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Excluding Organic Matter Content from Pedotransfer Predictors of Soil Water Retention

Faculty of Civil Eng. and Geodetic Sci., Inst. of Water Resources Management, Hydrology and Agric.Hydraulic Engineering, Univ. of Hannover, Appelstr. 9A, D-30167, Hannover, Germany

Gerd Wessolek

Dep. of Soil Science, Inst. of Ecology, Technical Univ. of Berlin, Salzufer 11-12, D- 10587, Berlin, Germany

View larger version (30K): [in this window] [in a new window]   Fig. 1. Clay (<0.002 mm) and silt (0.002– 0.05 mm) content of the calibration data set.

View larger version (12K): [in this window] [in a new window]   Fig. 2. Textural composition of the calibration data set.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Clay (<0.002 mm) and silt (0.002–0.05 mm) content of the validation data set.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Box-whisker plots (median and 10, 25, 75, and 90% percentiles) of the van Genuchten saturated volumetric water content (s) and bulk density vs. organic matter content for the calibration data set.

View larger version (29K): [in this window] [in a new window]   Fig. 5. Box-whisker plots (median and 10, 25, 75, and 90% percentiles) of the van Genuchten saturated volumetric water content (s) and fitting parameter n vs. sand content for the calibration data set.

View larger version (29K): [in this window] [in a new window]   Fig. 6. Measured vs. predicted soil water content for (A) the newly developed pedotransfer function (PTF) and (B) the PTF by Vereecken et al. (1989).

View larger version (15K): [in this window] [in a new window]   Fig. 7. Mean of the absolute difference vs. matric potential and mean Pearson correlation coefficient of the two models.