Comparative characteristics of the weight moisture content of soils of the seasonally thawed layer on different landscapes in the area of Yakutsk (Kerdugen area)

The response of permafrost, including the rate and extent of changes in permafrost conditions to climate change and economic activity, is characterized as very unequal in scientific works published over the past 20-50 years. This circumstance dictates the need to study and estimate the response of the permafrost conditions of the active layer in Central Yakutia to climate warming and anthropogenic impact. The article presents the results of studies of the moisture characteristics of the thermokarst polygon, which was formed after the uprooting of a mixed birch-larch forest in 1965-1985 in areas of wedge ice distribution, an area of arable land unaffected by the thermokarst process, as well as an area of birch succession formed after deforestation and a larch-birch forest. The weight moisture content of soils in each of the four above types of landscapes was determined by sampling with a manual soil drill-sampler from individual soil horizons into aluminum bottles in the field and subsequent drying to constant weight and calculation at the cameral stage. A change in the moisture characteristics of soils depending on changes in permafrost and landscape conditions has been revealed. It has been established that in the area of the birch forest, the weight moisture content of the soil in the seasonally thawed layer at a depth of 0.3-1 m is higher than in the larch-birch forest, due to the high density of crowns and the shallow depth of the seasonally thawed layer of the first. In the area of arable land where thermal subsidence occurred, the soil moisture content in the vertical horizon of 0.3-1.0 m is much higher than in the arable land unaffected by the thermokarst process, which is due to additional moistening conditions due to snowfall, as well as its accumulation and retention on thermal subsidence.

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