Temporal Variability of Methane Emission from a Raised Bog in Western Siberia

Seasonal variability of CH 4 fluxes from an oligotrophic anthropogenically disturbed bog in western Siberia (south of Tomsk oblast) is analyzed. Methane fluxes were measured by the closed static chamber method. The results show a strong variation in CH 4 (from −0.07 to 4.40 mg m −2 h −1 ). The total CH 4 flux from the bog surface during the vegetation season varies from 0.99 to 2.94 g m −2 . The seasonal dynamics of CH 4 fluxes are characterized by a summer maximum and is strongly connected with the peat temperature. The use of an exponential function of the peat temperature at different depths explains 81–95% of the variability of the CH 4 flux. In general, our data show the importance of studying the CH 4 emission from the surface of bog ecosystems under the anthropogenic load. The comprehensive monitoring is to allow estimating the contribution of Western Siberian bogs of this type to global climate change.