Biotic homogenization of dendroflora in the conditions of the megapolis (Dnipro, Ukraine)

Purpose. Biodiversity assessment and clarification of the trend towards homogenization dendroflora Shevchenko Park (Dnipro, Ukraine). Methods. Floristic methods research are applied - elucidation taxonomic composition selection adventitious fraction dendroflora, species richness (according to Menkhinik index Margalef index), determination floristic commonality Jaccard index) homogeneity Koch biotic dispersion), ecological analysis (by biomorphs ecomorphs), physical, physicochemical, chemical soil analysis, biological activity, statistical data processing (descriptive statistics correlation analysis). Results. It was established that artificial stands trees in capable forming a sufficient amount viable undergrowth autochthonous introduced (adventurous) species, ratio which is 37.0% 63.0%. The tree growth adventive sites areas according level recreational load distributed as follows: with no 38.5% number self-regenerating trees, moderate 68.2%, strong 80.5%. indexes for site turned out be largest (due species) compared load. dispersion 50.0%. Correlation coefficients between allochthonous have self-regenerated studied strong, statistically significant (0.73, 0.76, 0.77 respectively). Conclusions. On territory investigated park, there 14 seed self-regeneration, taxonomically belong 12 genera 10 families. Of them, 9 were registered, represented by 7 families leading family Sapindaceae. calculated testifies presence process forest stand on park. As part an increased invasion Ailanthus altissima occurrence such neophyte Celtis occidentalis Acer negundo, indicates penetration alien into local flora potential threat natural diversity.