THERMAL REGIME OF PEAT DEPOSITS OF PALSAS AND HOLLOWS OF PEAT PLATEAUS IN WESTERN SIBERIA
N.G. Koronatova1, N.P. Mironycheva-Tokareva1, Ya.R. Solomin2
1 Institute of Soil Science and Agrochemistry, SB RAS, 8/2, Akad. Lavrent’eva ave., Novosibirsk, 630090, Russia; coronat@mail.ru
2 Yugra State University, 16, Chekhova str., Khanty-Mansiysk, Khanty-Mansiysk Autonomous okrug–Yugra, 628012, Russia
The study has been focused on the thermal regime of peat soils (fibrist histosols) of palsas and peat plateaus in northern West Siberia. Autonomous loggers recorded temperature for 343 days every hour to a depth up to 60 cm in palsas and 120 cm in hollows (collapse scars) in four mire ecosystems: the forest-tundra collapse scar and palsa, and the northern taiga collapse scar and palsa. The data on the mean diurnal temperature, the mean annual temperature, the extremes, the annual range, the active layer dynamics, the sums of positive and negative temperatures at different depths have been adduced. The established differences in the thermal regimes of soils were due to the differences in the ecosystems of mires, rather than in bioclimatic zones they belong to. The high-latitude mires have the largest impact on the annual range and temperature parameters obtained for the cold period.
Thermal regime of peat deposit, peat plateau, palsa, hollows (collapse scars), permafrost, Western Siberia