Diurnal Variations in Methane Emissions from West Siberia Peatlands in Summer

E. E. Veretennikova and E. A. Dyukarev

New data on the diurnal variability of methane emission in summer (2013–2014) from West Siberia peatland ecosystems are presented. It is demonstrated that diurnal variations in methane emission differ much depending on a peatland ecosystem under study. Diurnal variations in methane emission in the fens and hollows of the ridge-hollow complex (RHC) are revealed as well as their reproducibility in 2013–2014. The maximum emission is registered in the daytime, and the minimum is observed at night. There is no diurnal variation in methane emission in ryams (pine bogs) and ridges of RHC. It is revealed that in the upper layer of peat (at the depth up to 10 cm for hollows and at the depth of 2 and 5 cm for fens) the contribution of temperature variability to methane emission variations in fens and hollows is 15–20%. The multiple linear regression with peat temperature at several depths allows explaining 44–54% of the variability of methane flux from peatlands. No significant correlation between methane fluxes and the temperature of peat and air was identified in the diurnal cycle in ryams and ridges.