Analysis of ecofloristic diversity of the Poaceae family of forest biogeocenoses of the northern steppe Prydniprovya
Authors: Baranovsky B. O. , Zhikharеva A. V. , Gorban V. A. 
Published: December 2022

It is difficult to overestimate the importance of cereals in the functioning of natural ecosystems and their use for human life. They often play the role of dominants and edifiers in the composition of plant cover, primarily herbaceous types of vegetation. But they also take part in the composition of forest phytocenoses of different natural zones. Within Ukraine, the Poaceae family includes 71 genera (of which only 4 are in culture) and 208 species (of which only 15 are in culture) [20]. The cereal flora of forest biogeocenoses of the analyzed area was studied in the end of the 19th century [1]. Since the studied forest complexes are located within the steppe zone with various conditions of watershed-beam and valley-terrace landscapes, they contain species of various ecomorphs: from xerophytes to hygrophytes (or even helophytes); from heliophytes to sciophytes, from oligotrophs to megatrophs. The flora of forest biogeocenoses of the northern steppe Prydniprovya region includes 73 species of vascular plants. The greatest species richness belongs to the flora of floodplain forests, which confirms the statement about the extraordinary biodiversity of floodplain landscapes [35]. Of the entire flora of forest biogeocenoses, hemicryptophytes (42 species) predominate among climamorphs, heliophytes (66 species) predominate among heliomorphs, mesotrophs (39 species) among trophomorphs, and mesophytes (45 species) among hygromorphs. Among the coenomorphs, the majority are forest-meadow (55 species) and ruderal-forest (18 species). The Roaceae family of the forest biogeocenoses of the northern steppe Prydniprovya region includes 6 rare species that are included in the regional red list of rare plants [29]. The ecomorphic analysis of the flora confirms the peculiarities of the physical and geographical conditions of different types of forests. Among the climamorphs, hemicryptophytes predominate in birachous and wall forests. The majority of heliophytes are characteristic of arenaceous forests, and sciophytes are characteristic of floodplain forests. Among trophomorphs, megatrophs predominate in birachous and walled forests, oligotrophs in arena forests. The largest number of hygrophytes is characteristic of floodplain forests, and xerophytes is characteristic of arena forests. The forest biogeocenoses of the northern steppe Prydniprovya are characterized by significant anthropogenic transformation of the vegetation cover. In the composition of the forest flora, there are only 16 purely ruderal (weedy) species, and 23 ruderal species in mixed ecomorphs. Among them, 16 are adventive ruderal species. The assessment of anthropogenic transformation of the plant cover using the hemerobium method shows that the majority of the hemerobium species belong to mesohemerobes – species that grow on the territories of landscapes with a medium degree of transformation. This indicates a moderate transformation of the forest biogeocenoses of the northern steppe Prydniprovya. Among all types of forests, the least transformed are floodplain, ravine and wall forests.