1College of Grassland Science, Gansu Agricultural University, Lanzhou 730070, China
2Tongwei County Agricultural Technology Extension Center, Dingxi, 743300, China
3Department of Biological Systems Engineering, Hampton Roads Agricultural Research and Extension Center, Virginia Polytechnic Institute and State Univ., Virginia Beach, VA, USA
4Gansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China
5College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou, 730070, China
6College of Forestry, Gansu Agricultural University, Lanzhou 730070, China
7Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China
8Dingxi Institute of Soil and Water Conservation, Dingxi, 743000, China
