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安徽省夏玉米生长季干旱时空特征分析
引用本文:张建军,;盛绍学,;王晓东.安徽省夏玉米生长季干旱时空特征分析[J].甘肃气象,2014(2):163-168.
作者姓名:张建军  ;盛绍学  ;王晓东
作者单位:[1]安徽省气象科学研究所、安徽省大气科学与卫星遥感重点实验室,安徽合肥230031; [2]安徽省气象信息中心,安徽合肥230031
基金项目:公益性行业(气象)科研专项“夏玉米高产稳产气象保障关键技术研究”(GYH-Y201006041)、“淮河流域主要农作物旱涝损失精细化评估技术”(GYH-Y201006027)资助
摘    要:利用安徽省夏玉米主产区37个气象站点1961~2010年的气象资料,选取修订后的作物水分亏缺指数作为表征夏玉米干旱的指标,分析了安徽省夏玉米生长季内干旱频率的时空分布特征及表征干旱风险大小的干旱风险度的时空特征。结果表明:近50 a安徽省夏玉米不同发育阶段水分亏缺指数未发生显著变化,但夏玉米成熟后期的干旱现象有加重趋势;抽雄开花期是干旱频率及干旱风险较高的时段;从空间分布特征看,干旱频率与干旱风险度的空间分布特征相似,夏玉米营养生长阶段二者的高值区在淮北北部,而在夏玉米生长中后期,干旱主要发生在沿淮西部和江淮南部。整个生长季内,沿淮淮北西部是干旱高发和高风险区。

关 键 词:夏玉米  作物水分亏缺指数  干旱  频率  风险度

Temporal and Spatial Distribution Characteristics of Drought DuringSummer Corn Growing Season in Anhui Province
Institution:ZHANG Jianjun,SHENG Shaoxue,WANG Xiaodong(1. Institute of Meteorological Sciences of Anhui Province,Key Laboratory of AtmosphericScience and Satellite Remote Sensing of Anhui Province,Hefei 230031,China;2. Meteorological Information Centre of Anhui Province,Hefei 230031,China)
Abstract:Based on observation data from 37 meteorological stations during 1961 - 2010 in Anhui Province,the temporal and spatialdistribution characteristics of the drought frequency and the risk degree of drought were analyzed by using the modified crop water defi cit index (CWDI)as an indicator of characterizing drought in summer corn growing season. The results showed that the crop water def icit index during different development stages of summer corn did not change obviously in recent 50 years in Anhui. The crop water def icit index from sowing to booting - flower stage of summer corn showed a downward trend,and it had an increase trend during grain fill ing and ripening stage. Drought in the late growing stage of summer corn had an increasing trend. The seeding stage,booting - flowerstage and the late growing stage of summer corn were the high frequency periods of drought,while seedling and jointing stages were thelow frequency periods of drought. The spatial distribution of drought frequency was similar to that of drought risk degree,the high valueareas were in the north of Huaibei during the vegetative growth phase of summer corn,while during the middle and late growing stagesof summer corn,drought occurred mainly in the western the southern areas of the Huaihe River,and throughout the growing season ofsummer corn,the western area of Huaibei was the high frequency and high risk region of drought.
Keywords:summer corn  crop water deficit index  drought  frequency  risk degree
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