Pore-size distribution in loamy soils: A comparison between microtomographic and capillarimetric determination methods
- Autores: Dembovetskii A.1, Abrosimov K.2, Il’in L.3, Shnyrev N.1, Shein E.1, Skvortsova E.2
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Afiliações:
- Lomonosov Moscow State University
- Dokuchaev Soil Science Institute
- Vladimir Research Institute of Agriculture
- Edição: Volume 49, Nº 3 (2016)
- Páginas: 315-325
- Seção: Soil Physics
- URL: https://journals.rcsi.science/1064-2293/article/view/223771
- DOI: https://doi.org/10.1134/S1064229316030091
- ID: 223771
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Resumo
Pore-size distribution in a soddy-podzolic silt loamy soil developing from mantle loesslike loam (Eutric Albic Retisol (Loamic, Cutanic)) was calculated from the water retention curve according to Jurin’s equation and directly determined in microtomographic experiments. Rounded macropores with the diameter of their sections from 75 to 1000 μm predominate in horizontal sections if the studied soil samples. A larger part of the soil pores (>30–35%) belongs to micro- and nanopores, and they cannot be quantitatively determined by the tomographic method, because their sizes are smaller than the detection limit of the applied X-ray microtomography (8.75 μm per pixel). This leads to a significantly larger pore volume determined from the water retention curve in comparison with the “tomographic” pore volume. A comparative analysis of pore-size distribution curves obtained by these methods shows that the major regularities of the pore-size distribution in the range from 30 to 5000 μm are similar in both cases. Fine macropores and, partly, mesopores predominate. Common characteristics of the pore-size distribution curves obtained by these methods, including the coincidence of the peaks, attest to the validity of classical approaches, according to which the hydrology of soil pore space can be perceived as a physical model of cylindrical capillaries of different sizes with capillary-sorbed water.
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Sobre autores
A. Dembovetskii
Lomonosov Moscow State University
Email: evgeny.shein@gmail.com
Rússia, Leninskie gory, Moscow, 119991
K. Abrosimov
Dokuchaev Soil Science Institute
Email: evgeny.shein@gmail.com
Rússia, per. Pyzhevskii 7, Moscow, 119017
L. Il’in
Vladimir Research Institute of Agriculture
Email: evgeny.shein@gmail.com
Rússia, ul. Tsentral’naya 3, pos. Novyi, Suzdal district, Vladimir oblast
N. Shnyrev
Lomonosov Moscow State University
Email: evgeny.shein@gmail.com
Rússia, Leninskie gory, Moscow, 119991
E. Shein
Lomonosov Moscow State University
Autor responsável pela correspondência
Email: evgeny.shein@gmail.com
Rússia, Leninskie gory, Moscow, 119991
E. Skvortsova
Dokuchaev Soil Science Institute
Email: evgeny.shein@gmail.com
Rússia, per. Pyzhevskii 7, Moscow, 119017