BIO Web Conf.
Volume 16, 2019“Results and Prospects of Geobotanical Research in Siberia”, dedicated to the 75th anniversary of the laboratory of ecology and geobotany of CSBG SB RAS
|Number of page(s)||5|
|Published online||15 October 2019|
The ontogeny and the demographic structure of the coenopopulations of the species Oxytropis chakassiensis (Fabacaea) in the steppe communities of Khakhassia (Russian Federation)
Central Siberian Botanical Garden SB RAS Zolotodolinskaya Str., 101,
2 State Reserve "Khakassky", Tsukanova Str., 164, Abakan, Russia
The article presents the results of the analysis of the demographic structure of ten coenotic populations of Oxytropis chakassiensis in near-Yenissei steppes (Khakassia and Krasnoyarsk krai). Most part of studied species coenopopulations are not complete and definitive, normal, mature, have a bimodal developmental spectrum with peaks at g1 (v)- and g3-individuals. Changes in the structure of the ontogenetic spectrum (increasing the share of young plants) depend mainly on the environmental conditions and the degree of human disturbance of habitats: rocky slopes and decrease in pasture digression create more favorable conditions for the survival of juveniles. The ontogeny of O. chakassiensis (the rare species of near-Yenissei steppes) was studied and its life- form was described. Four periods and nine ontogenic stages were distinguished. The results of our study showed that O. chakassiensisis was a petrophyte steppe species with strict ecological and cenotic propensity to petrophytic steppe with the prevalence Koeleria cristata, Festuca valesiaca, Arctogeron gramineum, Hedysarum turczaninovii, Alyssum obovatum and Thymus minussinensis. Due to long generative period O. chakassiensis is successfully renewed and is stable during long periods of extreme conditions of petrophytic steppes with high pasture digression.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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