Abstract
The organic carbon content in developed soddy-podzolic soils increased during the overgrowing of abandoned plowland with meadow and forest vegetation. The highest carbon content was recorded at the stage of 40–50-year-old forest, which was related to the largest input of organic matter into the soil and the intense litter decomposition during this period. A decrease in the soil carbon content was observed during the development of forest vegetation on the long-term hayfields in place of the former croplands, because the humus content in the lower part of the old-arable horizon decreased significantly. The spatial variability in the distribution of organic carbon in the soils increased with the development of forest biogeocenoses.
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