Aggregate Structure of Native and Arable Soils of Different Geneses: Morphological and Rheological Characteristics

Autor: M. V. Khmeleva, M. M. Suslenkova, M. A. Butylkina, A. B. Umarova, A. I. Gasina, M. S. Aleksandrova, Z. S. Ejelev, A. K. Shkhapatsev
Rok vydání: 2021
Předmět:
Zdroj: Eurasian Soil Science. 54:1299-1311
ISSN: 1556-195X
1064-2293
DOI: 10.1134/s1064229321090131
Popis: Aggregates and capillary-saturated pastes from loamy soddy-podzolic soils (Albic Glossic Retisol (Lomic, Cutanic)), typical and vertic chernozems (Haplic Chernozems (Loamic, Aric, Pachic) and Vertisols), and yellow soils (Alisols) were studied by scanning electron microscopy (SEM) and on a Reotest-2 rotary viscometer with a coaxial cylindrical system. Aggregates of plow horizons of Retisols and Chernozems have less pronounced porosity and denser packing of their microaggregates in comparison with native soils. Microaggregation of the plow layer of Vertisols is observed at high magnifications, while in the humus horizon of the fallowed Vertisol, the section of the aggregate has a massive structure. The study of the rheological behavior of the soils revealed the predominance of condensation-crystallization structural bonds in the plow layers, whereas coagulation structures prevailed in the deeper horizons. However, in the upper horizons of Vertisols, coagulation structure is well developed and thixotropy occurs. The limit of a plastic-viscous breakdown of the structure is higher in soils that are not involved in agricultural use, and the Shvedov limit corresponding to the beginning of deformation processes, on the contrary, is lower. All studied soil samples had several strength limits, which indicates the hierarchical organization of the structure of soil aggregates.
Databáze: OpenAIRE
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