Home – Home – Jornals – Contemporary Problems of Ecology 2002 number 3

Data on microbial transformation of carbon in some regions of Middle and East Siberia (Krasnoyarsk Krai), Central Evenkia, Lower and middle reaches of the Angara, and the West Sayan are presented. It has been established that the total productivity of bacteria and fungi of the upper humus horizon of the soils of biogeocenoses studied amounts to 1.4-4.0 mg/cm3 (1.2-3.8 t/ha in the 0-50 cm layer), or 0.3-1.5 % of the amount of humus. The calculated carbon of the microbial biomass of the soils studied varies from 0.65 to 2.0 mg/cm³ (0.7-1.3 t/ha in the 0-50 cm layer) or 0.4-1.7 % of the total carbon. At the average microbial biomass level in the soils under study of 2.5 t/ha (0.025 g/cm³), the amount of energy reaches 1375 kcal/m². The annual amount of carbon dioxide supplied to the atmosphere from the forest soils of the regions under study due to the microbiota activity varies from 4.8 to 5.5 t/hs. In the litters of pine, cedar and deciduous forests during the vegetation season up to 0.8-2.2 t/ha (40-53 %) of vegetable remnants is decomposed, which amounts to 0.3-1.1 t/ha (40-70 %) in terms of cellulose.