Abstract: Based on meteorological data of Shenzhen from 1998 to 2007, the paper studied reference crop evapotranspiration by using Hargreaves method, Pristley-Taylor method and Irmark-Allen method with the FAO Penman-Monteith method as the standard, attempt to estimate applicability of the three methods.The results show that mean monthly reference crop evapotranspiration and annual mean reference crop evapotranspiration of Irmark-Allen and Penman-Monteith is no significant difference, but are deviated from Hargreaves method and Pristley-Taylor method which Hargreaves is the most volume and Pristley-Taylor is least.The correlation of Irmark-Allen method, Pristley-Taylor method and Penman-Monteith are overestimated.Irmark-Allen method is advisable to estimate ET0 when hard to get relatively meteorological data in Shenzhen.

Key words: reference crop evapotranspiration, calculation method, applicability

摘要： 根据深圳1998~2007日值气象资料,以4种方法计算参考作物蒸散量,并以FAO Penman-Monteith公式计算结果为标准,评价其他各公式在深圳的适用性。结果表明:Irmark-Allen公式的月平均参考作物蒸散量及年参考作物蒸散量与Penman-Monteith公式结果没有显著差异,与Hargreaves公式和Pristley-Taylor公式计算结果差异显著,Hargreaves最大,Pristley-Taylor最小;Irmark-Allen公式、Pristley-Taylor公式与Penman-Monteith公式的相关性较高,而Hargreaves相关性较低。Irmark-Allen法可作为深圳地区缺少相关气象资料条件下计算ET0较理想的替代方法。

关键词: 参考作物蒸散量, 计算方法, 适用性