| 天气与气候 |
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| Drought Disaster and Climate Change in the Qing Dynasty in Central Gansu Province |
| CHENG Ai-fang1， ZHAO Jing-bo2， FENG Qi1 |
| 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Center for Historical Environment and Socio-economic Development in Northwest China, Xian 710062, China |
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Abstract Based on data of historical documents, we studied the ranks, spatial and temporal changes and climatic background of drought disasters in the Qing dynasty in central Gansu province. It was found that there were 136 times of drought disasters in the Qing dynasty in central Gansu, approximately once every 1.97 years on average. The drought disasters were mainly morderate ones which accounted for 50% of the total, followed by severe ones accounted for 30.9% of the total, and that very severe and slight ones accounted for 11% and 8.1% of the total, respectively. Variation of drought disasters could be divided into four periods: there were the fewest drought disasters in the first phase from 1640s to 1700s; the second phase from 1710s to 1770s was a fast growth stage with high frequency; the third phase from 1780s to 1820s was a little change stage with high frequency; the fourth phase from 1830s to 1900s was a very high frequency period. Drought disasters mainly occurred in summer, followed by spring. The severity of drought disasters in the northeast region are more serious than in southwest region in central Gansu. The climate change in central Gansu during the Qing Dynasty corresponded well with tree ring records in western China.
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Received: 21 January 2010
Published: 20 November 2011
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2011, Vol. 31 
