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Water Repellency and Critical Soil Water Content in a Dune Sand

^a Alterra, Land Use and Soil Processes Team, P.O. Box 47, 6700 AA Wageningen, The Netherlands
^b Dep. of Geography, Univ. of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
^c Dep. of Civil Engineering, Demokritus Univ. of Thrace, 67100 Xanthi, Greece

View larger version (150K): [in a new window]   Fig. 1. Nonuniform wetting in the dune sand. Dark-colored areas in the soil pit indicate an actually wettable surface layer and preferential flow paths. The light colors represent the dry, actually water repellent sand areas.

View larger version (35K): [in a new window]   Fig. 2. Minimum (-), mean (o), and maximum (-) soil water contents of samples taken at six depths in the eight transects (n = 35) between 21 April and 12 Oct. 1999 and in the two soil blocks (n = 75) on 25 Oct. and 23 Nov. 1999.

View larger version (61K): [in a new window]   Fig. 3. Contours of the volumetric soil water content in horizontal planes (25 by 75 cm) at six depths in the 25 October soil block.

View larger version (98K): [in a new window]   Fig. 4. Contours of the persistence of actual and potential (after drying at 25°C) water repellency in horizontal planes (25 by 75 cm) at six depths in the 25 October soil block.

View larger version (78K): [in a new window]   Fig. 5. Relative frequency (%) of the persistence of actual water repellency of field-moist samples (n = 35) taken at six depths in the transects on 22 April, 17 May, and 21 September, and of potential water repellency of these samples after drying at 25, 65, and 105°C (n = 35).

View larger version (45K): [in a new window]   Fig. 6. Relationship between the soil water content and the persistence of the actual water repellency of all samples taken at six depths between 17 May and 23 Nov. 1999. The transition zone, with critical soil water contents is indicated with a grey tone.

View larger version (20K): [in a new window]   Fig. 7. Transition zone with critical soil water contents for the dune sand to a depth of about 20 cm.