ИСТИНА

In this presentation, we report the main results of our estimation of methane formation and emission in dominant landscapes of typical tundra. The study area is located in Western Yamal. The landscape structure of the representative area of typical tundra was studied, and landscape map was compiled. Soils of the active layer and upper permafrost were sampled within all dominant landscapes. Methane concentration was measured for every sample, and total methane content in the active layer and upper permafrost was evaluated. The highest methane content was observed in mires and ravines. Peatlands, well-drained tundra, wet tundra, and sand fields were characterized by the lowest methane content. Thus, mires and ravines are the main sources of methane emission in typical tundra. Daily methane flux in these landscapes reaches 10 to 20 mg/m2.