WATER REGIME AND GENESIS OF PSEUDOFIBROUS AND GLEY SOILS OF GLACIOFLUVIAL PLAINS (POLESE LANDSCAPES)

The depth and dynamics of the goundwater table throughout the warm sea son are crucial factors in soil formation on coarse-textured deposits in glaciofluvial plains. Also, in spring, an impermeable layer of froz en soil has a substantial effect on the pedogenesis and is responsible for soil waterlogging and the occurrence of perched water above the f rozen horizon of soils of automorphic (geochemically independent) and superaquatic landscapes, Such soil conditions favor the development of gleyification, which is realized under conditions of a stagnant and p ercolative water regime. Pseudofibers occurring in nongley, deeply gle y and gleyic soils largely control the wetness of enclosing horizons a nd plant water supply because of an increased water-holding capacity a nd poor permeability of pseudofibrous neoformations.