1. Human Geography Program, School of Tourism Management, Hubei Univ., No. 368, Youyi Ave., Wuchang District, Wuhan 430062, China.
2. Associate Professor, Hubei Key Laboratory of Regional Development and Environmental Response, Hubei Univ., Wuhan 430062, China; Human Geography Program, School of Tourism Management, Hubei Univ., No. 368, Youyi Ave., Wuchang District, Wuhan 430062, China (corresponding author).