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Composition of Organic Matter Fractions for Explaining Wettability of Three Forest Soils

^a Leibniz-Zentrum für Agrarlandschafts- und Landnutzungsforschung (ZALF) e.V., Institut für Bodenlandschaftsforschung, Eberswalder Strasse 84, 15374 Müncheberg, Germany
^b Universität Hannover, Institut für Bodenkunde, Herrenhäuser Strasse 2, 30419 Hannover, Germany

View larger version (40K): [in a new window]   Fig. 1. Fourier transform-infrared spectra of soil organic matter of water [SOM(W)] (top) and sodium pyrophosphate soluble [SOM(PY)] fractions (middle) and of bulk soil (bottom) for samples from (a) Chorin, (b) Steigerwald, and (c) Waldstein forest soil profiles.

View larger version (24K): [in a new window]   Fig. 2. Contact angles (CA) related to soil organic C (SOC) contents for soil samples from Chorin, Steigerwald, and Waldstein profiles.

View larger version (20K): [in a new window]   Fig. 3. A/B ratio in Fourier transform-infrared spectra of bulk soils related to SOC content for soil samples from Chorin, Steigerwald, and Waldstein profiles.

View larger version (20K): [in a new window]   Fig. 4. Contact angle (CA) related to A/B ratio in Fourier transform-infrared spectra of bulk soil for samples from Chorin, Steigerwald, and Waldstein profiles. CA = 31.1 + 334.1 x (A/B) – 476.3 x (A/B)2; r2 = 0.62; samples C/Bw, Bsh, and E/Ah are not included in the regression.

View larger version (27K): [in a new window]   Fig. 5. Schematic illustration of possible spatial orientations of organic matter (OM), consisting of the carbon backbones chains (solid gray) and the functional groups (solid black circles) toward the mineral surface depending on the relations between the number of OM molecules the mineral surfaces and the SOM/mineral ratio (adopted from Falbe and Regitz, 1998). The suggested ranges of SOC contents are related to the soils of this study.

View larger version (21K): [in a new window]   Fig. 6. Contact angle (CA) related to (a) A/B* {i.e., A/B ratio in Fourier transform-infrared of soil organic matter with sodium pyrophosphate soluble [SOM(PY)] weighted with SOC/Clay ratio} and (b) A/B*G (i.e., A/B* weighted with the G factor) for soil samples from Chorin, Steigerwald, and Waldstein profiles.

View larger version (21K): [in a new window]   Fig. 7. Estimated values of the weighting factor G as a function of SOC/clay ratio for (a) soil organic matter with sodium pyrophosphate soluble [SOM(PY)] and (b) bulk soil for soil samples from Chorin, Steigerwald, and Waldstein profiles including the exponential regression for the A/B* values of all samples.