Krivoruchko T. Rare steppe ephemeroides of Pridniprov'ya Left-bank (state of populations and scientific bases of guard).

This dissertation is devoted the studying of the populations state of rare steppe ephemeroides of Bulbocodium versicolor, Crocus reticulates, Hyacinthella leocophaea, Bellevalia sarmatica, Muscari neglectum at the boundary lines of Pridniprov'ya Left-bank. The history studying and guard of rare steppe ephemeroides of Pridniprov'ya Left-bank is analyzed. The known location on the territory of Ukraine is generalized and found out new at the boundary – lines of the probed region, ecological – cenotic features are set. The basic aspects of ontogenesis; the features of fenorhythms' passing of the in situ and et situ conditions was probed. The detailed of quantitative – population analysis enabled tu define the modern state of populations, seminal productivity. The consisting of populations' saving of rare steppe ephemeroides of the naturally protected network of Pridniprov'ya Left-bank is found out. The creation of three new nature protection objects of local value (Poltava region) and area expansion of existent botanical order ''Drabinivka" with a grant him of status national was grounded. The collection of rare steppe ephemeroides is created on the territory of the agronomical biological station park of Poltava pedagogical university on the agronomical biological station park of Poltava pedagogical university and on the experimental areas of the regional ecology – natural center of student's youth of Poltava.