【摘要】 根据华北地区6个气象站点的历史气象资料,以Penman法结果作为对照,对较为常用的另一计算参照作物腾发量的方法—Priestley Taylor方法的适用性问题进行了探讨。年值序列比较显示,在华北干旱半干旱的气候条件下,Priestley Taylor结果比Penman结果低11%～27%,两者最大相差346 5mm,最小相差112 2mm,多年平均相差240 5mm。对历年逐月序列分析显示,Priestley Taylor方法在7、8月份的应用效果很好,与Penman结果没有显著差异;但在其它月份应用效果较差,与Penman结果均存在显著差异。年值及月值序列的相关分析均显示,空气动力项与辐射项之比是影响Priestley Taylor方法应用效果的重要因素,且二者呈显著负相关。该比值越小,2种方法的吻合程度越好,Priestley Taylor方法应用效果也越好;反之,应用效果越差。随着Priestley Taylor方法在作物模拟模型中的广泛应用,干旱气候条件下如何对Priestley Taylor公式参数进行适当订正,值得进一步研究。更多还原

【Abstract】 Based on the meteorological data from 6 weather stations in North China,the calculated reference evapotranspiration from Penman formula is compared with that from PriestleyTaylor equation.It is found that the yearly value from Penman formula is lower than that from PriestleyTaylor equation in the range of 11%-27%.The comparison of monthly value shows that the difference between these two methods is not significant in July and August,but it is remarkable in the else season.The correlation analysis of yearly value and monthly value indicates that the ratio of aerodynamic to net radiation is the key factor affecting the suitability of PriestleyTaylor applied to dry climate condition.The smaller the ratio,the better for the equation suited to dry condition.更多还原