1. Ningxia Houde Environmental Protection Technology Co., Ltd, Yinchuan 750000, China
2. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China
3. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China
4. College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
5. College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China