1. Key Laboratory of Ecological Forestry Engineering of Sichuan Province, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, China
2. Agronomy College, Sichuan Agricultural University, Chengdu, Sichuan, China
3. Sichuan Provincial Rural Economic Information Center, Chengdu, Sichuan, China
4. Provincial Key Laboratory of Agricultural Environmental Engineering, Sichuan Agricultural University, Chengdu, Sichuan, China