The Impact of Multiple Freeze–Thaw Cycles on the Microstructure of Aggregates from a Soddy-Podzolic Soil: A Microtomographic Analysis
- Autores: Skvortsova E.1, Shein E.1,2, Abrosimov K.1, Romanenko K.1, Yudina A.1, Klyueva V.1, Khaidapova D.2, Rogov V.2
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Afiliações:
- Dokuchaev Soil Science Institute
- Lomonosov Moscow State University
- Edição: Volume 51, Nº 2 (2018)
- Páginas: 190-198
- Seção: Soil Physics
- URL: https://journals.rcsi.science/1064-2293/article/view/224412
- DOI: https://doi.org/10.1134/S1064229318020102
- ID: 224412
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Resumo
With the help of computed X-ray microtomography with a resolution of 2.75 μm, changes in the microstructure and pore space of aggregates of 3 mm in diameter from the virgin soddy-podzolic soil (Glossic Retisol (Loamic)) in the air-dry, capillary-moistened, and frozen states after five freeze–thaw cycles were studied in a laboratory experiment. The freezing of the samples was performed at their capillary moistening. It was shown that capillary moistening of initially air-dry samples from the humus (AY), eluvial (EL), and illuvial (BT1) horizons at room temperature resulted in the development of the platy, fine vesicular, and angular blocky microstructure, respectively. The total volume of tomographically visible pores >10 μm increased by 1.3, 2.2, and 3.4 times, respectively. After freeze–thaw cycles, frozen aggregates partly preserved the structural arrangement formed during the capillary moistening. At the same time, in the frozen aggregate from the AY horizon, the total tomographic porosity decreased to the initial level of the air-dry soil. In the frozen aggregate from the EL horizon, large vesicular pores were formed, owing to which the total pore volume retained its increased values. The resistance of aggregate shape to the action of freeze–thaw cycles differed. The aggregate from the EL horizon completely lost its original configuration by the end of the experiment. The aggregate from the AY horizon displayed definite features of sagging after five freeze–thaw cycles, whereas the aggregate from the BT1 horizon preserved its original configuration.
Sobre autores
E. Skvortsova
Dokuchaev Soil Science Institute
Autor responsável pela correspondência
Email: eskvora@mail.ru
Rússia, per. Pyzhevskii 7, Moscow, 119017
E. Shein
Dokuchaev Soil Science Institute; Lomonosov Moscow State University
Email: eskvora@mail.ru
Rússia, per. Pyzhevskii 7, Moscow, 119017; Leninskie gory, Moscow, 119991
K. Abrosimov
Dokuchaev Soil Science Institute
Email: eskvora@mail.ru
Rússia, per. Pyzhevskii 7, Moscow, 119017
K. Romanenko
Dokuchaev Soil Science Institute
Email: eskvora@mail.ru
Rússia, per. Pyzhevskii 7, Moscow, 119017
A. Yudina
Dokuchaev Soil Science Institute
Email: eskvora@mail.ru
Rússia, per. Pyzhevskii 7, Moscow, 119017
V. Klyueva
Dokuchaev Soil Science Institute
Email: eskvora@mail.ru
Rússia, per. Pyzhevskii 7, Moscow, 119017
D. Khaidapova
Lomonosov Moscow State University
Email: eskvora@mail.ru
Rússia, Leninskie gory, Moscow, 119991
V. Rogov
Lomonosov Moscow State University
Email: eskvora@mail.ru
Rússia, Leninskie gory, Moscow, 119991