Analysis of the flora the valley-terrace landscapes of the Ukrainian steppe zone

The article presents a comprehensive characterization of the flora the valley-terrace landscapes of the Ukrainian steppe zone based on the results of systematic, geographical, biological and ecomorphic analyses. It has been established that the flora of valley-terrace landscapes is represented by 1315 species of vascular plants belonging to 508 genera, 120 families, 6 classes and 5 divisions. The spectrum of the leading families of valley-terrace landscapes of the steppe zone of Ukraine basically coincides with a similar spectrum leading families of vascular plants of southeastern Ukraine, the flora of the Right Bank steppe and of the Dniester-Tiligul interfluve. The only difference is in the Cyperaceae family, which ranks fifth in the spectrum of leading families, while in the above floras this family is on the 9th–10th places. The flora is dominated by hemicryptophytes among climamorphs, perennials among biomorphs, heliophytes among heliomorphs, mesotrophs among trophomorphs, mesophytes among hygromorphs, and pratants among cenomorphs. According to the cenomorphic analysis of the flora, it was found that 30.2% (397 species) have a ruderal component (found in ruderal, semi-natural habitats). The adventitious flora is represented by 223 species of vascular plants (16.96%), including 6 invasive species. From the flora of valley-terrace landscapes of the Ukrainian steppe zone, 8 species of vascular plants are included in the World Red List (WRL), and 14 species are included in the European Red List. The Red Data Book of Ukraine in different categories: (1) – 1 species, (2) – 25 species, (3) – 9 species, (4) – 7 species. The Red List of Dnipropetrovska oblast includes 42 species of the studied flora. The analysis of species occurrence categories revealed that 88 species are very rare, 495 species are rare, 286 species are sporadic, 368 species are frequent, and 78 species are very frequent. The analysis of landscape transformation according to the hemerobia system shows that mesohemorrhizal species predominate in the flora, which indicates an average level of transformation of valley-terrace landscapes of the Ukrainian steppe zone.