Abstract
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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References
- 1.
A. F. Vadyunina and Z. A. Korchagina, Methods for Studying Soil Physical Properties (Agropromizdat, Moscow, 1986) [in Russian].
- 2.
K. M. Gerke, R. K. Saidl, and S. B. Turuntaev, “Influence of preferential flow paths on the vertical migration of moisture in the aeration zone: experimental study,” Geoekologiya, No. 5, 422–432 (2010).
- 3.
K. M. Gerke, E. B. Skvortsova, and D. V. Korost, “Tomographic method of studying soil pore space: current perspectives and results for some Russian soils,” Eurasian Soil Sci. 45 (7), 700–709 (2012).
- 4.
G. V. Dobrovolsky and S. A. Shoba, Scanning Electron Microscopy of Soils (Moscow State University, 1978) [in Russian].
- 5.
S. Panina and E. V. Shein, “Mathematical models of soil moisture transfer: Importance of experimental assurance and upper boundary conditions,” Moscow Univ. Soil Sci. Bull. 69 (3), 133–138 (2014).
- 6.
M. N. Pol’skii, “Study of porosity and microstructure of soil aggregates in polished thin sections,” Pochvovedenie, No. 4, 351–356 (1952).
- 7.
E. B. Skvortsova, “Changes in the geometric structure of pores and aggregates as indicators of the structural degradation of cultivated soils,” Eurasian Soil Sci. 42 (11), 1254–1262 (2009).
- 8.
E. B. Skvortsova, “Micromorphometry of pore space in soil and diagnostics of soil structure,” Pochvovedenie, No. 11, 42–49 (1994).
- 9.
E. B. Skvortsova, K. M. Gerke, D. V. Korost, and K. N. Abrosimov, “Structure of pore space in podzolic horizons of the loamy soils (analysis of 2D and 3D images),” Byull. Pochv. Inst. im. V.V. Dokuchaeva, No. 71, 65–79 (2013).
- 10.
E. B. Skvortsova and D. R. Morozov, “Micromorphometric classification and diagnostics of structure of soil pore space,” Pochvovedenie, No. 6, 49–56 (1993).
- 11.
Theories and Methods of Soil Physics, Ed. by E. V. Shein and L. O. Karpachevskii (Grif i K, Tula, 2007) [in Russian].
- 12.
E. V. Shein, Lectures on Soil Physics (Moscow State University, Moscow, 2005) [in Russian].
- 13.
E. Beckers, E. Plougonven, C. Roisin, S. Hapca, A. Léonard, and A. Degré, “X-ray microtomography: a porosity-based thresholding method to improve soil pore network characterization?” Geoderma 5, 219–220 (2014).
- 14.
R. Brewer, “Classification of plasmic fabrics of soil materials,” in Soil Micromorphology, Ed. by A. Jongerius (Elsevier, Amsterdam, 1964).
- 15.
R. Brewer, Fabric and Mineral Analysis of Soils (Wiley, New York, 1964).
- 16.
Y. Capowiez, S. Sammartino, and E. Michel, “Using X-ray tomography to quantify earthworm bioturbation non-destructively in repacked soil cores,” Geoderma 162, 124–131 (2011).
- 17.
G. N. Hounsfield, “Computerized transverse axial scanning (tomography). Description to system,” Br. J. Radiol. 46, 1016–1022 (1973).
- 18.
L. Luo, H. Lin, and P. Halleck, “Quantifying soil structure and preferential flow in intact soil using X-ray computed tomography,” Am. Soil Sci. Soc. J. 72, 1058–1069 (2008).
- 19.
W. Oh and B. Lindquist, “Image thresholding by indicator kriging,” IEEE Trans. Pattern Anal. Mach. Intell. 21, 590–602 (1999).
- 20.
H. Rogasik, J. W. Crawford, O. Wendroth, I. M. Young, M. Joschko, and K. Ritz, “Discrimination of soil phases by dual energy X-ray tomography,” Soil Sci. Soc. J. 63, 741–751 (1999).
- 21.
S. Schlüter, U. Weller, and H. J. Vogel, “Segmentation of X-ray microtomography images of soil using gradient masks,” Comput. Geosci. 36, 1246–1251 (2010).
- 22.
M. Th. van Genuchten, “A closed form equation for predicting the hydraulic conductivity of unsaturated soils,” Soil Sci. Soc. Am. J. 44, 892–898 (1980).
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Original Russian Text © E.V. Shein, E.B. Skvortsova, A.V. Dembovetskii, K.N. Abrosimov, L.I. Il’in, N.A. Shnyrev, 2016, published in Pochvovedenie, 2016, No. 3, pp. 344–354.
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Shein, E.V., Skvortsova, E.B., Dembovetskii, A.V. et al. Pore-size distribution in loamy soils: A comparison between microtomographic and capillarimetric determination methods. Eurasian Soil Sc. 49, 315–325 (2016). https://doi.org/10.1134/S1064229316030091
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Keywords
- water retention curve
- soil pore space
- microtomography
- capillarimetry
- morphometry of pore space