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Short-term Reestablishment of Soil Water Repellency after Wetting: Effect on Capillary Pressure–Saturation Relationship

Dep. of Soil and Water Sciences, The Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel

View larger version (18K): [in this window] [in a new window]   Fig. 1. Hygroscopic water content (H) and bulk density (b) as a function of organic matter content (OM).

View larger version (18K): [in this window] [in a new window]   Fig. 2. Surface tension (L) as a function of dissolved organic C concentration (DOC) and cumulative leachate volume (V) of citrus orchard (ORC) and eucalyptus tree (EQL) soils.

View larger version (35K): [in this window] [in a new window]   Fig. 3. Equilibrium capillary height (Heq, columns) and calculated equilibrium contact angle (eq, filled circles) after wetting at different leaching rates for natural soils (under citrus orchard [ORC] and eucalyptus trees [EQL]) and after the addition of dissolved organic matter (from compost [COM] and leonardite [LEO]) to dune sand. For the natural soils, the leaching treatments are referred to as L0, L1, L2, and L4. The three different wetting and drying cycles for the DOM addition to the dune sand are referred to as A1, A2, and A4 for both COM and LEO solutions. In each graph, the left-most column represents the reference soil.

View larger version (40K): [in this window] [in a new window]   Fig. 4. Imbibition capillary pressure ()–saturation curves (CSR), for the citrus orchard (ORC) and eucalyptus tree (EQL) soils, before and after (rewetting) L0, L1, L2 and L4 treatments. Filled points refer to the measured CSR, open points to the scaled measured reference soil CSR, dotted lines to the fitted van Genuchten (VG) model for the reference soil, and solid lines to the scaled fitted VG model for the reference soil. For each soil treatment, the upper graph is of its reference soil.

View larger version (47K): [in this window] [in a new window]   Fig. 5. Imbibition capillary pressure ()–saturation curves (CSR) soils treated with dissolved organic matter extracted from compost (COM) and leonardite (LEO) at three different wetting–drying cycles: A1, A2, and A4. Filled points refer to the measured CSR, open points to the scaled measured reference soil CSR, dotted lines to the fitted van Genuchten (VG) model for the reference soil, and solid lines to the scaled fitted VG model for the reference soil. For each soil treatment, the upper graph is of its reference soil.

View larger version (24K): [in this window] [in a new window]   Fig. 6. Normalized value of the cosine of the contact angle of the target soil (coseq1) as a function of effective saturation (S) from capillary pressure–saturation (CSR) curves of natural citrus orchard (ORC) and eucalyptus tree (EQL) soils and soils treated with dissolved organic matter extracted from compost (COM) and leonardite (LEO).

View larger version (15K): [in this window] [in a new window]   Fig. 7. The van Genuchten parameter –1 or its ratio for the reference to the target soil (0/1) as a function of the calculated value of the cosine of the contact angle (coseq) for natural citrus orchard (ORC) and eucalyptus tree (EQL) soils and soils treated with dissolved organic matter extracted from compost (COM) and leonardite (LEO).