1. College of Economics and Management, Huazhong Agricultural University, Wuhan, Hubei, P.R. China
2. Hubei Rural Development Research Center, Wuhan, Hubei, P.R. China
3. School of Economics and Business Administration, Central China Normal University, Wuhan, Hubei, P.R. China
4. Department of Resource Economics and Environmental Sociology, University of Alberta, Edmonton, Alberta, Canada