| Study on characteristics of winter wheat water deficit in Longdong of Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2011.06.46 |
| Key Words: winter wheat water deficit drought frequency Longdong |
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| Abstract: |
| Using the meteorological data of 15 stations in Longdong area， the reference crop evapotranspiration
(ET0)，crop water requirement of main crops (ETc)，and crop water deficit index (CWDI) of each station were calcu-
lated. The temporal and spatial distribution characteristics of wint erwheat water deficit at different growth stages in Long-dong area were studied to provide science gist for mastering law of drought and making rational distribution to avoid disad-vantages in agricultural production. The results indicated that the drought especially severe drought occured frequently in the growth period of winter wheat in Longdong area. The drought frequency was higher in vegetative growth stage while lower in reproductive growth stage. In space, drought occured with the highest frequency in north Longdong, followed by west and north middle parts, and the lowest area located in south and east parts. In anual changes, the CWDI of winter wheat in critical period of water fluctuated with a slight increase in recent 40 years generally, and increased obviously in the years after 2005. |