Spatiotemporal characteristics of drought during summer maize growing season in Huang-Huai-Hai area for recent 40 yearsChinese Full Text
XUE Changying;MA Zhihong;HU Chengda;Key Laboratory of Agrometeorological Safeguard and Applied Technique of CMA,Henan Province;Henan Institute of Meteorological Science;
Abstract: Drought is the main agro- meteorological disaster to restrict the summer maize production in the Huang-Huai- Hai area. It is of great important to clarify the spatiotemporal distribution law of agricultural drought in main food production area for the prevention and reduction of disasters. Based on the crop water deficit index（ CWDI）and drought grade index,the spatiotemporal change law of drought during the summer maize growing season in past 40 years was analyzed. Results show that,the CWDI and probability of drought are the largest at the sowing-emergence stage. Other than the sowing- emergence stage,probability of drought decreases with the increase of drought grade. The sowing- emergence stage is when the probability for the special drought grade was the highest.There was no significant temporal trend for CWDI at each stage,but there are large fluctuations between years,es-pecially at the mid- late stages. Drought is most serious in 1997 in the recent 40 years with long time duration and widely affected areas. Spatial distribution range of CWDI varies with the law of reduction- enlargement- reduction from 1971- 1980 to 2001- 2010. The drought was the most serious in 1991- 2000 and the lightest in 2001-2010. From the spatial distribution,CWDI and drought grade basically present the gradually increasing trend from east to west and from south to north. The most part of Hebei,the north and west parts of Henan and mid- west of Shandong were the areas with high probability of drought. Due to the increasing fluctuations between years,extreme drought events would occur in a larger probability during the mid- late season of summer maize. It is strongly advised to strengthen the prediction and prevention of drought,especially in the north and west parts of Huang- Huai- Hai area.
Keywords：
drought; crop water deficit index（CWDI）; summer maize; spatiotemporal characteristics; Huang-Huai-Hai area;
- DOI：
10.13577/j.jnd.2016.0201
- Series：
- Subject：
- Classification Code：
S513;S423
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