1. Department of Agriculture and Forestry Economics and Management, School of Economics and Management, Northeast Agricultural University, Modern Agricultural Development Research Center, Harbin 150030, China
2. Department of Insurance, School of Economics and Management, Northeast Agricultural University, Harbin 150030, China
3. Department of Land Resources Management, School of Public Administration and Law, Northeast Agricultural University, Harbin 150030, China
4. Department of City and Regional Planning, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3140, USA