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Spectral Reflectance Properties of Crusted Soils under Solar Illumination

^a Dep. of Land, Air, and Water Resources, Univ. of California, Davis, CA 95616
^b Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

View larger version (30K): [in a new window]   Fig. 1. Schematic presentation of the reflectance measurement apparatus and arrangement for collecting spectral data.

View larger version (88K): [in a new window]   Fig. 2. Images of dry (1) noncrusted and (2) crusted surfaces of (a) Capay, (b) ReiffCM, and (c) ReiffOM soils.

View larger version (38K): [in a new window]   Fig. 3. Spectral reflectance for moist and dry crusted (a) Capay, (b) ReiffCM, and (c) ReiffOM soils.

View larger version (29K): [in a new window]   Fig. 4. Ratio of noncrusted to crusted reflectance percentage of dry samples from (a) Capay, (b) ReiffCM, and (c) ReiffOM soils.

View larger version (18K): [in a new window]   Fig. 5. Coefficient of determination (R2) and the slope (a) resulting from linear regression analysis between reflectance values at every spectral wavelength and the infiltration rate for the dry samples of (a) Capay, (b) ReiffCM, and (c) ReiffOM soils.

View larger version (15K): [in a new window]   Fig. 6. Reflectance at 1700 and 2130 nm as a function of infiltration rate for the dry samples of (a) Capay, and at 1700 nm for (b) ReiffCM and (c) ReiffOM soils.