Site CALM R-40 located in the forest-tundra zone is represented by three main landscape types characteristic of this region. The analysis of the spatial differentiation of the seasonally thawed layer showed strong dependence of the seasonally thawed layer on the vegetation: tundra landscapes are characterized by a thinner seasonally thawed layer, as compared with the forest landscapes. This is associated with the presence of moss and peat horizons. Slight reduction of the seasonally thawed layer is observed during the monitoring period between 2008 and 2011. Nonetheless, this assessment is not very reliable due to a short monitoring series. The strongly expressed dependence of the seasonally thawed layer on the thawing degree-days is observed in both landscapes. In this case, the curve inclination testifies to a more expressed response of the tundra landscape to climatic changes of the summer period.
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