Status of cenopopulations of Astragalus austrosibiricus (Fabaceae) in the Altai mountains and Khakassia

The structure of cenopopulations of the herbaceous fodder plant Astragalus austrosibiricus Schischkin in different ecological and phytocenotic conditions of the Republic of Altai and Khakassia was studied. Studies were conducted on the state of the ontogenetic structure of the cenopopulations of the perennial taproot semi-rosette polycarpic Astragalus austrosibiricus, found on the degraded pastures and areas after a fire. Centered and bimodal types of age ontogenetic spectra of cenopopulations on undisturbed communities are revealed. Such features of the biology of the species as seed reproduction, rapid rates of development at the beginning and end of ontogenesis, the duration of the mature generative state, determine the ontogenetic structure of the cenopopulation of the species. In addition, the growing conditions (the presence of anthropogenic load, altitude above sea level and habitat moisture) also have the effect. Assessment of the state of cenopopulations of Astragalus austrosibiricus in the conditions of the Altai Mountains and Khakassia is based on the study of a complex of organismic and population traits. The values of the total points of organismal (17–21 points) and population (23–35 points) signs from cenopopulations with conditions most favorable for the habitat of this species are determined. On steppe pastures in the Altai Mountains with a high pasture load, the cenopopulations of Astragalus austrosibiricus are in a pessimal state. It is established that they are characterized by the lowest values of most of the parameters of the species, therefore, they gain from 5 to 13 aggregate points. A comprehensive assessment of the state of cenopopulations showed a significant variability in the morphological features of individuals and population parameters. Meadow cenopopulations 42 are in optimal condition in the undisturbed habitats of a Khakassia, where the maximum and average values of organismal and population traits are noted.

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