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bibliography: Borovyk, L.2019. The role of alien species in abandoned field successions in the Starobilski steppes. Geo&Bio. Vol. 17: 26–38. (In Ukrainian) doi: https://doi.org/10.15407/gb.2019.17.026 authors (with orcid and affiliation): L. Borovyk Luhansk Nature Reserve of NAS of Ukraine pdf: pdf summary: The role of alien species in ecosystems is constantly increasing; their influence on various successional processes is expanding, including the processes of steppe restoration on abandoned arable lands. Under modern con-ditions, research on new dynamic trends in vegetation cover associated with the distribution of alien species is of great importance. The study area is located in the steppe zone on the north of Luhansk Oblast, Ukraine in the basin of the northern tributaries of the Siverskyi Donets River, on the Derkul-Komyshna and Komyshna-Kalytva interfluves. Stationary observations were conducted in the Striltsivkyi Steppe department of the Luhansk Natural Reserve of NAS of Ukraine. Geobotanical releves of the abandoned field sites and the results of transect surveys served as a basic material for analysis. In total, 76 alien plant species of 68 genera belonging to 26 families were recorded on abandoned fields. Among them, 50 % of species form abundant populations, most of which are common for the early stages of succession. Sixty-six alien species were recorded on recently abandoned fields, 45 species on middle-age ones, and 34 species on old aban-doned fields. Alien species are among the main dominants on the young weedy abandoned fields, along with segetal species and ruderal species having wide habitat amplitudes. Many ruderal species are presented on the old abandoned fields, but their coenotic role is declining. Yet the number of alien species decreases in the course of succession, it remains sufficient on the old abandoned lands, which can be explained by the insufficient grazing impact and, consequently, slow steppe recovery processes. We obtained data on the alien woody species, which in recent decades have encroached on the abandoned fields from the artificial planta-tions. Eleven species were found, five of them belong to species-transformers with Ulmus pumila being the most aggressive. During about ten years, if there is no grazing and/or mowing, the overgrowth of the alien woody species results in succession blockage due to formation of tree and shrub thickets impeding recovery of steppe communities on the former arable lands. Management of the abandoned lands prospective for the recovery of steppe communities should include preventive measures to stop the spread of alien woody species. The best treatment is a combination of grazing and mowing. 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