Clarification of consepts about soil water stability mechanism

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Abstract

The aggregate composition of soils and the water stability of aggregates are related to soil organic matter, its quantity and quality, but so far there is no satisfactory hypothesis explaining the mechanisms of this relationship. The purpose of the work is to verify the significance of the wedging water pressure influence on soil water stability and clarify ideas about the mechanism of this phenomenon. The assessment of soil water stability was carried out by the author's method of blades. The conducted verification showed that its correlation with the Savvinov wet sieving method carried out on 17 soil samples exceeds 85 %. During the experiments, it was found that when the units come into contact with water, their water stability decreases exponentially. The decrease in water stability in contact with water is usually explained by the wedging water pressure. Our experiments on replacing water with salt solutions during capillary humidification of aggregates did not confirm this theory. Therefore, using a scanning electron microscope, we tested the solution obtained after capillary contact of the aggregates with water. It was found that during capillary contact of aggregates with water, a labile part of humic substances is released there. Thus, the water stability of soil samples in contact with water is reduced due to the release of HS and a decrease in the number of structure-forming bonds in the aggregate.

About the authors

Dar’ya A. Ushkova

M.V. Lomonosov Moscow State University

Email: gennadiy.fedotov@gmail.com

student of the Faculty of Soil Science

Russian Federation, GSP-1, 1, p. 12, Leninskie Gory, 119991, Moscow

Ivan V. Gorepekin

M.V. Lomonosov Moscow State University

Email: decembrist96@yandex.ru

Researcher at the Eurasian Center for Food Security, Faculty of Soil Science

Russian Federation, GSP-1, 1, p. 12, Leninskie Gory, 119991, Moscow

Gennadiy N. Fedotov

M.V. Lomonosov Moscow State University

Author for correspondence.
Email: gennadiy.fedotov@gmail.com

Dr. Sci. (Biol.), Senior Researcher of the Faculty of Soil Science

Russian Federation, GSP-1, 1, p. 12, Leninskie Gory, 119991, Moscow

Yuriy P. Batyrev

BMSTU (Mytishchi branch)

Email: batyrev@mgul.ac.ru

Cand. Sci. (Tech.), Associate Professor

Russian Federation, 1, 1st Institutskaya st., 141005, Mytishchi, Moscow reg.

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