Conceptualization, C.H. and X.J.; methodology, C.H.; software, C.H.; validation, C.H.; formal analysis, C.H., X.J., H.L., J.H. and Y.C.; investigation, C.H., X.J., H.L., J.H. and Y.C.; resources, C.H., X.J., H.L., J.H. and Y.C.; data curation, H.L., J.H. and Y.C.; writing—original draft preparation, C.H.; writing—review and editing, X.J.; visualization, C.H.; supervision, X.J.; project administration, X.J.; funding acquisition, X.J. All authors have read and agreed to the published version of the manuscript. The study was financially supported by the State Forestry Administration of the People’s Republic of China of key disciplines (No. 21, LinRenfa (2016)) and the “Double-first” cultivation discipline of Hunan Province (No. 469, Hunan Jiao Tong (2018)).