2025 Ecosystem Transformation 8 (2), 137-155

Response of phytocenoses of the Sorokaozerki Area (Koibalskaya Steppe, Minusinsk Basin) to interannual changes in precipitation against the background of post-pasture demutation

Zlotnikova T.V.  , Leonova T.V., Zhukova E.Yu.

Three model phytocenoses undergoing post-pasture demutation (ecological restoration) were observed from 2018 to 2023 on the restricted area of a coal mining enterprise (in order of decreasing soil moisture content): forb-cinquefoil-bluegrass meadow steppe (FC-1), caragana forb-onion-cinquefoilcereal meadow steppe (FC-2), and caragana forb-feather-grass meadow steppe (FC-3). In 2019, the amount of precipitation was higher than the long-term average, while year 2022 was extremely dry. During the restoration succession, the proportion of species in phytocenoses and the total projective cover of the shrub and grass layers changed gradually. With this, the response of phytocenoses to pronounced interannual variations in the amount of precipitation was observed – fluctuations in the height of the grass (by 1.5–2 times) and aboveground phytomass (by 2.7–3.9 times). In the extremely dry year of 2022, a decrease or stagnation of the total projective cover of the grass layer was observed. The graphical model of polynomial regression showed that the grass stand height of FC-1 was directly associated with the amount of precipitation, with the relationship being close to linear. The grass stand height of FC-2 and FC-3, as well as the aboveground phytomass of all three model phytocenoses, changed curvilinearly with an increase in the amount of precipitation. Interpolation showed that the phytomass reaches its maximum values with a precipitation amount for April-August of 350–370 mm (for FC-1), 300-350 mm (for FC-2 and FC-3). With a greater amount of precipitation, the phytomass of FC-2 and FC-3 showed a tendency to decrease.

T. V. Zlotnikova
Khakassian State University named after N.F. Katanov
prospekt Lenina 90, Abakan, 655017 Russia

tamara.zlotnikova@mail.ru

T. V. Leonova
Khakassian State University named after N.F. Katanov
prospekt Lenina 90, Abakan, 655017 Russia


E. Yu. Zhukova
Khakassian State University named after N.F. Katanov
prospekt Lenina 90, Abakan, 655017 Russia

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