| Climatic characteristics of drought and it's influence on agriculture in Gansu Province in the past 58 years |
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| DOI：10.7606/j.issn.1000-7601.2010.01.42 |
| Key Words: Gansu Province frequency of spring drought change of spring drought agriculture |
| Author Name | Affiliation | | LIN Jingjing | Institute of Arid Meteorology of China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Cli
mate Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020； Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China | | SHEN Enqing | Institute of Arid Meteorology of China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Cli
mate Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020； Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China | | LIU Dexiang | Institute of Arid Meteorology of China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Cli
mate Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020； Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China |
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| Abstract: |
| The frequency and range of yearly spring drought were calculated based on the data of precipitation in spring season (March to April) of 1951-2008 from 80 meteorological observations in Gansu Province. The precipitation anomaly percentage was the measure of spring drought. The following results were obtained: Gansu had a high frequency of spring drought that ranged from 30 to 50 percent. The frequency of spring drought in Hexi Corridor was from 40 to 50 percent. In the north of Longzhong and Longdong regions, the frequency was nearly 40 percent. In the south of Longzhong, Longnan and Gan'nan plateau, the frequency was nearly 30 percent. The frequency of spring drought in Gansu Province and in Hexi Corridor, Longdong, Longnan regions showed increasing trend, but it showed smooth trend in Longzhong. The number of spring drought was on rapid increase over the province and in different regions from 2000 to 2008. In the past 58 years, the yearly variations of spring drought range showed gradually expanding trend in Long
dong and Longnan regains and the whole province, but showed gradually narrowing trend in Hexi Corridor and Longzhong regions. |
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