Features of seasonal temperature variations in peat soils of oligotrophic bogs in south taiga of Western Siberia

5th International field symposium "West Siberian Peatlands and Carbon Cycle: Past and Present" and the International conference "Carbon Balance of Western Siberian Mires in the Context of Climate Change"

Kiselev, M.V.^1 ; Dyukarev, E.A.^1 ; Voropay, N.N.^1,2

Inst. of Monitoring of Climat. and Ecol. System of the Siberian Branch Russian Academy of Sciences, Akademicheskii 10/3, Tomsk, Russia^1

V B Sochava Institute of Geography of the Siberian Branch Russian Academy of Sciences, St. Ulan-Bator, Irkutsk, Russia^2

关键词: Degradation rate;    Frozen layer;    Minimum temperatures;    Seasonal temperature variations;    Soil temperature regimes;    Surface temperatures;    Temperature regimes;    Western siberia;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/138/1/012006/pdf
DOI  :  10.1088/1755-1315/138/1/012006

来源: IOP

【 摘 要 】

The work presents the results of the study of the peculiarities of the temperature regime in the five basic ecosystems of oligotrophic bogs in the south taiga zone of Western Siberia in 2011-2016. The soil temperature regime was studied using the atmospheric-soil measuring complex at different depths from surface down to 240 cm. All sites were divided into two groups according to the bog water level: flooded sites (hollow and open fen) and drained sites (ridge, tall and low ryam). The waterlogged sites are better warmed in the summer period and slowly freeze in the winter period. The analysis of the annual cycle of temperature showed that the maximum surface temperature is in July. The minimum temperature on the surface is observed in February or January. The greatest temperature gradient was recorded in the upper 2 cm layer. The gradient at the open fen was-2 °C/cm in February and 1.1 °C/cm in October. The peak of formation of the seasonally frozen layer occurs at the end of autumn or in the beginning of winter. The degradation of the seasonally frozen layer was observed both from top and bottom, but the degradation rate from the top is faster.