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Assessing Soil Hydrophobicity and Its Variability through the Soil Profile Using Two Different Methods

Brandenburg University of Technology, Cottbus, Chair of Soil Protection and Recultivation, P.O. Box 101344, D-03013 Cottbus Germany

View larger version (25K): [in a new window]   Fig. 1. Box and whisker plots of contact angles for the four study plots and the different soil horizons (for each horizon, n = 30). Short-dashed vertical lines within the boxes denote mean and solid lines median values.

View larger version (24K): [in a new window]   Fig. 2. Box and whisker plots of log(WDPT) for the four study plots and the different soil horizons (for each horizon, n = 30). Short-dashed vertical lines within the boxes denote mean and solid lines median values. WDPT, water drop penetration time.

View larger version (14K): [in a new window]   Fig. 3. Relationship between mean contact angle and mean water drop penetration time (WDPT) values of the 72 samples from the four study plots. The dotted horizontal line denotes the boundary between WDPT values < 5 s (= wettable) and > 5 s (= repellent sensu lato). The dashed vertical line denotes the boundary between contact angles lower than 90° (wettable) and higher than 90° (repellent).

View larger version (28K): [in a new window]   Fig. 4. Dependency of heterogeneity from sample volume: heterogeneity index (HI) values for contact angle (CA) and log(WDPT) at different soil depths (exemplarily for two study plots) calculated for each sample (100 cm3) and for all three samples of a soil horizon (300 cm3). WDPT, water drop penetration time.