[1] A Zinck J, I Metternicht G. Remote Sensing of Environment, 85, 1(2003).

[2] A Ghafoor, S Schubert, M Qadir et al. Land Degradation & Development, 12, 357(2001).

[3] Y Gao, T-T Zhang, J-G Qi et al. Ecological Indicators, 52, 480(2015).

[4] H Bartholomeus, K Ivushkin, K Bregt A et al. Remote Sensing of Environment, 231, 111260(2019).

[5] L Xu, Z Wang, C Zheng et al. Geoderma, 341, 68(2019).

[7] M Persson. Vadose Zone Journal, 4, 1119(2005).

[9] M Coull, D Donnelly, M Aitkenhead et al. Digital Soil Morphometrics, 89(2016).

[11] S Stiles W, G Wyszecki. Color Science: Concepts and Methods, Quantitative Data and Formulae. Second Edition ed. New York: Wiley(1982).

[12] B Minasny, P Roudier, V Rossel R A et al. Geoderma, 133, 320(2006).

[13] L Breiman. Machine Learning, 45, 5(2001).

[14] W Chang C, A Laird D, J Mausbach M et al. Soil Science Society of America Journal, 65, 480(2001).

[15] X Li, J Ren, K Zhao et al. Geoderma, 263, 60(2016).

[16] Y Fu, P Taneja, S Lin et al. Geoderma, 361, 114020(2020).