1. Key Lab. of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China; Ministry of Education, College of Agricultural Engineering, Hohai Univ.; Nanjing 210098 China
2. State Key Lab. of Soil Erosion and Dryland Farming on the Loess Plateau, Research Center of Soil and Water Conservation and Ecological Environment; Chinese Academy of Sciences and Ministry of Education; Yangling 712100 China
3. Suqian Water Conservancy Bureau; Suqian 223800 China