1. College of Water Resources; Shenyang Agricultural Univ.; Shenyang Liaoning 110866 China
2. Donggang Investigation and Design Institute of Water Conservancy; Donggang Liaoning 118300 China
3. Key Experimental Station of Irrigation and Drainage Technology; Donggang Liaoning 118300 China
4. College of Agronomy; Shenyang Agricultural Univ.; Shenyang Liaoning 110866 China