[5] [5] Stoner E R, Baumgardner M F. Soil Science Society of America Journal, 1982, 45(6): 1161.

[8] [8] Wu Y, Chen J, Wu X, et al. Applied Geochemistry, 2005, 20(6): 1051.

[9] [9] Rathod P H, Rossiter D G, Noomen M F, et al. International Journal of Phytoremediation, 2013, 15(5): 405.

[11] [11] Grossl P R, Sparks D L. Geoderma, 1995, 67(1-2): 87.

[12] [12] Wang J, Cui L, Gao W, et al. Geoderma, 2014, 216: 1.

[14] [14] Sun W, Skidmore A K, Wang T, et al. Environmental Pollution, 2019, 252: 1117.

[15] [15] Sun W, Zhang X, Zou B, et al. Remote Sensing, 2017, 9(6): 632.

[16] [16] Savitzky A, Golay M J E. Analytical Chemistry, 1964, 36(8): 1627.

[17] [17] Covelo E F, Vega F A, Andrade M L. Journal of Hazardous Materials, 2007, 140: 308.

[18] [18] Xu B, Li D, Shi X. Pedosphere, 1995, 5(2): 135.

[19] [19] Liang C, Yuan H, Zhao Z, et al. Chemometrics and Intelligent Laboratory Systems, 2016, 153: 51.

[20] [20] Wang X, Chen Y, Guo L, et al. Remote Sensing, 2017, 9(3): 201.

[22] [22] Lu B, Dao P D, Liu J, et al. Remote Sensing, 2020, 12(16): 2659.

[23] [23] Abdi H. Wires: Computational Statistics, 2010, 2(1): 97.

[24] [24] Vohland M, Besold J, Hill J, et al. Geoderma, 2011, 166(1): 198.

[25] [25] Saeys W, Mouazen A M, Ramon H. Biosystems Engineering, 2005, 91(4): 393.