Abstract <p>It remains relevant to assess the carbon cycle in ecosystems formed after clear-cutting at different stages of secondary succession. This study was conducted from 2018 to 2023 in a community formed after clear-cutting of a bilberry pine forest in 2008 using chainsaws and by removal of tree-length logs. It is shown that carbon from the 1-m thick soil layer is the dominant pool, the proportion of which was 78% of the total carbon pool in felling area and 95% on skid trails. The contribution of biomass and coarse wood debris (CWD) to the total carbon pool was higher in felling areas, which is determined by the presence of small-sized trees left after logging. Five-year observations have revealed an average carbon accumulation of 58 g/m² per year in the biomass of the tree layer and 5–7 g/m² per year in the undergrowth. Ground vegetation plants sequestered 72–101 g C/m² per year. No significant differences have been observed in the interannual dynamics of tree litterfall entering the soil surface; the litter structure is dominated by needles and leaves. A significant role in the process of carbon sequestration by phytocenosis and its flux to the soil surface together with litter is played by ground vegetation, the contribution of which varies in felling areas and on skid trails. The amount of carbon released with soil respiration in felling areas in May–October is 303–518 g /m², while its amount with soil respiration on skid trails is 419–608 g C/m². Analysis of carbon accumulation in biomass and carbon release into the atmosphere from soil respiration has shown that the bilberry pine forest ecosystem is a source of carbon 10–15 years after clear-cutting.</p>