1. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
2. Institute of Tibet Plateau Ecology, Tibet Agricultural and Animal Husbandry University, Nyingchi 860000, China
3. Key Laboratory of Forest Ecology in Tibet Plateau, Tibet Agricultural and Animal Husbandry University, Ministry of Education, Nyingchi 860000, China
4. College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
5. College of Agronomy, Shenyang Agricultural University, Shenyang 110866, China