Features of soil microbiomes restoration of forest phytocenoses after fires in the steppe and forest-steppe zones of Central Siberia

   Studies were conducted in forest phytocenoses of the steppe zone of the Shirinsky district (Khakassia Republic) and the forest-steppe zone of the Pogorelsky pine forest (Krasnoyarsk region) damaged by fire. Using microbiological indicators (quantitative and qualitative composition of microorganisms, microbial biomass content, microbial respiration, enzymatic activity), the rate of restoration of biological activity of soils in artificial plantings of forest plantations of Scots pine, Siberian larch, Siberian elm and in a pine forest of a natural forest was assessed. It was found that after fires, the biological activity of the studied soils is restored faster in postfire sites (not completely burnt tree stand) than in burnt areas (completely burnt tree stand) due to the large amount of pyrogenic carbon (Cpyr) and pyrolysis/pyrogenesis products and significant combustion of the soil cover. It is noted that for different types of the studied soils (agrozems and dark gray), an adequate assessment of their condition is provided by universal indicators (total number of microorganisms, content and specific respiration of microbial biomass, enzymatic activity), which reflect the biological activity of soils and indicate the direction of restoration processes. In agrozems under forest plantations of the Shirinskaya steppe, specific indicators were dominant bacteria of the order Actinomycetales and fungi of the genera Mortierella Coem and Penicillium Link. In the dark gray soil of the pine forest of the Pogorelsky pine forest after the fire, non-spore bacteria (Serratia plymuthica) dominated, spore bacilli (Bacillus mycoides) were sodominants, as well as fungi of the genera Trichoderma Pers. and Umbelopsis Amos & H.L. Barnett.

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