Methane exchange in a boreal forest estimated by gradient method
Sundqvist, Elin LU ; Mölder, Meelis LU ; Crill, Patrick ; Kljun, Natascha LU
and Lindroth, Anders
LU
(2015)
In Tellus. Series B: Chemical and Physical Meteorology
67.
- Abstract
- Forests are generally considered to be net sinks of atmospheric methane (CH4) because of oxidation by methanotrophic bacteria in well-aerated forests soils. However, emissions from wet forest soils, and sometimes canopy fluxes, are often neglected when quantifying the CH4 budget of a forest. We used a modified Bowen ratio method and combined eddy covariance and gradient methods to estimate net CH4 exchange at a boreal forest site in central Sweden. Results indicate that the site is a net source of CH4. This is in contrast to soil, branch and leaf chamber measurements of uptake of CH4. Wetter soils within the footprint of the canopy are thought to be responsible for the discrepancy. We found no evidence for canopy emissions per se. However,... (More)
- Forests are generally considered to be net sinks of atmospheric methane (CH4) because of oxidation by methanotrophic bacteria in well-aerated forests soils. However, emissions from wet forest soils, and sometimes canopy fluxes, are often neglected when quantifying the CH4 budget of a forest. We used a modified Bowen ratio method and combined eddy covariance and gradient methods to estimate net CH4 exchange at a boreal forest site in central Sweden. Results indicate that the site is a net source of CH4. This is in contrast to soil, branch and leaf chamber measurements of uptake of CH4. Wetter soils within the footprint of the canopy are thought to be responsible for the discrepancy. We found no evidence for canopy emissions per se. However, the diel pattern of the CH4 exchange with minimum emissions at daytime correlated well with gross primary production, which supports an uptake in the canopy. More distant source areas could also contribute to the diel pattern; their contribution might be greater at night during stable boundary layer conditions. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7790962
- author
- Sundqvist, Elin
LU
; Mölder, Meelis
LU
; Crill, Patrick
; Kljun, Natascha
LU
and Lindroth, Anders
LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- micrometeorology, Bowen ratio, eddy covariance, footprint, wet soil
- in
- Tellus. Series B: Chemical and Physical Meteorology
- volume
- 67
- article number
- UNSP 26688
- publisher
- Taylor & Francis
- external identifiers
-
- wos:000357606300001
- scopus:84940399120
- ISSN
- 0280-6509
- DOI
- 10.3402/tellusb.v67.26688
- language
- English
- LU publication?
- yes
- id
- 9debb292-cbac-45a6-9613-4b6121ac289a (old id 7790962)
- date added to LUP
- 2016-04-01 14:36:33
- date last changed
- 2024-01-25 03:10:27
@article{9debb292-cbac-45a6-9613-4b6121ac289a,
abstract = {{Forests are generally considered to be net sinks of atmospheric methane (CH4) because of oxidation by methanotrophic bacteria in well-aerated forests soils. However, emissions from wet forest soils, and sometimes canopy fluxes, are often neglected when quantifying the CH4 budget of a forest. We used a modified Bowen ratio method and combined eddy covariance and gradient methods to estimate net CH4 exchange at a boreal forest site in central Sweden. Results indicate that the site is a net source of CH4. This is in contrast to soil, branch and leaf chamber measurements of uptake of CH4. Wetter soils within the footprint of the canopy are thought to be responsible for the discrepancy. We found no evidence for canopy emissions per se. However, the diel pattern of the CH4 exchange with minimum emissions at daytime correlated well with gross primary production, which supports an uptake in the canopy. More distant source areas could also contribute to the diel pattern; their contribution might be greater at night during stable boundary layer conditions.}},
author = {{Sundqvist, Elin and Mölder, Meelis and Crill, Patrick and Kljun, Natascha and Lindroth, Anders}},
issn = {{0280-6509}},
keywords = {{micrometeorology; Bowen ratio; eddy covariance; footprint; wet soil}},
language = {{eng}},
publisher = {{Taylor & Francis}},
series = {{Tellus. Series B: Chemical and Physical Meteorology}},
title = {{Methane exchange in a boreal forest estimated by gradient method}},
url = {{http://dx.doi.org/10.3402/tellusb.v67.26688}},
doi = {{10.3402/tellusb.v67.26688}},
volume = {{67}},
year = {{2015}},
}