Fraction-group humus composition of cryogenic surface-gley and hydromorphic soils of the Bol’shezemel’skaya tundra
The article aims to study the fraction-group humus composition in cryogenic surface-gley and hydromorphic soils of the Bol’shezemel’skaya tundra. The specifics of the studied soils formed on loam are proved to be of high carbon content in coarse-humus (mor) organic-accumulative horizons and its content is inclined to a sharp decrease with depth. Humus composition is humuc-fulvic in organic horizons and fulvic in mineral horizons. Cryo-surface-gley soils are highly soluble and characterized by the low-average humification degree of organic matter. The humus profile of cryo-hydromorphic soils is formed by a complex of processes such as cryogenic mass exchange, frost retinization, and cryogenic denaturation and coagulation of disperse humus systems.
tundra soils, humus, fraction-group composition, cryogenesis
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