| Characteristic of spring and summer drought variations and its relation with maize yield in Shanxi Province in 1972—2012 based on SPI |
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| DOI：10.7606/j.issn.1000-7601.2018.01.34 |
| Key Words: SPI drought characteristic drought area, drought intensity Shanxi province |
| Author Name | Affiliation | | GUO Wei | Shanxi Meteorological Science Institule, Taiyuan, Shanxi, 030002, China | | LI Yin | Shanxi Meteorological Science Institule, Taiyuan, Shanxi, 030002, China | | DU Li-li | Shaanxi Meteorological Observatory, Xi'an, Shaanxi 710014, China |
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| Abstract: |
| Using precipitation of spring and summer of 50 stations in Shanxi province in 1972—2012, the drought characteristic of spatial-temporal, area, strength, and duration were analyzed based on Standardization precipitation Index SPI. The results showed that the SPI was increased by 0.15·10a-1 in spring from 1972 to 2012, drought intensity and area showed a downward trend，average drought area was 42% in 1972—1981, whereas was 26% in recent 10 years. These results suggested that spring drought has a growing trend, however, the regions that are prone to extreme drought events of regional and sustainability in spring. Summer SPI was decreased by 0.14·10a-1 from 1972—2012, however, drought intensity showed a downward trend by -0.055 with every decade has shown a marked trend than spring. Average drought area in summer increased from 11% in 1972—1981 to 14% in recent 10 years. Maize yield and rainfall are closely related. Summer droughts, especially in the moderate drought significantly affected maize yields, but production was less affected by spring drought. The correlation coefficient of SPI values and maize yield is higher than that of precipitation, suggesting that the drought analysis of the standardized precipitation index can be used in agricultural production. |
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