Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (5): 152-158.doi: 10.11924/j.issn.1000-6850.casb15090002

Special Issue: 农业气象

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Analysis of Spatial and Temporal Characteristics of Drought in Liaocheng Region Based on Z Index

李楠,, and   

  • Received:2015-09-06 Revised:2015-10-21 Accepted:2015-10-23 Online:2016-02-19 Published:2016-02-19

Abstract: The paper aims to understand the natural precipitation deficit and explore the law of drought in Liaocheng. Based on 8 stations’monthly precipitation data in 1970- 2010, Z index method was used to calculate the drought and flood index. Then the drought and flood levels were determined, and drought characteristics of more than 4 decades were analyzed from 2 aspects of time and space in Liaocheng. The results showed that in inter-annual variation, drought and flood appeared alternatively and continuous drought was prone to happen. Overall, there were more droughts than floods. The 3 years and 7 years cycle of droughts and floods were obvious. In spatial distribution, there were more extremely severe droughts in the northeast than that in the southwest, severe droughts happened more often in the eastern area than that in the western area, and there were more droughts in the west than that in the east. The highest drought frequency was found in the northwest.

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