Oleg Leonidovich Kuznetsov

The taxonomy of peat soils is not currently given more attention, especially with regard to taxonomic units in the species rank. The procedure of diagnostics of 51 soil profiles in the various oligotrophic mire types in the Numto nature Park (north taiga subzone of West Siberia) allows to make some proposals to improve the existing soil classification. These ones are: 1) to limit the peat horizon thickness in the peat-gleyzem type to 30 cm; 2) to divide the peat-gleyzem type by the trophic status into oligotropic and eutrophic subtypes; 3) to expand the list of taxa, determined by the botanical composition of peat, by means of the division of soil species into subspecies on the basis of classifications of peat and peat deposits; 4) to use current vegetation as one of the main diagnostic (indicative) criteria in determining the soil type in mires; 5) in order to determine the variety of peat soil it is suggested to use the degree of decomposition of the peat layer underlying the peat soil. The article draws attention to the difficulties in determining the classification position of soils of frozen large mounds in palsa bogs and proposes alternative solutions to this problem.