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| DOI：10.13522/j.cnki.ggps.2017.0041 |
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| Analysing Spatiotemporal Variation of the Occurrence of Drought within the Growth Season of Winter Wheat in Henan Province Based on the Standardized Precipitation Index |
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ZHU Lingling, ZHANG Jingjing, LI Zhiguo, ZHANG Yanwei, LIANG Chunling
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Department of Surveying and Planning, Shangqiu Normal University, Shangqiu 476000, China;.Economic and Management School, Zhongyuan University of Technology, Zhengzhou 450000, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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| Abstract: |
| 【Objective】 This paper is aimed to analyse the spatiotemporal variation of the occurrence of drought as well as its pattern and impact on yield of winter wheat in Henan Province.【Method】 We first calculated the standardized precipitation index (SPI) using monthly meteorological data measured at 17 weather stations from 1961 to 2015; we then used it to analyse the spatiotemporal variation of the droughts occurring within the growth season of the wheat and their consequent effects upon grain yield across the province. 【Result】The frequency of the drought occurrence in early growth stage of the wheat varied between 24.1%~37.0% across the province, with the minimum occurring in Gushi and Zhumadian and the maximum seen in Sanmenxia and Xinxiang. The frequency of the drought occurring at tillering stage varied between 18.5%~31.5%, with the minimum seen in Kaifeng and the maximum in Lushi. The frequency of the drought occurring at greening-earing-maturity stage varied between 27.8%~38.9%, with the minimum occurring in Shangqiu, Xihua and Xinyang, and the maximum in Baofeng. The frequency of the drought during the whole growth season varied between 24.1%~38.9%, with the minimum being in Gushi and the maximum in Mengjin. The analysis revealed that the early stage and the green-heading-maturity stage of the wheat will be drought dominant, while the tillering stage will be relatively wet; droughts occurring at greening-earing-maturity stage had a significant impact on the yield. 【Conclusion】The early growth stage and greening-earing-maturity stage are predicted to be more water-stress for wheat growth, and appropriate actions should be taken to tackle the drought to safeguard wheat production. |
| Key words: drought; standard precipitation index (SPI); winter wheat |
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