DEMOGRAPHIC STRUCTURE AND VITALITY OF COENOPOPULATIONS OF THE RARE SPECIES HEDYSARUM SANGILENSE IN THE CONDITIONS OF THE SANGILEN HIGHLANDS
Inessa Yu. Selyutina1, Elena S. Konichenko1, Evgeny G. Zibzeev1, Natalia V. Igay1
Central Siberian Botanical Garden, Siberian Branch RAS, Novosibirsk, Russia
Keywords: coenopopulation, Hedysarum sangilense, ontogenetic structure, rare species, subendemic, seed productivity, vitality
Abstract
The article presents the results of the analysis of the demographic structure of the coenotic populations of Hedysarum sangilense Krasnob. et Timoch. on the high-altitude Sangilen plateau (South-Eastern Tuva). The ecological-coenotic association, ontogenesis, ontogenetic and vital structure of 7 populations of this subendemic species were studied. It is established that in the studied territory the species is confined to the communities with Kobresia and dryad tundras within the alpine belt and to the shrubby thickets in the forest belt. Study of the demographic structure revealed that the majority of coenotic populations are characterized by left-sided age spectra with a predominance of juvenile, virginal and, most often, young generative plants. In conditions of disturbed phytocenoses (recovering from fires), left-sided spectra are formed with a maximum on generative young plants. Among the vitality of the types of populations of H. sangilense is dominated by depressive and equilibrium types. Sufficiently high real seed productivity and a long generative period ensure the self-maintenance of H. sangilense populations in the conditions of high-altitude plant communities of the Sangilen highlands.
|
