[1] [1] Wang H J, Shi X Z, Yu D S, et al. Ecology and Environmental Sciences, 2010, 19: 197.

[2] [2] Bao S D. Soil and Agricultural Chemistry Analysis. Beijing: China Agriculture Press, 2000. 27.

[3] [3] Palacios-Orueta A, Ustin S L. Remote Sensing of Environment, 1988, 65(2): 170.

[4] [4] Liu S B, Li Y, He C S. Soil Science, 2013, 178(3): 138.

[5] [5] Zhang F S, Qu W, Yin G H, et al. Chinese Journal of Applied Ecology, 2010, 21(4): 883.

[6] [6] Zhou S, Wang Q L, Peng J, et al. Earth Sciences, 2014, 57(7): 1671.

[7] [7] Bilgili A V, van Es H M, Akbas F, et al. Journal of Arid Environments, 2010, 74: 229.

[8] [8] Liu J, Li Y, Liu S B. Spectrosc. Spectr. Anal., 2012, 33(12): 3354.

[9] [9] Qin J, Ding Y J, Wu J K, et al. Journal of Arid Land, 2013, 5(3): 366.

[10] [10] Peng H T. Horton R, Lei T W, et al. Journal of Soils and Sediments, 2015, 15: 937.

[11] [11] Ge Y F, Morgan C L S, Grunwald S, et al. Geoderma, 2011, 161: 202.

[12] [12] Feng Y Z, Sun D W. Talanta, 2013, 105: 244.

[13] [13] Li Y, Liu S B, Liao Z H, et al. Canadian Journal of Soil Science, 2012, 92(6): 845.

[14] [14] Mark J, Michael A. The Appraisal Journal, 2001. 89.

[15] [15] Li L N, Li Q B, Yan H L, et al. Spectrosc. Spectr. Anal., 2010, 30(11): 3041.

[16] [16] Sun Yongmeng, Ding Jianli, Qu Juan, et al. Transactions of the Chinese Society of Agricultural Engineering, 2012, 28(20): 180.