1. Key Lab. of Agricultural Meteorology; College of Applied Meteorology, Nanjing Univ. of Information Science and Technology; Nanjing 210044 China
2. Agriculture and Agri-Food Canada, Semiarid Prairie Agricultural Research Centre; Swift Current SK Canada S9H 3X2
3. State Key Lab. of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing 210008 China