利用估算的太阳辐射计算浑善达克沙地参考作物蒸散速率的精度分析

The Accuracy Analysis of Reference Evapotranspiration(ET_0) Calculation by Using Estimated Solar Radiation in Hunshandake Desert Areas

利用FAO推荐的Penman-Monteith公式,以内蒙浑善达克沙地三个气象站太阳辐射实测值计算的参考作物蒸散速率(ET0)为背景值,分析了利用估算的太阳辐射计算ET0时的精确度。结果表明:太阳实际日照时数短时,ET0的计算误差比较明显,必须利用适当的方法予以修正。

Based on the reference evapotranspiration （ET0） calculated by the observed solar radiation in the three meteoro logical stations in Hunshandake desert land areas, the accuracy of reference Evapotranspiration （ET0） estimated by solar radiation was analyzed, by applying the FAO referenced Penman - Monteith formula. The results showed that the calculating errors of the ET0 would he significant when the actual duration of sunshine was short. In this case, the method should be modified.