3Asrar.G et al.Estimating absorbed photosynthetic radiation and index from spectral reflectance in wheat[M]. Agron. J,1984,76:300-306.
4Sellers,P, J. Canopy reflectance, pho- tosynthesis and transpiration[M]. Int. J. Remote Sens, 1985,5: 1335 - 1372.
5F.VAN DER MEER,W.BAKKER,et al,Spatial scale variations in vegetation indices and above-ground biomass estimates., implications for MERIS[J]. International Journal Remote Sensing, 2001 : 22(17) :3381 - 3396.