| Weibei Plateau precipitation fluctuations in the past 40 years, characteristics and calculation of crop drought index analysis |
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| DOI：10.7606/j.issn.1000-7601.2010.05.47 |
| Key Words: Weibei plateau rain character dry index |
| Author Name | Affiliation | | MA Yanqing | Weather bureau of Xianyang city, Xianyang, Shaanxi 712000, China | | LIU Xinsheng | Xianyang academe of Agro-meteoyology, Xianyang, Shaanxi 712035, China | | LIU Changmin | Xianyang academe of Agro-meteoyology, Xianyang, Shaanxi 712035, China | | MA Wen | Weather bureau of Xianyang city, Xianyang, Shaanxi 712000, China | | WANG Ying | Weather bureau of Xianyang city, Xianyang, Shaanxi 712000, China |
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| Abstract: |
| The use of Shaanxi Weibei area 24 meteorological stations, 1968～2007, 40 years of daily precipitation data, analysis of the fluctuations in regional precipitation characteristics of the past 40 years. The results showed that: Weibei area for many years the average rainfall distribution in space was “two high and one low” type, decreasing from west to east; seasonal distribution is uneven, precipitation mainly in summer and autumn, accounting for annual precipitation of 75%～80%; interannual variability is more complicated, in 24 stations in the upward trend of 9 stations, the downward trend in three stations, 12 stations did not change significantly. The overall trend of precipitation was upward. Based on the soil water balance principle, with soil moisture simple formula, Weibei plateau dryland drought index of major agricultural crops was calculated. |
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