2Jarvis P G. The interpretation of the variations in leaf water potential and stomatal condu- ctance found in canopies in the field[J]. Philosophical Transactions of The Royal Society of London(Series B), 1976, 273: 593-610.
3Duff G A, Myers B A, Williams R J, et al. Seasonal patterns in soil moisture, vapour pressure deficit, tree canopy cover and pre-dawn water potential in a northern Australian savanna[J]. Australian Journal of Botany, 1997,45(2): 211-224.
4Moran M S, Clarke T R, Inoue Y, et al. Estimating crop water deficit using the relation between surface-air temperature and spectral vegetation index[J]. Remote Sensing of Environment, 1994, 49: 246-263.
5Palmer W C. Keeping track of crop moisture conditions ,nationwide: The new crop moisture index[J]. Weatherwise, 1968, 21:156-161.
6Wilhite D A, Glantz M H. Understanding the drought phenomenon :The role definitions[J]. Water International, 1985, 10: 111-120.
7Herbst P H, Bredenkamp D B, Barker H M. A technique for the evaluat ion of drough t from rainfall data[J]. Journal of Hydrology, 1966, 4(4):264-272.
8Mohan S, Rangacharya N C. A modified method for drought identification[J]. Hydrological Sciences Journal, 1991, 36(1):11-22.
9Dracup J A, Lee K S, Paulson E G. On the statistical characteristics of drought event[J]. Water Resources Research,1980, 16(2): 289-296.
10Beven K J, Kirkby M J. A physically based variable contributing area model of basin hydrology[J]. Hydrology Science Bulletin, 1979, 24(1): 43-69.
