Emission and Uptake of Greenhouse Gases by Peatland Ecosystems of the Licensed Areas of Salym Oilfield in the Nefteyugansk District of the Khanty-Mansi Autonomous Okrug

This paper summarizes the results of field studies on carbon dioxide and methane fluxes in peatland ecosystems in the territory of licensed areas of the Salym group of oilfields (Khanty-Mansi Autonomous Okrug). The largest fluxes of carbon dioxide and methane are observed in mesotrophic and eutrophic peatlands, which are characterized by the maximum of biomass storages. Significant negative CO₂ fluxes (‒1161.6 mg CO₂ m^–2 h^–1) associated with photosynthesis have been recorded from here, but they also have a high emission component of carbon exchange (ecosystem respiration) (more than 680 mg CO₂ m^–2 h^–1). Methane emission reaches 23.9 mg CH₄ m^–2 h^–1. In oligotrophic peatlands, fluxes of СО₂ range from ‒400 to –600 mg CO₂ m^–2 h^–1 in the daytime and from +160 to +840 mg CO₂ m^–2 h^–1 at night. Up to 1.1 mg CH₄ m^–2 h^–1 is emitted from the elevations of bogs and 3.9 mg CH₄ m^–2 h^–1 from depressions. Large carbon dioxide and methane fluxes were found from rights-of-way at a pine–dwarf-shrub–sphagnum peatland, where, depending on the vegetation cover, the release of CO₂ can be from +46 to +480 mg CO₂ m^–2 h^–1 and emission of CH₄ can reach 4.6 mg CH₄ m^–2 h^–1.