ONTOGENETIC STRUCTURE OF RARE PLANT SPECIES ON THE USTYURT PLATEAU OF UZBEKISTAN
The article is devoted to assessing the state of the ontogenetic structure of some rare species, such as Rosa laxa Retz., Crataegus korolkowii L. Henry, Artemisia terrae-albae Krasch. and Salsola arbusculiformis Drob., growing on the Karakalpak part of Ustyurt Plateau. The study showed that the studied cenopopulations are normal and mostly incomplete under the ecological and coenotic conditions of Ustyurt. The ontogenetic spectra of specific cenopopulations are left-sided and centered due to the environmental habitat conditions and weather fluctuations. The similarity of biological characteristics (long lifespan of individuals in a mid-age ontogenetic state, their lowest elimination and difficulty of seed germination) between the species individuals, and between ontogenetic and specific real spectra evidences that the studied cenopopulations of in the Karakalpak part of Ustyurt are stable.