ИСТИНА

Biomass and biomass structure of microorganisms (prokaryots and fungi) was studied in anthropogenically modified and intact soils of the Rybachy Peninsula (in the north of Murmansk Region). Microorganisms unique to dry-peat soils were studied for the first time. The lowest fungal biomass (0.102 mg/g of soil) was found in a sample from a cryogenic hill without vegetation, and the highest (0.668 mg/g of soil) – in the dry-peat horizon. Fungal mycelium length was the shortest – 14 and 29 m/g of soil – in cryogenic soil samples, and the greatest – 413 m/g of soil – in a dry-peat sample. The number of fungi spores and yeast was low – about 2-4×10 5 cells/g of soil. The majority of the spores and yeasts were no larger than 3 microns in diameter. The lowest prokaryot biomass (4.59×10 -4 mg/g of soil) was found in an anthropogenically modified soil sample, and the highest (2.98×10 -3 mg/g of the soil) – in the drypeat horizon. Actinomyces mycelium length in the samples varied between 1 and 102 m/g of soil. The number of prokaryot cells was 2-9×10 7 cells/g of soil, i.e. two orders of magnitude larger than the number of fungal spores. Thus, the quantitative indices of soil microorganisms on the Rybachy Peninsula vary significantly.