Small spatial variability in methane emission measured from a wet patterned boreal bog
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 c...
Main Authors: | , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2018-03-01
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Series: | Biogeosciences |
Online Access: | https://www.biogeosciences.net/15/1749/2018/bg-15-1749-2018.pdf |
Summary: | 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.<br><br>
The plant community types differed from each other in their water level,
species composition, total leaf area (LAI<sub>TOT</sub>) and leaf area of
aerenchymatous plant species (LAI<sub>AER</sub>). Methane emissions ranged
from −309 to 1254 mg m<sup>−2</sup> d<sup>−1</sup>. Although methane fluxes
increased with increasing peat temperature, LAI<sub>TOT</sub> and
LAI<sub>AER</sub>, 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.<br><br>
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 LAI<sub>AER</sub> and LAI<sub>TOT</sub> 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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ISSN: | 1726-4170 1726-4189 |