Two years of CH4 and CO2 flux measurements in a wetland in north-east Poland. CH4 emissions 29 ± 4 g m−2 yr−1 in wetter year and 20 ± 1 g m−2 yr−1 in drier year. CO2 uptake 980 ± 150 g m−2 yr−1 in wetter year and 560 ± 130 g m−2 yr−1 in drier year. These annual exchanges are well within ranges found for other temperate wetlands.