Influence of a complex of indicators on the rate and extent of the soil formation process in soils of the Kashkadarya river basin in Uzbekistan

Studying the rate of soil formation is important for assessing soil fertility, predicting changes in soil cover, and developing soil resource management methods. This article presents a study examining the rate of soil formation in areas with varying bioclimatic conditions and soil cover in the Kashkadarya River basin, Uzbekistan. The study subjects were virgin soils in a vertical zonation from desert to high-mountain zones: gray-brown desert soil, takyr soil, typical gray soil, mountain brown soil, and light-brown meadow-steppe high-mountain soil. Due to the diversity of parent materials, changing bioclimatic and altitudinal zones, and the process of subsurface weathering, fluctuations in the content of initial parameters-crystalline lattice energy, amorphous iron, and kaolinite-were observed in the soils, leading to changes in the rate of soil formation. The sequence of increasing rates of soil formation in the studied soils is as follows: takyr soil – typical serozem – light brown meadow-steppe soil – mountain brown soil – gray-brown desert soil. In-depth study of soil-forming processes in biocenoses is necessary for developing strategies for increasing soil fertility and optimizing land use.

1. Li J., Chen H., Zhang C. Impacts of climate change on key soil ecosystem services and interactions in Central Asia // Ecological Indicators. – 2020. – Vol. 116. – P. 106490.

2. - DOI: https://doi.org/10.1016/j.ecolind.2020.106490.

3. Rosenzweig C., Hillel D. Soils and global climate change: Challenges and opportunities. Soil science, – 2000. – Vol. 165, № 1. – P. 47-56. - DOI: 10.1097/00010694-200001000-00007.

4. Gelybó G., Tóth E., Farkas C., Horel Á., Kása I., Bakacsi Z. Potential impacts of climate change on soil properties // Agrokémia és Talajtan. – 2018. – Vol. 67, № 1.

5. – P. 121-141. - DOI: 10.1556/0088.2018.67.1.9.

6. Liu Y.et al. Dynamic Monitoring of Ecological Environmental Quality in Arid and Semi-Arid Regions: Disparities Among Central Asian Countries and Analysis of Key Driving Factors // Remote Sensing. – 2025. – Т. 17. – № 11. – P. 1825. - DOI: https://doi.org/10.3390/rs17111825.

7. Karabaev N.A., Mamatkanov S.A., Bekbolotov Zh.A., Ma S. Vozdejstvie antropogennogo faktora i globalnogo izmeneniya klimata na plodorodie serozemov Kyr-gyzstana // Vestnik Kyrgyzskogo nacionalnogo agrarnogo universiteta im. KI Skryabina.

8. – 2014. - № 3. – S. 49-53.

9. Volokitin, M.P. Izmeneniya v processah pochvoobrazovaniya pri globalnom izmenenii klimata // Evrazijskij soyuz uchenyh. – 2019. – №10-2 (67).

10. Ergina E.I., Artemova E.A. Klimaticheskie i paleoklimaticheskie faktory pochvoobrazovaniya na territorii Krymskogo poluostrova // Izvestiya vysshih uchebnyh zavedenij. Severo-Kavkazskij region. Estestvennye nauki. – 2024. – № 3 (223). – S. 54-62.

11. Makarov O.A., Demidov V.V., Abdulhanova D.R., Kubarev E. N. Osobennosti funkcionirovaniya i razvitiya pochv // Agrohimicheskij vestnik. – 2025. – №. 4. – S. 88-98.

12. Dokuchaev V.V. Mesto i rol sovremennogo pochvoobrazovaniya v nauke i zhizni. Izbrannye sochinenie. T.III. – Moskva: Selhozgiz,1949. – 335 s.

13. Chub V.E. Izmenenie klimata i ego vliyanie na prirodno-resursnyj potencial Respubliki Uzbekistan. Tashkent: SANIGMI, 2000. – 252 s.

14. Chub V.E. Izmenenie klimata i ego vliyanie na gidrometeorologicheskie processy, agroklimaticheskie i vodnye resursy Respubliki Uzbekistan. – Tashkent: NIGMI, 2007. – 132 s.

15. Climate change. The Physical Science Basis [Electronic resource] / Intergo-vernmental Panel on Climate Change (IPCC). – 2021. – URL: https://www.ipcc.ch/report /ar6/wg1/downloads/report/IPCC_AR6_WG1_SPM_Russian.pdf.

16. Spektorman T.Yu. Dinamika pokazatelej zasushlivosti territorii Uzbekistana v svyazi s izmeneniem klimata // Ocenka izmeneniya klimata po territorii Respubliki Uzbekistan, razvitie metodicheskih polozhenij ocenki uyazvimosti prirodnoj sredy. Byulleten № 5. – Tashkent: SANIGMI, 2002. – S. 57-64.

17. IUSS Working Group WRB. World Reference Base for Soil Resources. International soil classification system for naming soils and creating legends for soil maps. World Soil Resources Reports. - № 106. FAO, Rome, 2014 (update 2015). – 181 р.

18. Genusov A.Z., Gorbunov B.V., Kimberg N.V. Klassifikaciya i diagnostika pochv Uzbekistana // V kn.: Genezis, geografiya i melioraciya pochv Uzbekistana. Tashkent, 1972. – S. 3–49.

19. Metody agrohimicheskih, agrofizicheskih i mikrobiologicheskih issledovanij v polevyh hlopkovyh rajonah. – Tashkent: SoyuzNIHI, 1963. – 440 s.

20. Tyurin I.V. Organicheskoe veshestvo pochv i ego rol v pochvoobrazovanii i plodorodii: uchenie o pochvennom gumuse. – M: Selhozgiz, 1937. – 289 s.

21. Shajmuhamedov M.Sh., Voronina K.A. Metodika frakcionirovaniya organo-glinnyh kompleksov pochv s pomoshyu laboratornyh centrifug. // Pochvovedenie. –1972. – № 8. – S. 134–138.

22. Volobuev V.R. Opyt rascheta energii kristallicheskoj reshetki pochvennyh mineralov // Pochvovedenie. – 1968. – № 4. – S. 89–93.

23. Arinushkina E.V. Rukovodstvo po himicheskomu analizu pochv. – M: MGU, 1970. – 487 s.

24. Mehra O.P., Jackson M.L. Iron oxide removal from soils and clays by a dithionite-citrate system buered with bicarbonate // Proc. 7th Nat. (U.S.) Conf. Clays and Clay Miner. – London: Pergamon Press, 1960. – P. 317–327 - DOI: http://dx.doi.org/10.1346/CCMN. 1958.0070122.

25. Gorbunov N.I. Mineralogiya i fizicheskaya himiya pochv. – M: Nauka, 1978.

26. –292 s.

27. Rozanov B.G. Morfologiya pochv. – M: MGU, 1983. – 320 s.

28. Akhatov A., Nurmatova V., Usmonova B. The Influence of Slope Exposure, Profile Depth and Erosion Processes on Changes in the Content of Potassium, Phosphorus, and Humus in Brown Soils of Mountain Pastures of Uzbekistan // Yuzuncu Yil University Journal of Agricultural Sciences. – 2024. – Vol. 34, № 2. – P. 224-234. - DOI: https://doi.org/10.29133/yyutbd.1393784.

29. Lobova E.V. Pochvy pustynnoj zony SSSR. – M: Nauka, 1960. – 364 s.