1. College of Landscape Architecture and Tourism,
Hebei Agriculture University, Baoding 071000, China.
2. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, No. 73, Daqiao Road, Fuyang, Hangzhou 311400, Zhejiang Province, China.
3. New Zealand School of Forestry,
University of Canterbury, Private Bag 4800, 8041 Christchurch, New Zealand.