ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 39 Issue 12 > 2013,39(12):1656-1662. DOI:10.7519/j.issn.1000-0526.2013.12.015 Prev Next
Drought Analysis Based on Multi Scale Standardized Precipitation Index of Apple Production Area in Shaanxi Province
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Abstract:
By using monthly precipitation data of 30 meteorological stations within the apple production area in Shaanxi Province from 1961 to 2010, the standardized precipitation index SPI3, SPI6, SPI9 and SPI12 were calculated. Results show that annual SPI12, spring summer autumn SPI9 and autumn SPI3 have a significant linear downward trend (P<0.05) and drought intensity tends to increase. The frequency of light drought, mild drought, severe drought and extreme drought in the study area are 16%, 6%, 4% and 0% correspondingly. Kriging interpolation method is used to draw drought frequency distribution map based on SPI value of the stations in the study area. The spatial distribution of annual drought frequency shows that four high drought frequency areas distribute with certain intervals from south to north and the drought frequency in Guanzhong Area is the highest. The spatial distribution of spring summer autumn drought frequency has a similar regulation with the frequency of annual drought. The distribution of winter spring drought frequency generally shows the trend of being higher in south than in north. The distribution of winter spring drought frequency shows that the frequency in middle is higher than in the both sides. The drought frequency in Guanzhong Area is the highest in spring, while that in the east of Weibei Area is the highest in the other seasons. In addition, 76.4% apple orchards do not have irrigation facilities, so this research is of some significance for establishing targeted drought relief measures and emergency preplans.
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