Vital structure of cenopopulations of Potentilla alba L. (Rosaceae) at the Southern Opillia

It is presented results of individuals vitality research and the vital structure of Potentilla alba L. (Rosaceae) cenopopulations at the Opillia. It is investigated 15 cenopopulations according to Yu. A. Zlobin. It is established that the vital status of individuals and the vital structure of P. alba cenopopulations vary depending on the ecological-cenotic conditions. In most cenopopulations, there are individuals of all classes of vitality, but in the correlation between classes there are significant differences. Cenopopulations belong to three vital types, however, prosperous types prevail. The predominance of vitality highest class individuals and high values of the quality index are characteristic for cenopopulations that grow at the mesophytic and steppe meadows and meadow steppes, at podzolic chernozems with a capacity 45-60 cm, formed at the slabs or sloping parts of the slopes – in formations groups of Brizietа mediae and Brachypodietа pinnati. Equilibrium cenopopulations with superiority of vitality higher or middle-class individuals are presented at the meadow steppes formed at relatively steep slopes – in formations groups of Caricetа humilis and Seslerietа heufleranae, as well as associations of Brachypodietum (pinnati) festucosum (valesiacae). Depressive type with minimum values of the quality index and advantage vitality lower class individuals includes the cenopopulation in the formation groups of Elytrigietа intermediae, which are characterized by a high density of dominant species and the plentiful flora composition. The same indicators are typical for the cenopopulation in association groups of Festucetum (valesiacae) stiposum (pennatae), which grows at a steep slope of a hill with shallow black soil and scattered gipsoandardites.