Describing prairie C4 plant species area coverage using hyperspectral reflectance

ABSTRACTC3 and C4 photosynthesis pathways represent fundamental differences in vegetation characteristics and physiology. Spectral reflectance collected on the ground and from satellite successfully described the fraction of C4 species coverage in the Konza Prairie Long-Term Ecological Reserve (LTER) which supports a grassland made up of mixtures of C3 and C4 plants. Plant species area coverage was measured within the LTER and also at study sites of the First International Land Surface Climatology Project Field Experiment (FIFE) in 1987. Ground-measured visible-near infrared (VNIR) spectral reflectances were collected in FIFE and from a 2015 Hyperion spectrometer image from the Earth Observing 1 (EO-1) satellite.Partial least squares regression (PLSR) successfully described C4 cover fraction from the FIFE ground VNIR reflectances (R2 = 0.75). Convolving the bands to 10-nm Hyperion spectral bands decreased the accuracy of the retrievals (R2 = 0.43). PLSR applied to Hyperion reflectances extracted for the L...