【摘要】 对FAO-Penman-Monteith公式、Hargreaves公式、Priestley-Taylor公式、FAO-17 Pen-man公式进行比较,应用这4种方法计算了河北省石家庄市的参考作物蒸散量。计算结果表明:FAO-17 Penman公式与Penman-Monteith公式具有很好的一致性,可代替Penman-Monteith公式计算参考作物蒸散量;Hargreaves公式与Penman-Monteith公式相比,其相关性并不显著,使用时需要进行修正;而Priestley-Taylor公式的计算值与FAO-Penman-Monteith公式的计算值相比,差异较为显著,是由于Priestley-Taylor公式没有考虑空气动力项对参考作物蒸散量的影响。因此,在使用Priestley-Taylor公式计算参考作物蒸散量时必须根据不同月份对公式中的常数项重新进行修正。更多还原

【Abstract】 Based on FAO-Penman-Monteith method,Hargreaves method,Priestley-Taylor method,and FAO-17 Penman method,the paper studied the reference crop evapotranspiration(ET0) of Shijiazhuang in Hebei province.The results show that FAO-17 Penman method has a good agreement with FAO-Penman-Monteith method and can be replaced by Penman-Monteith method in this area.Hargreaves method must be revised before used in this district.Priestley-Taylor estimates are deviated from FAO-Penman-Monteith estimates because Priestley-Taylor method has not a aerodynamic part instead of a constant α.So when using this method to calculate ET0,you should amend α for different months and seasons.更多还原