ZARAFSHON VODIYSI TUPROQLARINING GUMUS HOLATINI IQLIM O‘ZGARISHI SHAROITIDA UZOQ MUDDATLI SUG‘ORISH TA’SIRIDA O‘ZGARISHI

The paper summarises the results of a 25-year (1999–2024) monitoring of the transformation of soil organic matter (SOM) in the Zeravshan Valley against the background of regional warming (+0,40–0,45°C per decade). The novelty of the study lies in the fractionation of humus into agroecologically significant pools (labile, stable, and inert) to assess long-term dynamics. It was established that the climatic factor initiates a decline in gross organic carbon (Corg) stocks in the arable layer. At the same time, an adaptive mechanism was revealed: under irrigated conditions, soils undergo qualitative "maturation" of humus, expressed in humification (an increase in the Сha:Cfa ratio to 47%), an increase in the proportion of labile forms and stable complexes.

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