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Abstract— <p>To create a digital soil twin, we should define and formalize as many indicators as possible that characterize soil functioning in the landscape and various soil degradation and progradation processes. The aim of this study is to identify the influence of soil properties—the contents of clay, silt, and sand fractions; organic carbon (C<sub>org</sub>); and carbon of carbonates (C<sub>carb</sub>)—on the morphometric parameters (MPs) of aggregates in the plow and subplow layers of uneroded and severely eroded typical chernozems of Kursk oblast. A&#xa0;significant positive correlation with the minimum diameter of aggregates has been found for C<sub>carb</sub> of severely eroded chernozems and C<sub>org</sub> of noneroded Chernozems. Within all size classes of aggregates, the effect of the contents of C<sub>org</sub> and C<sub>carb</sub> and various particle-size fractions, as well as the degree of erosion (on the binary scale noneroded/severely eroded) on MPs has not been found.. At the same time, neither the above-mentioned soil factors nor the size class of the aggregate affect the elongation and orientation of the aggregates, while the form factor and the unevenness of the boundary of soil aggregates decrease and increase accordingly with increasing size of the aggregates. Our study, which is innovative in many aspects, shows that the factor of water erosion has a significant impact on the physical and chemical properties of the upper horizons of plowed chernozems. However, a detailed analysis of the MPs of soil aggregates indicates that in the presence of such a strong factor as regular tillage, the factor of water erosion manifests itself only at a depth of 20–30 cm, where the influence of the anthropogenic factor weakens, and the influence of natural soil properties is stronger. At the same time, the results obtained indicate the resilience of most of the MPs of aggregates in chernozems to water erosion, if it is accompanied by annual soil tillage. It is shown that the unevenness of the boundary of aggregates largely depends on their size than on the degree of soil erosion. Presumably, the processes of water erosion and tillage practices indirectly affect this morphometric parameter via regulating the composition of the size fractions of soil aggregates.</p>

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Micromorphometric Parameters of Aggregates of Uneroded and Severely Eroded Arable Chernozems: A Case Study in Kursk Oblast

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • O. O. Plotnikova,
  • D. S. Komkova,
  • I. V. Danilin,
  • N. P. Masyutenko,
  • A. V. Kuznetsov,
  • M. N. Masyutenko

摘要

Abstract—

To create a digital soil twin, we should define and formalize as many indicators as possible that characterize soil functioning in the landscape and various soil degradation and progradation processes. The aim of this study is to identify the influence of soil properties—the contents of clay, silt, and sand fractions; organic carbon (Corg); and carbon of carbonates (Ccarb)—on the morphometric parameters (MPs) of aggregates in the plow and subplow layers of uneroded and severely eroded typical chernozems of Kursk oblast. A significant positive correlation with the minimum diameter of aggregates has been found for Ccarb of severely eroded chernozems and Corg of noneroded Chernozems. Within all size classes of aggregates, the effect of the contents of Corg and Ccarb and various particle-size fractions, as well as the degree of erosion (on the binary scale noneroded/severely eroded) on MPs has not been found.. At the same time, neither the above-mentioned soil factors nor the size class of the aggregate affect the elongation and orientation of the aggregates, while the form factor and the unevenness of the boundary of soil aggregates decrease and increase accordingly with increasing size of the aggregates. Our study, which is innovative in many aspects, shows that the factor of water erosion has a significant impact on the physical and chemical properties of the upper horizons of plowed chernozems. However, a detailed analysis of the MPs of soil aggregates indicates that in the presence of such a strong factor as regular tillage, the factor of water erosion manifests itself only at a depth of 20–30 cm, where the influence of the anthropogenic factor weakens, and the influence of natural soil properties is stronger. At the same time, the results obtained indicate the resilience of most of the MPs of aggregates in chernozems to water erosion, if it is accompanied by annual soil tillage. It is shown that the unevenness of the boundary of aggregates largely depends on their size than on the degree of soil erosion. Presumably, the processes of water erosion and tillage practices indirectly affect this morphometric parameter via regulating the composition of the size fractions of soil aggregates.