Pertti J. Martikainen , Hannu Nykänen, Patrick Crill, Jouko Silvola

The effect of changing water table on methane fluxes at two Finnish mire sites

Martikainen P. J., Nykänen H., Crill P., Silvola J. The effect of changing water table on methane fluxes at two Finnish mire sites.

Tiivistelmä

Methane fluxes were measured using a static chamber technique on a minerotrophic fen and an ombrotrophic peat bog site located on the Lak-kasuo mire complex in central Finland. Both sites consisted of a virgin area and an area drained in 1961 by ditching. The measurements in 1991 were made biweekly from spring thaw to winter freezing. During this period, the mean CH4 emission from the virgin minerotrophic site and virgin ombrotrophic site was 98 mg m-2 d-1 and 40 mg m-2 d-1 , respectively. The mean emission of CH4 from the drained ombrotrophic site was 18 mg m-2 d-1. The drained minerotrophic site consumed methane during most of the measuring period, the average uptake was 0.13 mg m-2 d-1. Draining had lowered the average water table by 4 cm at the ombrotrophic site and by 20 cm at minerotrophic site. The possible reasons for the different development of the water table and methane fluxes at ombrotrophic and minerotrophic sites after draining are discussed. Keywords: Drainage, methane flux, methane oxidation, nutrient status, peat soil

Avainsanat
peat soil; Drainage; nutrient status; methane flux; methane oxidation

Vastaanotettu 31.10.2017 Julkaistu 1.1.1992

Katselukerrat 3417

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