AGE STRUCTURE OF RHAPONTICUM ALTAICUM (FISCH.EX SPRENG.) SOSKOV POPULATIONS. IN NORTHERN AND CENTRAL KAZAKHSTAN
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Authors
S.А Mamyryva
Al-Farabi Kazakh National University, Almaty, Kazakhstan
А.N. Kuprijanov
Kuzbass Botanical Garden – branch of Federal Research Center of Coal and Coal Chemistry, Kemerovo, Russian Federation
М.Yu. Ishmuratova
Karaganda Buketov University, Karaganda, Kazakhstan
S.А. Kubentayev
Astana Botanical Garden, Astana, Kazakhstan
Abstract
The article presents the results of studying the ontogenetic structure of seven cenopopulations of Rhaponticum altaicum in Karaganda and Akmola regions of Kazakhstan (Northern and Central Kazakhstan). Most of the analyzed cenopopulations are defined as normal with incomplete composition of age groups. The ontogenetic structure of cenopopulations includes two main types: 1) a centered two-vertex spectrum, in which the maximum number of individuals falls on the groups of virgin and middle-aged generative plants; 2) a left-sided spectrum with predominance of pre-generative individuals in the populations. The condition of cenopopulations was assessed using the "delta-omega" criterion of L. A. Zhivotovsky. According to this criterion, most of the cenopopulations are mature (CP 1-2, CP 4-5), only two (CP6 and CP7) are young. The presence of a significant number of young plants in CP6 indicates its high capacity for maintenance and self-restoration. In CP7, unfavorable conditions prevailed and potentially generative plants remained in virginal age state. CP3 occupies an intermediate position between mature and young populations. In all cenopopulations there was almost complete absence of senile and sub-senile individuals, and only in some of them - deposition of juvenile and immature individuals. Incompleteness of cenopopulations is associated with increasing anthropogenic load and narrow ecological amplitude of Rh. altaicum.
Keywords
Rhaponticum altaicum, Northern and Central Kazakhstan, ontogenetic spectrum, age periods and states, cenopopulations
Article Details
References
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