vitality

SOME ECOLOGICAL PECULIARITIES OF BULBOCODIUM VERSICOLOR (KER-GAWL.) SPRENG. (COLCHICACEAE, MAGNOLIOPHYTA) IN THE LOWER VOLGA REGION

Authors: Kulikova L. V., Kashin A. S., Petrova N. A., Shilova I. V.

The paper presents the results of our four-year observation of Bulbocodium versicolor (Ker-Gawl.) Spreng populations in the Saratov and Volgograd regions. A low ecological plasticity of the species was established. Although the species grows in steppe phytocenoses that vary in composition and structure, the specimens’ morphology was rather conservative, which can be explained by the homogeneity of the species’ vegetation conditions over the territory under study during active vegetation and flowering. It is shown that in the Lower Volga region, B.

ECOLOGICAL-PHYTOCENOTIC ASSESSMENT OF THE POPULATION STATUS OF THE RARE SPECIES DICTAMNUS GYMNOSTYLIS STEV. (RUTACEAE, MAGNOLIOPSIDA) IN THE SOUTHERN URALS

Authors: Abramova L. M., Mustafina A. N.

The results of our ecological-phytocenotic assessment of the natural coenopopulations of the rare (in Bashkortostan Republic) species Dictamnus gymnostylis Steven are given. In the Southern Urals, the species is on the northeastern border of its habitat. The ontogenetic, demographic and vitality structures of 20 coenopopulations were studied, the existence optima were found. The majority of the surveyed coenopopulations of D. gymnostylis have densities within 1 - 10 ind./sq.m and an incomplete ontogenetic spectrum, the basic ontogenetic spectrum being centered.