The Impact of Multiple Freeze-Thaw Cycles on the Microstructure of Aggregates from a Soddy-Podzolic Soil: A Microtomographic Analysis

被引：36

作者：

Skvortsova, E. B. ^{[1
]}

Shein, E. V. ^{[1
,2
]}

Abrosimov, K. N. ^{[1
]}

Romanenko, K. A. ^{[1
]}

Yudina, A. V. ^{[1
]}

Klyueva, V. V. ^{[1
]}

Khaidapova, D. D. ^{[2
]}

Rogov, V. V. ^{[2
]}

机构：

[1] Dokuchaev Soil Sci Inst, Per Pyzhevskii 7, Moscow 119017, Russia

[2] Lomonosov Moscow State Univ, Moscow 119991, Russia

来源：

EURASIAN SOIL SCIENCE | 2018年 / 51卷 / 02期

基金：

俄罗斯基础研究基金会;

关键词：

capillary moistening of soil; X-ray microtomography; micromorphometry; aggregate pore space; TOMOGRAPHY;

D O I：

10.1134/S1064229318020102

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

With the help of computed X-ray microtomography with a resolution of 2.75 mu m, 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 mu m 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.

引用

页码：190 / 198

页数：9

共 26 条

[1]

[Anonymous], PROBLEMS SOIL CRYOGE

[2]

[Anonymous], MANUAL MICROMORPHOLO

[3]

Ershov E. D., 1988, MICROSTRUCTURE PERMA

[4]

Gubin S. V., 1993, Pochvovedenie, V10, P62

[5] Evaluation of temperature and freeze-thaw effects on excess pore pressure generation of fine-grained soils [J].

Hazirbaba, Kenan ;

Zhang, Yu ;

Hulsey, J. Leroy .

SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 2011, 31 (03) :372-384

[6]

Hugh A.L., 2007, SOIL BIOL BIOCHEM, V39, P977, DOI [DOI 10.1016/J.SOILBIO.2006.11.017, 10.1016/j.soilbio.2006.11.017]

[7]

IUSS Working Group WRB, 2015, 106 IUSS WORK GORUP

[8]

KONISHCHEV V N, 1977, Pochvovedenie, P119

[9]

Konishchev V. N., 1966, GEOLOGY CENOZOIC N E, P167

[10]

Kosheleva I. T., 1958, IZV AN SSSR GEOL, P25

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