Abstract
The paper presents results of a two-year study on methane emission carried out in lysimetric station situated on Kuwasy peatland in the Biebrza River valley. The aim of this study was to estimate the amount of methane emission from peat-muck soil in relation to ground water level and fertilisation. Methane emission was determined with the chamber method using photo-acoustic probe. Methane emission significantly depended on the ground water level. The largest CH4 emission was found at full saturation of soil with water. With the decrease of ground water table the emission of methane decreased. Mineral fertilisation increased CH4 emission. At ground water table depth of 50 cm, CH4 emission from fertilised variant was by 42.3% bigger than from non-fertilised variant. Peat-muck soils overgrown by meadows in the Biebrza River valley were found to be an important source of methane emission. In the vegetation period at ground water table depths of 0, 25, 50 and 75 cm methane emission was 502, 361, 198, 141 kg·ha –1 ·(210 d) –1 , respectively.
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