Stocks of organic carbon and nitrogen in dark serozems of the Chirchik river basin in Tashkent region of Uzbekistan

The reserves of SOC and TN were investigated in the profile of dark serozems of the river basinChirchik, Tashkent region of Uzbekistan, in connection with the exposure of slopes and use in agriculture. The highest stocks of SOC and TN (79.2 and 10.3 t/ha) are noted in the 1-meter layer of natural soil on the northern slope that is more abundant in moisture, relatively low temperature and thicker vegetation cover. And in a meter layer of a similar soil on the southern slope, the SOC and TN reserves were significantly lower and amounted to 75.5 and 9.7 t/ha. The use of these soils in agriculture led to significant losses of SOC and TN in the meter layer and in the soil profile as a whole. In the soil of the northern slope of agricultural use, the SOC and TN reserves were 76.7 t/ha and 10.3 t/ha, which is significantly lower compared to natural soil. Also, in the soil of agricultural use on the southern slope, the value of SOC and TN reserves in the meter layer of soil was 68 and 9 t/ha that is significantly lower than that in the natural soil of the slope developed in the same exposure. Thus, slope exposure and agricultural land use were the main factors affecting SOC and TN stocks in the profile of the studied soils.

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