July–August with average value of 73 nmol m<sup>−2</sup> s<sup>−1</sup>. Wintertime fluxes were small but positive, with January–March average of 6.7 nmol m<sup>−2</sup> s<sup>−1</sup>. Daily average methane emission correlated best with peat temperatures at 20–35 cm depths. The second highest correlation was with gross primary production (GPP). The best correspondence between emission algorithm and measured fluxes was found for a variable-slope generalized linear model (r<sup>2</sup> = 0.89) with peat temperature at 35 cm depth and GPP as explanatory variables, slopes varying between years. The homogeneity of slope approach indicated that seasonal variation explained 79% of the sum of squares variation of daily average methane emission, the interannual variation in explanatory factors 7.0%, functional change 5.3%, and random variation 9.1%. Significant correlation between interannual variability of growing season methane emission and that of GPP indicates that on interannual time scales GPP controls methane emission variability, crucially for development of process-based methane emission models. Annual methane emission ranged from 6.0 to 14 gC m<sup>−2</sup> and was 2.7 ± 0.4% of annual GPP. Over 10-year period methane emission was 18% of net ecosystem exchange as carbon. The weak relation of methane emission to water table position indicates that space-to-time analogy, used to extrapolate spatial chamber data in time, may not be applicable in seasonal time scales.</p>},
  author       = {Rinne, Janne and Tuittila, Eeva Stiina and Peltola, Olli and Li, Xuefei and Raivonen, Maarit and Alekseychik, Pavel and Haapanala, Sami and Pihlatie, Mari and Aurela, Mika and Mammarella, Ivan and Vesala, Timo},
  issn         = {0886-6236},
  keyword      = {carbon dioxide,flux,greenhouse gas,methane,peatland,wetland},
  language     = {eng},
  month        = {07},
  number       = {7},
  pages        = {1087--1106},
  publisher    = {American Geophysical Union},
  series       = {Global Biogeochemical Cycles},
  title        = {Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes},
  url          = {http://dx.doi.org/10.1029/2017GB005747},
  volume       = {32},
  year         = {2018},
}