He Zhaowan1,Cheng Jimin2,Wan Hui'e2,Xiong Chuqiao3,Chen Li3,Han Tianfeng3,Yang Xiaomei2
1.College of Resource and Environment,Northwest A&F University;2.Institute of Soil and Water Conversation of Chinese Academy of Sciences and the Ministry of Water Resources;3.College of Animal Science and Technology,Northwest A&F University: 712100,Yangling,Shaanxi,China