Separation of soil and canopy reflectance signatures of Mid German agricultural soils
Behrens, T.(Martin Luther Univ., Halle-Wittenberg (Germany). Inst. of Agronomy and Crop Science)E-mail:[email protected] | Gregor, K. | Diepenbrock, W.
Signatures of reflected radiation were acquired for several Mid German agricultural soils in laboratory and field experiments. Results were evaluated at near-infrared spectral region at the wavelength of 850 nm. The selected soils represented different colours and brightness values reflecting a broad range of soil properties. At the wavelength of 850 nm soil reflectance ranged between 10% (black peat) and 74% (white quartz sand). The reflectance of topsoils varied from 21% to 32%. Increases of soil water content decreased signatures of soil reflectance. The interrelation of soil reflectance and soil moisture revealed a non-linear exponential function. Using knowledge of the individual signature of soil reflectance as well as the soil water content at the measurement, soil reflectance could be predicted. As a result, a clear separation is established between soil reflectance and reflectance of the vegetation cover if the vegetation index is known.
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