1. Assistant Professor, Dept. of Ornamental Horticulture and Landscape Architecture, China Agricultural Univ., Beijing 100193, China (corresponding author).
2. Master Degree Candidate, Dept. of Ornamental Horticulture and Landscape Architecture, China Agricultural Univ., Beijing 100193, China.
3. Professor, Key Laboratory for Environmental and Urban Sciences, Shenzhen Graduate School, Peking Univ., Shenzhen 518055, China.
4. Master Degree Candidate, Dept. of Landscape Architecture, College of Architecture and Urban Planning, Tongji Univ., Shanghai 200092, China.