The impact of changes in climatic factors of the Aktumsuk region on the formations of Medicageta sativa

Abstract

The article presents a brief analysis of 20-year changes in climatic parameters of the Aktumsuk region of the Eastern Cliff of Ustyurt and their impact on the species composition of the Medicageta sativa formation. From the obtained analysis of the daily indicators of 2 sources (NASA POWER and the Aktumsuk meteorological station), long-term trends of changes in average, average maximum and average minimum air temperatures, as well as annual precipitation have been established. Data from 2000-2020 were taken for analysis. The warm and cold seasons of the year have been established, which affected the amplitude of the parameters. Basically, the decrease in minimum air temperature occurs in the cold half-year (November-December, January-March), which explains the increase in precipitation during these periods. The most significant warming in the territory of the Aktumsuk region was noted in warm seasons (April, June, July and August). The obtained data comparing the average annual air temperatures for the 2 above-mentioned sources of the 20-year period indicates that the climate of the Aktumsuk region is sharply continental, here we can observe sharp changes in the temperature regime in the direction of warming, which could lead to the transformation of the Medicageta sativa formation. The appearance of xerophytes in this type of vegetation in recent years provides information about the xerophytization of flora due to an increase in drought in the Eastern Cliff. Climate aridization, reduction in the number of mesophytes in the species composition, as well as their projective coverage, a sharp increase in xerophytes and halophytes in the species composition, communities may indicate significant changes in communities of this type of vegetation due to climate change.