Methane Production in a West Siberian Eutrophic Fen Is Much Higher than Carbon Dioxide Production: Incubation of Peat Samples,Stoichiometry, Stable Isotope Dynamics,Modeling

Water Resources - Homoacetogenic bacteria can play an important role in anaerobic degradation of organic matter in peatlands at low temperatures. However, little is known about the conditions when...     

Methane emission from municipal solid waste landfills

Methane fluxes from municipal solid waste landfills in Surgut and Khanty-Mansiysk are assessed in August 2015 by the inverse modeling method. It is revealed that the methane flux values vary from 0.3 to 5.8 g CH₄/(m² hour). The highest value of the methane flux is typical of a landfill that is currently used for the waste disposal and is not covered with the soil layer, whereas the lowest value was obtained for a closed small-capacity landfill covered with soil and vegetation.     

Methane emission from West Siberian forest-steppe and subtaiga reed fens

Methane emission from West Siberian forest-steppe and subtaiga reed fens (that is, fens dominated by Phragmites australis) observed in summer 2013, is considered using the static chamber method. The obtained medians of CH₄ fluxes varied from -0.08 to 2.7 mg CH₄/m² per hour. Eenvironmental factors affecting methane emission are analyzed. It was found that CH₄ emissions from the reed fens correlate only with the concentration of salt ions in the wetland water and with the plant community structure. The latter probably also depends on water salinity. It was revealed that in fens the ratio between fluxes of CH₄ and CO₂ does not depend on the water table level that contradicts the general pattern simulated by mathematical models of CH₄ emission. It was found that Phragmites australis fens and similar ecosystems should be considered as a separate wetland class from the point of view of methane emission study.     

Response of Methane Emission to Temperature Anomalies of Mires: Case Study of the Southern Taiga in Western Siberia

Water Resources - In the summer and autumn of 2017, anomalously high methane fluxes were measured using the chamber method on oligotrophic, mesotrophic, and eutrophic mires in the southern taiga in...     

A new map of wetlands in the southern taiga of the West Siberia for assessing the emission of methane and carbon dioxide

A typological map of wetlands in the southern taiga of West Siberia has been compiled based on high-resolution Landsat images. In accordance with the new map, the area of southern-taiga wetlands is estimated at 12.02 Mha at the total wetland area percentage in the subzone estimated at 28%. The final accuracy of determination of various wetland classes is 80%. The use of the new map improved the estimates of methane emissions from southern-taiga wetlands from 0.84 to 1.57 MtCH₄/year, i.e., by 87%. The respiration of wetland ecosystems in the southern taiga of the West Siberia is estimated at 67 MtCO₂/year.