Methane exchange at the peatland forest floor - automatic chamber system exposes the dynamics of small fluxes

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http://hdl.handle.net/10138/184736

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Korkiakoski , M , Tuovinen , J-P , Aurela , M , Koskinen , M , Minkkinen , K , Ojanen , P , Penttila , T , Rainne , J , Laurila , T & Lohila , A 2017 , ' Methane exchange at the peatland forest floor - automatic chamber system exposes the dynamics of small fluxes ' , Biogeosciences , vol. 14 , no. 7 , pp. 1947-1967 . https://doi.org/10.5194/bg-14-1947-2017

Title: Methane exchange at the peatland forest floor - automatic chamber system exposes the dynamics of small fluxes
Author: Korkiakoski, Mika; Tuovinen, Juha-Pekka; Aurela, Mika; Koskinen, Markku; Minkkinen, Kari; Ojanen, Paavo; Penttila, Timo; Rainne, Juuso; Laurila, Tuomas; Lohila, Annalea
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Forest Ecology and Management
Date: 2017-04-10
Language: eng
Number of pages: 21
Belongs to series: Biogeosciences
ISSN: 1726-4170
URI: http://hdl.handle.net/10138/184736
Abstract: We measured methane (CH4) exchange rates with automatic chambers at the forest floor of a nutrient-rich drained peatland in 2011-2013. The fen, located in southern Finland, was drained for forestry in 1969 and the tree stand is now a mixture of Scots pine, Norway spruce, and pubescent birch. Our measurement system consisted of six transparent chambers and stainless steel frames, positioned on a number of different field and moss layer compositions. Gas concentrations were measured with an online cavity ring-down spectroscopy gas analyzer. Fluxes were calculated with both linear and exponential regression. The use of linear regression resulted in systematically smaller CH4 fluxes by 10-45% as compared to exponential regression. However, the use of exponential regression with small fluxes (
Subject: ATMOSPHERE GAS-EXCHANGE
NITROUS-OXIDE EMISSIONS
STATIC CHAMBERS
CARBON-DIOXIDE
CH4 EMISSIONS
WATER-TABLE
NUMERICAL EVALUATION
DRAINED PEATLANDS
BOREAL PEATLANDS
EDDY COVARIANCE
4112 Forestry
1172 Environmental sciences
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