8Wu H, Wilhite D A. An operational agricultural drought risk assess- ment model for nebraska, USA [ J ]. Natural Hazards, 2004,33 ( 1 ) : 1- 21.
9M6ndez - Ban:so L A, Garatuza - Pay6n J, Vivoni E R. Quantifying water stress on wheat using remote sensing in the Yaqui Valley, Sono- ra, Mexico[J]. Agricultural Water Management, 2008, 95 (6) : 725- 736.
10Alderfasi A A, Nielsen D C. Use of crop water stress index for moni- toring water status and scheduling irrigation in wheat[ J ]. Agricultural Water Management, 2001,47( 1 ) :69-75.