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The particularities of vegetation post-agrogenic dynamics were studied for 4 chronological rows: overgrowing of arable land and overgrowing of hayfield in south taiga, overgrowing of arable land in deciduous forest subzone and overgrowing of arable land in forest-steppe subzone. Direction of successional dynamics of ecological structure and biodiversity depends on reclamation history as well as on bioclimatic factors and soils features. Most clear changes in the ratio of ecological groups (for herbs and under-shrub cover) are observed for overgrowing of arable land, formed on sandy soils in south taiga.