Investigation of the Formation of Productive Moisture Reserves in the Thickness of Chernozem under the Forest-Steppe Conditions

Abstract

In this research paper analysis of the dynamics of the moisture content of the soil layer of chernozem and the accumulation of productive moisture reserves in its thickness was carried out, based on a set of data from 1947 to 2022. The change in the moisture regime within the periodically leaching water regime of the central part of the Left Bank Forest-Steppe of Ukraine has been analyzed. The analysis was performed under the crops: winter wheat, spring barley, corn for grain and silage, sugar beet, sunflower in crop rotations of various types to a depth of 0 – 100 cm to 0 – 300 cm. The purpose of the research was to establish the features of the formation of reserves of productive moisture in the chernozem thickness in a seasonal dimension upon the dynamics of climatic parameters against the background of their intra-century climatic variability for the conditions of the left bank part of the central Forest-Steppe of Ukraine. Based on the conducted research, the following results were obtained. In order to form a non-flushing humidification regime, it is necessary to accumulate 117 – 135 mm in the thickness of 0 – 100 cm, which will correspond to a reserve in the thickness of 0 – 200 cm – 117 – 167 mm. For periodic flushing water regime 160 – 165 mm of moisture should be accumulated in the 0 – 100 cm thickness, which will provide a moisture reserve of 300 mm in the 0 – 200 cm thickness. The flushing water regime is formed with a moisture reserve in the thickness of 0 – 100 cm in the amount of 175 mm, which provides a moisture reserve in the thicknesses of 0–150 cm and 0–200 cm – 250 mm and 315 mm, which corresponds to the reserve of NV-VRK, and the thickness of 0 –300 cm is saturated with moisture in an amount of more than 400 mm (HB-VK). There is manifested the process of the self-regulation stability of the Forest-Steppe zone against active aridization and the “attack” of the Steppe on the Forest-Steppe.

Keywords

• factor analysis
• correlation
• climate
• volatility
• productive moisture reserve
• precipitation of the cold period
• moisture index (indiator)
• left bank forest-steppe