为了提高宁夏引黄灌区参考作物蒸散发（reference crop evapotranspiration，
ET0）简化公式的精度，基于5个国家级基本气象站点1962~2017年气象资料，分别使用Priestley－Taylor(P－T)、FAO-24 Radiation(FAO-24)、1948 Penman-Monteith（1948P-M）、Hargreave－Samani(H-S)和Makkink（Ma）五种简化计算方法计算多年日ET0，以Penman－Monteith（P-M）公式计算为标准，通过使用1962~2000年P-M公式所得日值，分别对五种简化计算方法进行线性拟合，用最小二乘法确定出经验系数k和c，并用2001~2017年计算数据对拟合公式进行验证，使用平均绝对误差（MAE）、平均相对百分误差（MRPE）、Nash-Sutcliffe系数（NS）为精度评判标准。结果表明：修订前，各简化计算方法对宁夏引黄灌区适用性及精度较差，经过修正后，其拟合效果和精度均有不同程度的提高。因此，经过修正后的五种简化计算方法在宁夏引黄灌区有较高的适用前景。
Abstract
In order to improve reference crop evapotranspiration in Ningxia Yellow Ｒiver Irrigation District ( reference crop
evapotranspiration，ET0 ) ，This paper simplifies the accuracy of the formula，based on the daily meteorological data of the 5 national－level
basic meteorological stations in Ningxia Yellow Ｒiver Irrigation District from 1962 to 2017 by using Priestley－Taylor ( P －T) ，FAO－ 24
Ｒadiation ( FAO－24) ，and 1948 Penman respectively． Monteith ( 1948P－M) ，Hargreave－Samani ( HS) and Makkink ( MA) five simplify
calculation methods to calculate the multi－year average ET0，using the Penman－Monteith ( PM) formula as the standard． The obtained daily
values are linearly fitted to the five simplified calculation methods，the slope k and the empirical coefficient c are determined by the least
squares method，and the fitting formula is verified by the calculated data from 2001 to 2017 by using the mean absolute error ( MAE) ． The
average relative percentage error ( MＲPE) and Nash－Sutcliff coefficient ( NS) are used to evaluate the accuracy of each site in Ningxia
Yellow Ｒiver Irrigation District． The results show that before the revision，the simplified calculation methods have poor applicability and
accuracy for each site in Ningxia Yellow Ｒiver Irrigation District． After modification，the fitting effect and accuracy are improved to different
extents． Therefore，the five simplified calculation methods have a high application prospect in Ningxia Yellow Ｒiver Irrigation District．
关键词
宁夏引黄灌区 /
参考作物蒸散量 /
适用性评价 /
经验系数
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Key words
Ningxia Yellow Ｒiver Irrigation District /
reference crop evapotranspiration /
applicability evaluation /
empirical coefficient
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