河北省参考作物蒸散量时空变异性分析

Temporal-spatial Variation Analysis of Reference Crop Evapotranspiration in Hebei Provence

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 17 meteorological stations which provided 53 years of daily meteorological data of Hebei Provence, Penman-Monteith algorithm recommended by FAO was used to calculate the reference crop evapotranspiration （ET0 ）. The space characteristics and temporal variability of ET0 was analyzed. The results show that the distributions of ET0 in different periods existed regional difference, and E% in the west was widely larger than those in the east; the average monthly ET0 in 53 years presented as a quadratic parabolic going downwards; ET0 apeared a high sensitivity to relative humidity, and the sensitive coefficient was -0.77; the values of ET0 appeared a downward trend on -0. 028 mm/10a; ET0 was significantly correlated with relative humidity, wind speed, sunshine duration which was pass through the 0. 001 correlation test, and it was uncorrelated with the temperature; the variety of ET0 was mainly affected by the relative humidity and wind speed.