Байкал, снежный покров, стабильные изотопы кислорода и водорода. Baikal, snow cover, stable isotopes of oxygen and hydrogen. Стабильные изотопы водорода и кислорода-природные трассеры гидрологического цикла, которые используются в исследованиях гидрологических процессов и для нахождения источника влаги. В статье приводятся данные по снежному покрову Трансбайкальского региона от г. Якутск до озера Байкал. Улан-Удэ был выбран в качестве ключевого участка для более детального изучения снежного покрова. Показано, что в зимний период значения δ 18 O снега в г. Улан-Удэ достигают −39‰, что типично для внутриконтинентальных воздушных масс-результатов меридионального и западного переноса. Цель статьи-описать пространственную изменчивость содержания стабильных изотопов водорода и кислорода в снежном покрове. Deuterium and oxygen-18 are standard water tracers which are widely used to investigate hydrological processes and to trace the moisture sources. In this study, we collected bulk samples taken from the snow cover in the Baikal region distributed from the city Yakutsk to the Lake Baikal. Ulan-Ude had been chosen as a key site to study the snow cover in more details. It has been shown that during the winter season δ 18 O values in Ulan-Ude reach −39‰ that is typical for the inland air masses of meridional or western transport. The aim of this study was to describe the spatial variability of concentrations of the isotopes deuterium (2 H) and oxygen-18 (18 O) in the snow cover.

The subject of this study is the ratio of carbon and nitrogen content in the soil of the lithalsa landscape in the Sentsa River valley. The focus is on the spatial distribution of C/N ratio in the genetic soil horizons: humus (A), illuvial (B), the parent rock(C), as well as in the buried peat horizon (T). The carbon and nitrogen content is analyzed in 70 samples using the element analyzer C, H, N, S –O EA 1110. Sample preparation included drying the soil through a sieve and grinding it with a rubber pestle in a porcelain mortar. It is found that cryogenic concentration of soil solutions, cryogenic heaving, thermokarst, zoogenic turbations, peat burial, and alluvial loam deposition are the main processes determining the peculiarity of soil formation within lithalsa landscapes. The maximum variation in the ratio of carbon and nitrogen content is observed in the illuvial horizon, while in the humus horizon and in the parent rock, as well as in the buried peat horizon, this indicator is of a smaller range.

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