Purpose: to conduct a soil-ecological assessment with the calculation of the soil-ecological index (SEI) for the soils of two estuaries located in the Om River valley (Northern Baraba) and to study their structural-aggregate state using three parameters: structure coefficient; aggregate water stability criterion; water resistance.
Materials and methods. Soil samples were collected and subjected to laboratory testing using standard methods. The data were analyzed using statistical analysis methods using the Google Colab environment in the Python language with the SciPy library. Statistical processing of the analysis results was based on Spearman's correlation coefficient.
Results. It was revealed that the SEI values for the “Tai” estuary soils (Vengerovsky district, Novosibirsk region) are quite high, averaging 57.1 (with a minimum value of 27.6 and a maximum of 70.4). The average SEI values for the “Pushchikha” estuary (Kuibyshevsky District) were 20.2 (minimum 2.0, maximum 62.6). Such striking differences in the obtained soil-ecological index values for the estuary soils developed in the valley of the same river, under very similar environments, are explained by the fact that the soils of the studied estuaries are characterized by completely different degrees of phosphorus supply. In the case of the “Tai” estuary, the phosphorus content in the soils corresponds to medium and high supply (75–150 mg/kg). In the “Pushchikha” estuary soils, phosphorus content values vary in the range of 13.6–34.9 mg/kg, which corresponds to very low and low supply, which caused the sharply reduced values of the agrochemical indicator (necessary for calculating the SEI). This, in turn, was the main reason for the significant decrease in the final SEI values obtained for the soils of the “Pushchikha” estuary.
Conclusions. The structural-aggregate state of the soils of both estuaries is generally good for all three parameters examined. No relationship was found between the structural-aggregate state and SEI.
doi: 10.31774/2712-9357-2025-15-4-109-125
estuary irrigation, soil and vegetation cover, soil-ecological assessment, the Baraba Plain, structural-aggregate state, structure coefficient, aggregate water stability, aggregate water resistance, soil aggregate analysis
Bezborodova A. N., Filimonova D. A., Miller G. F., Chumbaev A. A. Soil-ecological assessment and study of the structural-aggregate state of the estuary irrigation areas of the Om River Valley in the southeastern Western Siberia. Land Reclamation and Hydraulic Engineering. 2025;15(4):109–125. (In Russ.). https://doi.org/10.31774/2712-9357-2025-15-4-109-125.
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Funding source: the work was carried out within the framework of the State Assignment of the Institute of Soil Science and Agrochemistry of the Siberian Branch of the Russian Academy of Sciences.
