1. a College of Resources and Environment, Tibet Academy of Agriculture and animal husbandry Nyingchi, Tibet 860000, China
2. b Agricultural Technology Extension Service Station, Agricultural and Rural Bureau of Mêdog County, Mêdog County, Tibet 860700, China
3. c Agricultural and Animal Husbandry Technology Promotion Center, Nyingchi Bureau of Agriculture and Rural Affairs, Nyingchi, Tibet 860000, China