CURRENT CONDITION OF COENOPOPULATIONS OF HEDYSARUM GRANDIFLORUM PALL. IN THE TERRITORY OF THE MIDDLE DON OF THE VOLGOGRAD REGION
N.A. Suprun1,2
1Volgograd Regional Botanical Garden, 68, Metallurgov ave., Volgograd, 400007, Russia
2Volgograd State Social & Pedagogical University, 27, V.I. Lenin ave., Volgograd, 400066, Russia
Keywords: Hedysarum grandiflorum, ontogenetic spectrum, coenopopulation, vitality, Middle Don, Volgograd region
Abstract
The paper presents data from a population-based study of a rare plant species Hedysarum grandiflorum Pall. in the Volgograd region on the basis of the study of 2012-2017 on the territory of the Cretaceous outcrops of the Middle Don. The habitat of the species was characterized, ontogenesis, age composition of coenopopulations, and abundance are determined. It has been established that different communities of coenopopulations of a given species are characterized by similar indices of abundance, density, and level of generativeness. Different levels of vitality of individuals in these coenopopulations are due to interspecific competition and the degree of anthropogenic load. Due to the peculiarities of the ontomorphogenesis and life strategy of H. grandiflorum, these factors lead to a decrease in the bank of seeds and seedlings. A low level of self-maintenance of cenopopulations and the death of individuals due to mechanical damage lead to the loss of a rare species from steppe phytocenoses.
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