| Variation characteristics of reference crop evapotranspiiration of typical stations in upper basin of the jinghe River in recent 45 years |
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| DOI：10.7606/j.issn.1000-7601.2012.06.40 |
| Key Words: reference crop evapotranspiration variation characteristics the upper basin of Jinghe river |
| Author Name | Affiliation | | YANG Xiaoli | Institue of Arid Meteorology, China Meteorological Administration, Key Laboralory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Change and Disasier Reduction of CMA, Lanshou, Gansu 730020, China
Pingliang Meteorological Bureau, Pingliang, Gansu 744000, China | | Wang Lina | Pingliang Meteorological Bureau, Pingliang, Gansu 744000, China |
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| Abstract: |
| To study variation characteristics of vegetation evapotranspiration in the upper basin of Jinghe river, using the meteorological data collected from 4 typical stations in recent 45 years in the upper basin of Jinghe river, the refer-ence crop evapotranspiration(ET0)of each station was calculated with Penman-Monteith equation. The variation charac-teristics of daily, monthly and annual ET0were analysed, and he main meteorological factors which influced ET0 were anlysed. The results show that there is a very significant correlation between the daily, monthly ET0and temperature, sunshine hours and vapor pressure, and the correlation between ET0 and wind speed is relatively smaller. Both daily and montly average ET0 curves have single peak, and the peak appears in July. In reccnt 45 years, there is a significant in-creasing trend of annual ET0 in Longde, while there are no signifieant changes in other stations. There is a significant change trend of ET0 in Guyuan in summer and in Longde in winter, summer and autumn, while therer are no significant
change in each season of other stations. |
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