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Estimation of Water Retention at Low Matric Suctions Using the Micromorphological Characteristics of Soil Pores

  • MINERALOGY AND MICROMORPHOLOGY OF SOILS
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Abstract

The objectives of this study were to characterize the soil pore area distribution (SPAD) and estimate the high energy soil-water characteristic curve (SWCC) using the two-dimensional (2D) image analysis method. Totally, 24 undisturbed soil samples taken from different horizons of six soil profiles (from surface to 1 m), were studied for micromorphological and physical characteristics including SWCC. The undisturbed samples were impregnated with a mixture of polyester resin plus fluorescent dye diluted with styrene. To determine the SPAD, the 2D images were analyzed using ImageJ software. The Laplace equation was also used to transform the estimated SPAD to SWCC using the mean equivalent diameter for each pore area class, and the estimated SWCC was compared to the SWCC which had been measured by a pressure plate/membrane apparatus. The results showed that, in matric suctions from 0 to 1000 cm of water column, the 2D image analysis method could determine the quantity of the pores which retain water. The macro-pores had almost circular shapes, while the finer pores exhibited more elliptical shapes and less circularity. The Feret diameter (R) and minimum Feret diameter (r) of the pores were significantly different from the Feret diameter of a circular cross-section. Therefore, the assumption of circularity of soil pores, which links SWCC to SPAD, could add uncertainty to the obtained results, particularly at high matric suctions resulting from thin pores. More accurate assessment and pore visibility techniques seemed to be necessary for better determination of the soil pores characteristics such as orientation, connectivity, and functioning and the differences in diameter, volume of the pores throughout the pores.

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The authors acknowledge the research affairs of the University of Tehran for their assistance in conducting this research.

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Bakhshi, A., Heidari, A., Mohammadi, M.H. et al. Estimation of Water Retention at Low Matric Suctions Using the Micromorphological Characteristics of Soil Pores. Eurasian Soil Sc. 56, 1751–1764 (2023). https://doi.org/10.1134/S1064229323600549

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