1. College of Economics and Management, Shenyang Agricultural University, Shenyang 110866, China
2. Research Institute of Forestry Policy and Information, Chinese Academy of Forestry, Beijing 100091, China
3. School of Tourism and Geography, Jiujiang University, Jiujiang 332005, China
4. China School of Banking and Finance, University of International Business and Economics, Beijing 100029, China
5. International Economics and Trade, Harbin Far East Institute of Technology, Harbin 150010, China