Abstract <p>The dynamics of vegetation and soil properties formed during the primary succession (for about 30&#xa0;years) in the middle taiga subzone of the European Northeast of Russia is studied. By the end of the third decade, the grass-to-forest community replacement in the posttechnogenic territory is practically finished, and a dense tree layer and grass cover dominated by forest and forest-edge species are formed. The forest ecosystem is formed by differentiation of groups of tree plants (parcels) with the litter formation: leaf–needle litter in pine parcel and leaf–grass litter in birch parcel. The grass-to-forest community replacement is accompanied by a transition from humus-impregnated humus pelozems to humus-impregnated eluviated pelozems. At the tree stand development stage, soil morphological structure and chemical properties are determined by the parcel structure of forest community. Variations in the content of Corg and biogenic elements in litter and organic–mineral soil horizon are caused by the different composition of plant communities in parcels and, consequently, different mineralization rates of plant residues. By the end of the third 10-year period of succession, the upper 0–20 cm soil layer accumulates organic carbon to 24.5 t/ha in pine parcel and to 28.7 t/ha in birch parcel.</p>