The work was financed by Training Plan of Young Backbone Teachers in Colleges and Universities of Hunan Province, China (Grant No. 71 ), Special Projects of Scientific and Technological Innovation in Hunan Forestry, China (Grant No. XLK201982 ), Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ50981 ), Research Foundation of Education Bureau of Hunan Province, China (Grant No. 18A166 ) and Hunan Provincial College Students' Innovation and Entrepreneurship Training Program (Grant No. 69 ).
The work was financed by Training Plan of Young Backbone Teachers in Colleges and Universities of Hunan Province, China (Grant No. 71), Special Projects of Scientific and Technological Innovation in Hunan Forestry, China (Grant No. XLK201982), Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ50981), Research Foundation of Education Bureau of Hunan Province, China (Grant No. 18A166) and Hunan Provincial College Students' Innovation and Entrepreneurship Training Program (Grant No. 69).