Abstract
The authors compiled and analyzed experimental data on the distribution of methane content in the soils of the lower Don steppe province (the south of Rostov oblast) and the subzone of typical (average) taiga (Karelia), forest-bog landscapes of Arkhangelsk, Pskov and Moscow oblasts. The data from the literature were also involved. Investigations revealed relatively low concentrations of methane (average of 0.18 µg/g of sample) in drained soils of tundra, taiga forest and steppe zones, and transition zones between forest and steppe, with a trend of increasing its amount from steppe zone to taiga with increasing soil moisture. Higher concentrations of methane (1–2 orders of magnitude higher) are typical for soils of waterlogged sites and peat deposits of bogs. The distribution along the vertical profile of methane in dry and temporarily flooded soils is characterized by a reduction of its concentrations from the surface to the lower horizons, while in peat deposits of bogs, the concentration of gas, by contrast, increases significantly with depth.
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