| Spatial and temporal characteristics of extreme drought in summer maize growing season in Henan Province during 1971-2016 |
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| DOI：10.7606/j.issn.1000-7601.2020.02.36 |
| Key Words: extreme drought humidity index frequency spatiotemporal distribution summer maize Henan Province |
| Author Name | Affiliation | | XUE Changying | Key Laboratory of Agrometeorological Safeguard and Applied Technique, China Meteorological Administration/Henan Province, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Science, Zhengzhou, Henan 450003, China | | ZHANG Yongtao | Henan Meteorological Bureau，Zhengzhou, Henan 450003, China | | LIU Weichang | Henan Institute of Meteorological Science, Zhengzhou, Henan 450003, China |
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| Abstract: |
| The temporal and spatial characteristics of extreme droughts in summer maize growing season in Henan Province were analyzed by using surface humidity index and meteorological data from 1971 to 2016. Results showed that in past 46 years, the annual frequency of extreme drought in summer maize season in Henan ranged from 0.08 to 2.15 months, showing a weak downward trend on the whole. The number of extreme droughts in June and September was higher than that in July and August.The most frequent drought occurred in 1970s and the least were in 2000s, and was on the rise in 2010s. The percentage of extreme drought occurring stations in June and September were significantly higher than that in July and August. The value in June, July, and September showed a rising trend in 2010s. The average frequency of each year was the highest in southern regions. The total number also presented a decreasing distribution from the south to north spatially. However, the highest values in June and September were mainly distributed in northern and western areas. The occurrence of extreme droughts in the whole province had an obvious 4~8 year cycle. The frequency of extreme droughts and the percentage of occurring stations in the 2010s showed the rising trend, which should be paid attention to in summer maize production. |
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