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基于河北省17个气象站点53年的逐日气象数据,利用FAO推荐的Penman-Monteith公式计算参考作物蒸散量(ET_0),分析其空间特征和时间变异性。结果表明,全省ET0不同时期分布均存在明显地区性差异,总体西部普遍大于东部;多年月ET0呈开口向下二次抛物线形分布;全省ET_0对相对湿度的敏感性最强,均值达-0.77;53年来ET_0有明显减小趋势,倾向率为-0.028mm/10a;通过0.001相关性检验分析发现,全省ET_0与相对湿度、风速、日照小时数呈极显著性相关,与气温相关性不显著,其变化主要受相对湿度和风速的影响。
Based on the daily meteorological data of 53 weather stations in 17 meteorological stations in Hebei Province, the reference crop evapotranspiration (ET_0) was calculated using the Penman-Monteith formula recommended by FAO, and its spatial characteristics and temporal variability were analyzed. The results showed that there were obvious regional differences in the distribution of ET0 in different periods in the whole province, generally more in the western part than in the east part. ET0 showed a quadratic parabola distribution with downward opening for many years. ET_0 in the whole province was the most sensitive to relative humidity, 0.77; ET_0 decreased obviously in 53 years, and the propensity rate was -0.028mm / 10a; Through the correlation analysis of 0.001, ET_0 showed significant correlation with relative humidity, wind speed and sunshine hours, and the correlation with temperature Not significant, the change is mainly affected by the relative humidity and wind speed.