Abstract
Goal. To assess ecological efficiency of the scheme of formation of agrolandscapes at the level: system of gullen drainage areas → gullen drainage areas of the Aidar river. Methods. Laboratory-field, mathematical-statistical, topometric, morphological. Results. The basic erosion-ecological situation of the object of research is determined. PS levels are calculated for the Steppe zone. An Integral map of soil erosion hazard classes of the Steppes of Ukraine is constructed. At the level of the system of gullen drainage areas of the Aidar River, the analysis is carried out of the nature of the impact of forecast and actual erosion-hydrological indicators (runoff costs) on the development of erosion-hydrological processes on a probabilistic basis (1; 5; 10; 50%) by their ratio. On the example of the Yevsuh and Kovsuh river basins, plowing indicators are calculated for key drainage areas along the river with differentiation of administrative land use. The map of the structure of the Yevsug and Kovsug river basins within the drainage areas is constructed. The structure of sown areas and their plowing is assessed according to the potential runoff indicator: up to 5 mm — insignificant, 5.1–8 — weak, 8.1–15 mm — moderate, with erosion index levels (3 and lower; 3–4; 4–5; 5 and above) and grouping the structure of sown areas. According to the simplex method, the analysis of actual and forecast erosion-hydrological indicators and optimization of the structure of sown areas is carried out. For the Aidar River basin the model structure of crop rotations is obtained. Ecological assessment of the structure of crop rotations is performed according to the coefficient of ecological danger of crop rotations. Conclusions. At the level of the gullen drainage areas system, the coefficient of the ratio of KV of forecast and actual losses of the river runoff as an indicator of the development of erosion-hydrological processes on a probabilistic basis (1; 5; 10; 50%) at hydro-posts along the Aidar River showed that at 10% security in case of reduction of plowed lands to 50–60%, a high level of runoff reduction (81–90%) was observed at the Bakhmutivka hydro-post, medium (73–85%) — at Bilolutsk and Starobilsk hydro-posts, the lowest — at the Kuriachivka hydro-post (39–65%). The study of humus content in the range of 4.5–5.5% by groups of arable land areas 40–60% revealed constant decrease in Qmax (average maximum runoff losses) in the range of 8–9%. At the level of individual gullen drainage areas, the determination of the basic erosion-ecological situation of the object of research on the integrated map of erosion hazard classes of steppe soils of Ukraine showed its belonging to the class of moderate erosion hazard with runoff of 8.1–15.0 mm.
Highlights
The main goal of creating a unified system for managing water resources in the basin is to optimize water use and increase the number of used water resources in the basin by applying a unified basin approach that combines territorial and administrative interests
The essence of the ecosystem-basin approach to water resources management is to shift the focus from the water bodies themselves to the entire basin and to systems of girder catchments and individual girder reservoirs in agricultural landscapes in order to fully cover all possible causes of environmental violations, intersectoral and inter-territorial contradictions and to prevent and eliminate negative phenomena [1,2,3,4,5,6,7]
The water strategy for minimizing erosion processes in agricultural landscapes is based on research conducted in the Aidar river basin [13, 14], it was used for soil and water management of agricultural landscapes at a new information level [15, 16]
Summary
The main goal of creating a unified system for managing water resources in the basin is to optimize water use and increase the number of used water resources in the basin by applying a unified basin approach that combines territorial and administrative interests. The water strategy for minimizing erosion processes in agricultural landscapes is based on research conducted in the Aidar river basin [13, 14], it was used for soil and water management of agricultural landscapes at a new information level [15, 16]. The goal is to assess the environmental efficiency of the agro-landscape formation scheme at the level of: system of girder catchments → girder reservoirs R. Subject - ecological efficiency of the scheme of formation of agroland-shaftiv at the level of: system of beam catchments → beam reservoirs of Aidar. Research problem. 1) Determination of ecological efficiency of application of schemes of formation of agricultural landscapes on catchments
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