Temporal variability of methane emission from a raised bog in Western Siberia
E.E. Veretennikova1,2, E.A. Dyukarev1,3, I.V. Kuryina1
1Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
2Siberian State Medical University, Tomsk, Russia
3Federal State Educational Institution of Higher Professional Education "Ugra State University", Hanty-Mansijsk, Russia
Keywords: Western Siberia, oligotrophic bog, methane emission, temperature of peat deposits
Abstract
The data on the seasonal variability of CH4 fluxes from an oligotrophic anthropogenically disturbed bog in Western Siberia (south of the Tomsk region) are analyzed. Methane fluxes were measured using the close static chamber method. The results show a strong variation in CH4 (from -0.07 to 4.40 mg × m2 h). The total CH4 flux from the bog surface varied from 0.99 to 2.94 g × m-2 depending on the growing season. The seasonal dynamics of CH4 fluxes are characterized by a summer maximum and are closely related to the peat temperature. The use of an exponential function of the peat temperature at different depths explains 81-95% of the variability of the CH4 flux. In general, our data show the importance of studying the CH4 emission from the surface of bog ecosystems under the anthropogenic load. Comprehensive monitoring will make it possible to clarify the contribution of Western Siberian bogs of this type to the global climate change.
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