TY  - SER
AU  - tong, Ling
AU  - Kang, Shaozhong
AU  - Zhang, Lu
TI  - Temporal and Spatial Variations of Evapotranspiration  for  Spring Wheat inShiyang River Basin in Northwest China
KW  - Evapotranspiration
KW  - Digital Elevation Models
KW  - Geographical Information  System
ER  -