1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3. Dryland Farming Institute, Hebei Academy of Agriculture and Forestry Sciences, Hengshui 053000, China
4. Key Laboratory of Crop Drouht Tolerance Research of Heibei Province, Hengshui 053000, China