The spatial and temporal distribution of agricultural water requirement can provide a scientific basis for regional drought and disaster mitigation management and optimal allocation of irrigation water resources. The irrigation water requirement and irrigation water requirement index of the Hebei Plain during 57 years were calculated by a long series of data of 22 weather stations from 1961 to 2017, and the spatial and temporal distribution characteristics were also analysed. The results show that (a) in this long‐term series, the irrigation water requirement was between 164 and 759 mm, and the irrigation water requirement index was between 0.33 and 0.78, which fluctuated between 1961 and 2017, and in 1977 began to show a downward trend; (b) irrigation water requirement and irrigation water requirement index in the Hebei Plain area had obvious seasonal changes during the year. Irrigation water requirement and irrigation water requirement index were the largest in April, the reasons for this phenomenon being high evapotranspiration and low effective precipitation; (c) the spatial distribution of irrigation water requirement and irrigation water requirement index in the Hebei Plain area are significantly different, both of which are larger in the central region and smaller in the Northeast and Southwest regions.

中文翻译：

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河北省平原地区主要农作物灌溉需水量的时空分布特征*

农业用水需求的时空分布可为区域干旱和减灾管理及灌溉水资源的优化配置提供科学依据。利用1961年至2017年22个气象站的长期数据，计算了河北平原57年的灌溉需水量和灌溉需水量指数，并分析了其时空分布特征。结果表明（a）在这个长期序列中，灌溉需水量在164至759毫米之间，灌溉需水指数在0.33至0.78之间，在1961年至2017年之间波动，并于1977年开始显示下降趋势；（b）河北平原地区年内灌溉需水量和灌溉需水量指数具有明显的季节变化。4月份灌溉需水量和灌溉需水量指数最大，其原因是蒸散量高，有效降水量低。（c）河北平原地区灌溉需水量的空间分布和灌溉需水量指数存在明显差异，中部地区较大，东北部和西南部较小。