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Functional Evaluation of Pedotransfer Functions Derived from Different Scales of Data Collection

^a USDA-ARS Hydrology and Remote Sensing Lab., 10300 Baltimore Ave. Bldg. 007 Rm. 124, BARC-WEST, Beltsville, MD 20705-2350, USA
^b USDA-ARS, George E. Brown Jr. Salinity Lab., 450 W. Big Springs Road, Riverside, CA 92507
^c ALTERRA Green World Res., P.O. Box 47, 6700 AA Wageningen, The Netherlands

View larger version (49K): [in a new window]   Fig. 1. Textural composition of the test data set (HUNTEST) and the Hungarian (HUN), European (EUR), and intercontinental (ICO) data sets of pedotransfer function development according to the USDA soil textural classification system (USDA, 1951). The number of samples (N) in each data set are in parentheses.

View larger version (59K): [in a new window]   Fig. 2. Estimation errors in terms of (a) root mean squared residuals (RMSRs) and (b) mean residuals (MRs) of each of the eleven models and five data sets used to develop pedotransfer functions. HUN, Hungarian data set; EUR, European data set; ICO, intercontinental data set. Input parameters of models M1, M2 ... M11 are listed in Table 2.

View larger version (51K): [in a new window]   Fig. 3. Root mean squared residuals (RMSRs) for each USDA soil texture class using four selected models (M2, M3, M5, M9) and each of the data sets used to develop pedotransfer functions. HUN, Hungarian data set; EUR, European data set; ICO, intercontinental data set. Input parameters of the four models are listed in Table 2.

View larger version (41K): [in a new window]   Fig. 4. Root mean squared residuals (RMSRs) for several matric potential values for the direct fitting of the van Genuchten equation and using four selected models (M2, M3, M5, M9) and each of the data sets used to develop pedotransfer functions. HUN, Hungarian data set; EUR, European data set; ICO, intercontinental data set. Input parameters of the four models are listed in Table 2.

View larger version (30K): [in a new window]   Fig. 5. Example of the simulations of water content time series for different depths of the KM1 soil using measured water retention curves (WRC) and as estimated with model M5 from the different data sets used to develop pedotransfer functions. HUN, Hungarian data set; EUR, European data set; ICO, intercontinental data set.

View larger version (30K): [in a new window]   Fig. 6. Measured vs. simulated water contents. All depths of all seven soils are shown using water retention curves estimated with model M5 from each data set of pedotransfer function development. HUN, Hungarian data set; EUR, European data set; ICO, intercontinental data set.