[1] [1] Stone M L, Soile J B, Raun W R. Transactions of the ASAE, 1996, 39: 1623.

[2] [2] Hansen P M, Schjoerring J K. Remote Sensing of Environment, 2003, 86: 542.

[3] [3] Zhang J H, W K, Bailey J S, et al. Pedosphere, 2006， 16(1): 108.

[4] [4] Tarpley L, Reddy K R, Sassenrath-Cole G F. Crop Science, 2000, 40(6): 1814.

[5] [5] Gupta R K, Vijayan D, Prasad T S. Advance in Space Research, 2003, 32(11): 2217.

[6] [6] Demetriades-shah T H, Steven M D, Clark J A, Remote Sensing of Environment, 1990, 33(1): 55.

[9] [9] Miller J R, Hare E W, Wu J. International Journal of Remote Sensing, 1990, 11(10): 1755.

[10] [10] Blackmer T M, Schepers J S, Varvel G E, et al. Agronomy Journal, 1996, 88(1): 1.

[11] [11] Peňuelas J, Filella I, Biel C, et al. Internal Journal of Remote Sensing, 1993, 14(10): 1887.

[12] [12] Zarco-tejada P J, Miller J R, Noland, et al. IEEE Transactions on Geoscience and Remote Sensing, 2001, 39(7): 1491.

[13] [13] Xue L H, Cao W X, Luo W H , et al. Agronomy Journal, 2004, 96: 135.

[14] [14] Feng W, Yao X, Zhu Y, et al. European Journal of Agronomy, 2008, 28: 394.

[16] [16] Zhu Y, Li Y X, Feng W, et al. Canadian Journal of Plant Science, 2006, 86: 1037.