1. College of Natural Resources and Environment, Northwest A&F University, Xianyang 712100, China
2. Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Xianyang 712100, China
3. College of Agronomy, Northwest A&F University, Xianyang 712100, China
4. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541006, China
5. Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, Guilin 541006, China