[4] [4] Gitelson A A, Merzlyak M N. Journal of Plant Physiology, 1996, 148(3-4): 493.

[5] [5] Sims D A, Gamon J A. Remote Sensing of Environment, 2002, 81(2): 337.

[6] [6] Rouse J W, Haas R H, Schell J A, et al. Monitoring the Vernal Advancement of Retrogradation of Natural Vegetation(Greenbelt, MD: NASA/GSFC), 1974.

[7] [7] Kim M S, Daughtry C S T, Chappele E W, et al. Proceedings of the 6th Symposium on Physical Measurements and Signatures in Remote Sensing Val D’Isere, 1994. 299.

[8] [8] Daughtry C S T, Walthall C I, Kim M S. Remote Sensing of Environment, 2000, 75(2): 229.

[9] [9] Penuelas J, Baret F, Filella I. Photosynthetica, 1995, 31(2): 221.

[10] [10] Dash J, Curran P J. International Journal of Remote Sensing, 2004, 25(23): 5003.

[11] [11] Gitelson A A, Vina A, Ciganda V, et al. Geophysical Research Letter, 2005, 32(181): L8403.

[12] [12] Le Maire, Francois C, Dufrene E. Remote Sensing of Environment, 2004, 89(1): 1.