617 
0.0 0.3 0.6 0.0 0.3 0.6 0.0 0.2 0.4 0.0 0.2 0.4 
NDVI NDVI NDVI NDVI 
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WOODY LAYER 
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Measured IPAR 
Measured IPAR 
HERB LAYER 
MIXTURE 
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Measured IPAR 
Measured IPAR 
Figure 4: Comparison between the intercepted PAR measured and modeled on the sample plots, (a) millet crop, (b) 
bushiand (DB) and bush/grassland (BG) at the begining of the season, (c) grassland, (d) bush/grassland with the 
underlaying herb layer, (see text for the model used in each case).