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bibliography: Ivanov, E. А., I. P. Kovalchuk. 2021. Patterns of formation and functioning of geosystems of Stebnyk tailings dam. Geo&Bio, 20: 58–69. (In Ukrainian) title: Patterns of formation and functioning of geosystems of Stebnyk tailings dam Закономірності формування та функціонування геосистем Стебницького хвостосховища doi: http://doi.org/10.15407/gb2008 authors (with orcid and affiliation): Eugen Ivanov, Ivan Franko National University of Lviv (Lviv, Ukraine) Ivan Kovalchuk, Ivan Franko National University of Lviv (Lviv, Ukraine) pdf: gb2008-ivanov.pdf summary: The specifics of the landscape structure within the first section of the Stebnyk tailings dam are considered. Two landscape terrains (of natural and anthropogenic genesis), 3 separate landscape belts, 8 types of landscape tracts, and 30 types of landscape sub-tracts have been identified. Geosystems are dominated by flat sloping surfaces of the tailings dam, the external embanked of which forms closed drainless areas requiring systematic regulation of the level of the final reservoir. Features of filling the tailings surfaces played an important relief-forming role. At the same time, there were raised areas (0.5‒2.5 m) confined to the southern and south-western parts of it. Actually, conditions for the formation of tree-bush and meadow-marsh vegetation of different stages of succession were created in these areas. Spatial-temporal regularities of the occurrence and development of plant communities within the first section of the Stebnyk tailings dam were determined based on the decryption of space images for 2006‒2018. Primary meadow-marsh, bush-meadow, and tree-bush communities on surfaces with different levels of salinization were distinguished. In fact, these communities form the primary succession series in the formation of vegetation cover of post-mining geosystems. To decipher the boundaries of plant communities, 16 space images were obtained from the publicly available Google Earth Pro program. The tendencies of changes in the number and area of the plots occupied by different plant groups have been determined. Currently, the area of tree-bush communities is 5.59 hectares (7.87 % of the total area). Bush-meadow and meadow-marsh communities recorded an intensive increase in areas by 2014, followed by a rapid decrease caused by salinization of areas due to significant elevations of the reservoir’s level. In 2014, maximum areas of plant communities (37.55 ha) were identified, covering more than half of the study area (52.84 %), and in 2018 they occupied 21.71 ha (30.55 %). The gradual differentiation of phytocoenoses by moisture gradients and soil salinization continues. To maintain the rate of overgrowth of the first section of the Stebnyk tailings dam, it is necessary to reduce the level of brines regularly. Key words: geosystem, tailings dam, functioning, plant communities. Correspondence to: E. А. Ivanov; Ivan Franko National University of Lviv; 41 Doroshenko St, Lviv, 79000 Україна; e-mail: eugen_ivanov@email.ua, orcid: 0000-0001-6847-872X References (DOI = 2) Barinova, S. 2017. Ecological Mapping in Application to Aquatic Ecosystems BioIndication: Problems and Methods. Environ. Sci. Nat. Res., 3 (2): 555–608. https://doi.org/10.19080/IJESNR.2017.03.555608 Bilonizhka P., V. Diakiv, 2009. Chemical and mineralogical composition of waste of potash ore of Stebnyk deposit and their impact on the environment. Bulletin of Lviv University. Geological series, 23: 162–174. (In Ukrainian) Danilova, O. A. 2007. Modern landscape structure of mining areas (on the example of Alexandria brown coal district). Scientific notes of Vinnytsia M. Kotsyubynsky State Pedagogical University. Series: Geography, 13: 45–54. (In Ukrainian) Ivanov, E. 2001. Methods of ecological and landscape mapping of mining areas. Scientific Bulletin of Chernivtsi University, 104: 207–213. (In Ukrainian) Ivanov, E. A., Yu. M. Andreychuk, N. I. Lobanskaya. 2005. Problems of geoinformation modeling of mining geosystems. Physical Geography and Geomorphology, 48: 180–186. (In Ukrainian) Ivanov, E. 2007. Landscapes of mining territories. PC Ivan Franko National University of Lviv, Lviv, 1–334. ISBN 978-966-613-514-1. (In Ukrainian) Ivanov, E. A., I. P. Kovalchuk. 2012. Anthropogenization of landscapes: approaches, diagnosis, modeling. Scientific Bulletin of Chernivtsi University, 612-613: 54–59. (In Ukrainian) Ivanov, E. A. 2017. Natural and economic systems of mining territories of the Western region of Ukraine: functioning, modeling, optimization: the dissertation abstract … Doctor of Geographical Sciences. PІ Korpan B. I., Kyiv: 1–40. 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Inżynieria ekologiczna, 1: 81–86. Rudko H. I., Ye. A. Ivanov, I. P. Kovalchuk. 2019. Mining geosystems in the Western region of Ukraine, Bukrek, Kyiv, Chernivtsi, 1: 1–464. ISBN 978-617-7663-42-2. (In Ukrainian) Rudko H. I., Ye. A. Ivanov, I. P. Kovalchuk. 2019. Mining geosystems in the Western region of Ukraine, Bukrek, Kyiv, Chernivtsi, 2: 1–376. ISBN 978-617-7663-42-2. (In Ukrainian) Sashchuk, L. Z. 2006. Peculiarities of vegetation formation on the territories of mining developments of the cities of Borislav and Stebnik]”. Problems of ecology and ecological education: materials of the V International conference. Publishing house, Kryvyi Rih: 118–120. (In Ukrainian) Tsar, H., V. Dyakiv. 2011. Geochemical preconditions of calcium sulfate mineral formation in systems of transportation of brine of potash deposits of Precarpathia. Bulletin of Lviv University. Geological series, 25: 189–196. (In Ukrainian) Yatsentiuk, Yu. V. 2013. 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