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Cryolithozone biogeocenosis are characterized by low biological turnover capacity, mosaic of soil and vegetation cover, poor species composition of phytocenoses and their low bioproductivity. Samples of clean and oil-contaminated oligotrophic peat of undisturbed structure (monoliths) were taken on hilly peatlands of the northern taiga of Western Siberia, developing in permafrost conditions. Peat was maintained throughout the experiment at natural humidity, for which the monoliths were regularly weighed (once every three days) and, if necessary, sprayed with water. The thawing periods (temperature + 7°C) and freezing (-10°C) lasted 14 days, the duration of the experiment was 4 months. To assess the effect of pollution on the composition of organic matter and the change in the microbial community, the following parameters were determined: the content and composition of labile humic substances (Сlhs) (labile humic (Clha) and fulvic acids (Сlfa), total carbon content (Ctot), water-extractable carbon content (Cw), basal respiration (BR), microbial biomass carbon (MB), petroleum content in samples (OilP). Results are shown in Table 1.

The influence of old oil pollution on the composition of organic matter and the microbiological activity of peat soils in the permafrost zone