Conceptualization, S.L., Z.B. and G.J.; Formal analysis, Z.B.; Funding acquisition, G.J.; Methodology, S.L., Z.B. and G.J.; Resources, G.J.; Supervision, S.L. and G.J.; Visualization, S.L. and Z.B.; Writing—Original Draft, S.L. and Z.B.; Writing—Review and Editing, S.L. and G.J. This research was funded by the National Key Research and Development Program of China on Global Change (No. 2017YFA0603304), the National Natural Science Foundation of China (No. 41,701,228 and 41,501,593), and Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan), grant numbers CUGL170823 and CUG170105.