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Small spatial variability in methane emission measured from a wet patterned boreal bog

Korrensalo, Aino; Männistö, Elisa; Alekseychik, Pavel; Mammarella, Ivan; Rinne, Janne LU ; Vesala, Timo and Tuittila, Eeva Stiina (2018) In Biogeosciences 15(6). p.1749-1761
Abstract

We measured methane fluxes of a patterned bog situated in Siikaneva in southern Finland from six different plant community types in three growing seasons (2012-2014) using the static chamber method with chamber exposure of 35 min. A mixed-effects model was applied to quantify the effect of the controlling factors on the methane flux.The plant community types differed from each other in their water level, species composition, total leaf area (LAITOT) and leaf area of aerenchymatous plant species (LAIAER). Methane emissions ranged from-309 to 1254 mg m-2 d-1. Although methane fluxes increased with increasing peat temperature, LAITOT and LAIAER, they had no correlation with water table or with plant community type.... (More)

We measured methane fluxes of a patterned bog situated in Siikaneva in southern Finland from six different plant community types in three growing seasons (2012-2014) using the static chamber method with chamber exposure of 35 min. A mixed-effects model was applied to quantify the effect of the controlling factors on the methane flux.The plant community types differed from each other in their water level, species composition, total leaf area (LAITOT) and leaf area of aerenchymatous plant species (LAIAER). Methane emissions ranged from-309 to 1254 mg m-2 d-1. Although methane fluxes increased with increasing peat temperature, LAITOT and LAIAER, they had no correlation with water table or with plant community type. The only exception was higher fluxes from hummocks and high lawns than from high hummocks and bare peat surfaces in 2013 and from bare peat surfaces than from high hummocks in 2014. Chamber fluxes upscaled to ecosystem level for the peak season were of the same magnitude as the fluxes measured with the eddy covariance (EC) technique. In 2012 and in August 2014 there was a good agreement between the two methods; in 2013 and in July 2014, the chamber fluxes were higher than the EC fluxes.Net fluxes to soil, indicating higher methane oxidation than production, were detected every year and in all community types. Our results underline the importance of both LAIAER and LAITOT in controlling methane fluxes and indicate the need for automatized chambers to reliably capture localized events to support the more robust EC method.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biogeosciences
volume
15
issue
6
pages
13 pages
publisher
Copernicus Publications
external identifiers
  • scopus:85044427678
ISSN
1726-4170
DOI
10.5194/bg-15-1749-2018
language
English
LU publication?
yes
id
7e355c2e-b2ba-4143-a11a-5475d5ff2d52
date added to LUP
2018-05-22 12:40:38
date last changed
2019-08-14 04:16:43
@article{7e355c2e-b2ba-4143-a11a-5475d5ff2d52,
  abstract     = {<p>We measured methane fluxes of a patterned bog situated in Siikaneva in southern Finland from six different plant community types in three growing seasons (2012-2014) using the static chamber method with chamber exposure of 35 min. A mixed-effects model was applied to quantify the effect of the controlling factors on the methane flux.The plant community types differed from each other in their water level, species composition, total leaf area (LAITOT) and leaf area of aerenchymatous plant species (LAIAER). Methane emissions ranged from-309 to 1254 mg m<sup>-2</sup> d<sup>-1</sup>. Although methane fluxes increased with increasing peat temperature, LAITOT and LAIAER, they had no correlation with water table or with plant community type. The only exception was higher fluxes from hummocks and high lawns than from high hummocks and bare peat surfaces in 2013 and from bare peat surfaces than from high hummocks in 2014. Chamber fluxes upscaled to ecosystem level for the peak season were of the same magnitude as the fluxes measured with the eddy covariance (EC) technique. In 2012 and in August 2014 there was a good agreement between the two methods; in 2013 and in July 2014, the chamber fluxes were higher than the EC fluxes.Net fluxes to soil, indicating higher methane oxidation than production, were detected every year and in all community types. Our results underline the importance of both LAIAER and LAITOT in controlling methane fluxes and indicate the need for automatized chambers to reliably capture localized events to support the more robust EC method.</p>},
  author       = {Korrensalo, Aino and Männistö, Elisa and Alekseychik, Pavel and Mammarella, Ivan and Rinne, Janne and Vesala, Timo and Tuittila, Eeva Stiina},
  issn         = {1726-4170},
  language     = {eng},
  month        = {03},
  number       = {6},
  pages        = {1749--1761},
  publisher    = {Copernicus Publications},
  series       = {Biogeosciences},
  title        = {Small spatial variability in methane emission measured from a wet patterned boreal bog},
  url          = {http://dx.doi.org/10.5194/bg-15-1749-2018},
  volume       = {15},
  year         = {2018},
}