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- W2090833994 abstract "Results of soil tests and correlation analyses on 94 soil samples showed that calcium carbonate content was relatively significant in influencing soil reflectance in the Botswana semiarid savanna woodland environment. Low vegetation density reflectance (Acacia and Terminalia species) was measured in situ using Landsat and SPOT wavebands against a background of typical Kalahari soils. The soils were grouped according to Munsell Color notation. Results showed that combined soil plus vegetation reflectance was dependent on the reflectance of the soil background in the case of moderately dark to light soils. Low density vegetation cover lowered the combined reflectance entirely in red wavebands. Reflectance in the near infrared was also lowered by Acacia species when the vegetation cover was lower than Leaf Area Index = 2.5. This lowering of reflectance is referred to as “darkening.” Analysis of darkening variables in the case of a moderately dark soil showed that green leaf cover contributed 16.3% (red band) and 11.8% (near infrared band) to the overall darkening effect. Savanna woodland shrubs induce this effect by internal and external drought adaptive mechanisms which decrease near infrared scatter and enhance through shadow the efficacy of red absorption as a predictor of green vegetation cover. The rate of red absorption varies as a function of soil reflectance (relative soil brightness). This is shown on twelve predictive regression curves which were developed for both Acacia and Terminalia species." @default.
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- W2090833994 date "1989-10-01" @default.
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- W2090833994 title "The darkening effect in drought affected savanna woodland environments relative to soil reflectance in Landsat and SPOT wavebands☆" @default.
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- W2090833994 doi "https://doi.org/10.1016/0034-4257(89)90043-6" @default.
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