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Evaluation of Pedotransfer Functions for Estimating Soil Water Retention Curve of Saline and Saline-Alkali Soils of Iran

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Pedosphere 2011年第2期21卷 230-237页

作者： Y.AbbASI b.ghanbarian-alavijeh A.M.LIAGHAT M.SHORAFA Department of Irrigation and Reclamation Engineering University of TehranKaraj 31587-77871 (Iran) Department of Earth and Environmental Sciences Wright State UniversityDayton OH 45435 (USA) Department of Soil Science Engineering University of TehranKaraj 31587-77871 (Iran)

Soil water retention data are essential for irrigation scheduling and determination of irrigation frequency. However, direct measurement of this characteristic is time consuming and expensive and furthermore its spatial and temporal variabilities in field scales increase the number of measurements. Different pedotransfer functions, such as Saxton et al., Campbell, Vereecken et al., l^awls and brakensiek, WSsten et al., Rajkni et al., Ghorbani Dashtaki and Homaee, Zacharias and Wessolek, and Rosetta, were evaluated to estimate soil water retention of saline and saline-alkali soils collected from south of Tehran, Iran. The saturation-extract conductivity of all the 68 samples and exchangeable sodium percentage of more than half of them were measured to be greater than 4 dS m-1 and 15%, respectively. The calculated Akaike＇s information criterion values showed that Saxton et al. and Campbell models were the best in estimation of soil water retention curve and total available water, respectively.

关键词： exchangeable sodium percentage irrigation frequency soil moisture curve total available water

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Estimation of the van Genuchten Soil Water Retention Properties from Soil Textural Data

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Pedosphere 2010年第4期20卷 456-465页

作者： b. ghanbarian-alavijeh A. LIAGHAT HUANG Guan-Hua M. Th. VAN GENUCHTEN Department of Irrigation and Reclamation Engineering University of Tehran Karaj 31587-77871 （Iran） Department of Earth and Environmental Sciences Wright State University Dayton OH 45435 （USA） Department of Irrigation and Drainage Engineering China Agricultural University Beijing 100083 （China） Department of Mechanical Engineering Federal University of Rio de Janeiro RJ 21945-970 （Brazil）

The van Genuchten (vG) function is often used to describe the soil water retention curve (SWRC) of unsaturated soils and fractured rock. The objective of this study was to develop a method to determine the vG model parameter m from the fractal dimension. We compared two approaches previously proposed by van Genuchten and Lenhard et al. for estimating m from the pore size distribution index of the brooks and Corey (bC) model. In both approaches we used a relationship between the pore size distribution index of the bC model and the fractal dimension of the SWRC. A dataset containing 75 samples from the UNSODA unsaturated soil hydraulic database was used to evaluate the two approaches. The statistical parameters showed that the approach by Lenhard et al. provided better estimates of the parameter m. Another dataset containing 72 samples from the literature was used to validate Lenhard's approach in which the SWRC fractal dimension was estimated from the clay content. The estimated SWRC of the second dataset was compared with those obtained with the Rosetta model using sand, silt, and clay contents. Root mean square error values of the proposed fractal approach and Rosetta were 0.081 and 0.136, respectively, indicating that the proposed fractal approach performed better than the Rosetta model.

关键词： fractal dimension soil water retention curve van Genuchten parameterization

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