TY - JOUR T1 - Evaluation of Parametric Pedotransfer Functions for Estimating Soil Water Characteristic Curve in Fars Province TT - ارزیابی توابع انتقالی پارامتریک برای تخمین منحنی مشخصه آب خاک در استان فارس JF - JSTNAR JO - JSTNAR VL - 15 IS - 58 UR - http://jstnar.iut.ac.ir/article-1-2056-en.html Y1 - 2012 SP - 25 EP - 37 KW - Soil water characteristic curve KW - Parametric pedotransfer functions KW - Brooks and Corey moel KW - Campbell model KW - van Genuchten model N2 - Soil water characteristic curve shows the relationship between soil water content and matric suction, which has an important role in water movement in the soil. The measurement of this curve is expensive and time-consuming in laboratory therefore, many methods have been proposed for its estimation including pedotransfer functions. By using the pedotransfer functions, soil water characteristic curve can be estimated based on other easily measured soil physicochemical properties. Parametric pedotransfer functions have been offered for parameters of the existing soil water characteristic curve models. In this study, 12 internal and external parametric pedotransfer functions of Brooks and Corey, Campbell and van Genuchten models were used and evaluated for 30 top soil samples in Fars province. To this end, the soil water characteristic curve and other necessary soil properties were measured, and then all soils according to the texture were divided into three groups of fine, medium and course textures. The results showed that the parametric pedotransfer functions of van Genuchten model were better than the other models, beacause of the better fit of this model to the measured data. Also, the results demonstrated that the parametric pedotransfer functions of Wosten et al. were the most appropriate method for estimating the soil water characteristic curve for the selected soils in Fars province, and that internal pedotransfer functions were not appropriate M3 ER -