S. O. Glinska*, S. S. Shtokalo, D. V. Lyko, Ya. V. Stepaniuk and L. K. Savchuk

Anthropogenic influence on the natural vegetation of Volyn Polissya threatens the existence of habitats of rare and endangered species of flora. Therefore, the region, unique in botanical and geographical terms, is gradually losing its specific vegetation characteristics. Having analyzed the literature data, herbarium data and materials of our own field studies in 2016-2019, we have compiled a list of rare and endangered species of pine-oak stands. In the habitat of pine-oak stands 89 rare species were found, 29 of which are listed in the Red Data Book of Ukraine, while Silene lithuanica is included in the European Red List. 3 species (Cypripedium calceolus, Trapa natans Ñ�а Caldesia parnassifolia) are included into appendices of “The Convention on International Trade in Endangered Species of Wild Fauna and Flora”. 10 species are subject to protection according to the appendix of “Convention on the Conservation of European Wildlife and Natural Habitats” 56 species are regionally rare species for the flora of the Volyn region, 4 species are rare species of pine-oak stands. In our research we have analyzed the age range, density and recovery index for the species studied. The study found that for 63 rare species the dynamics of species abundance and distribution are satisfactory. The area of distribution and the number of 7 species is increasing: Allium ursinum, Galanthus nivalis, Platanthera chlorantha, Anemone sylvestris, Campanula persicifolia, Corydalis cava, Isopyrum thalictroides In the study area 14 species grow sporadically: Juniperus communis, Potentilla alba, Digitalis grandiflora, Gymnocarpium dryoptheris, Daphne mezereum, Neottia nidus-avis, Epipactis helleborine, Scorzonera purpurea, Asparagus officinalis, Iris sibirica, Adonis vernalis, Cephalanthera damasonium, Gentiana cruciate, Gentiana pneumonanthe. Dissemination information for Caldesia parnassifolia, Succisella inflexa, Genistella sagittalis, Salix myrtilloides, Ophioglossum vulgatum is insufficient for establishing species dynamics and needs further investigation. The conservation of pine-oak stands in Volyn Polissya will help to create the conditions for the growth of rare and endangered species of flora.

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