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Water Repellency of Aggregate Size Fractions of a Volcanic Ash Soil

^a Graduate School of Science and Engineering, Saitama Univ., 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
^b Environmental Engineering Section, Dep. of Biotechnology Chemistry, and Environmental Engineering, Aalborg Univ., Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark
^c Dep. of Agroecology, Univ. of Aarhus, P.O. Box 50, DK-8830 Tjele, Denmark

View larger version (10K): [in this window] [in a new window]   Fig. 1. Soil water characteristic curves for four soil samples. Fitted curves with the bimodal van Genuchten soil-water retention model (Durner, 1994) by Eq. [1] are given. The s values are plotted at pF = 0.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Chart of pretreatment procedures for the soil samples before the molarity of ethanol droplet (MED) tests. "Soil samples at pF 3.3 and 4.1" are soil samples with volumetric water contents corresponding to pF 3.3 and 4.1 in the soil-water retention curve. The water repellency (WR) curves (see Fig. 3) are depicted by using data for oven-dried samples at 60°C (subchart given by the gray boxes).

View larger version (10K): [in this window] [in a new window]   Fig. 3. Water repellency (WR) curve as a function of (a) volumetric soil water content and (b) pF for the four water repellent sieved soil samples (<2 mm) at each soil depth. The pF values were obtained by using regression curves in Fig. 1. The WR-max, non-WR, pFWR-max, and pFnon-WR for the soil of 0.10–0.15 m depth are given by arrows.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Comparison of volumetric water content and water repellency (WR) as a function of pF. Soil samples are from depths of (a) 0.00–0.05 m, (b) 0.03–0.06 m, (c) 0.05–0.10 m, and (d) 0.10–0.15 m.

View larger version (9K): [in this window] [in a new window]   Fig. 5. Relationships among WR parameters. (a) integrated areas below WR curves, SWR() and SWR(pF), as a function of soil organic carbon, SOC, (b) soil-water content at maximum/minimum repellency, WR-max/non-WR, and (c) SWR() as a function of WR-max/non-WR. Regression lines and intercept values are given.