基于蒸渗仪实测数据的日参考作物蒸发腾发量计算方法评价

Evaluation of methods for estimating daily reference crop evapotranspiration based on lysimeter grass experiments

为了评价参考作物蒸发蒸腾量计算方法在我国东部湿润地区的适用性,开展了充分供水的蒸渗仪矮型参考作物(草坪)试验,在分析实测参考作物蒸发蒸腾量变化规律基础上,评价了11种日ET0计算方法的计算结果。结果表明,FAO56-PM方法与实测值最为接近,综合法中的1948Penman法、辐射法中的Priestley-Taylor法和FAO24-Radiation法、温度法中的Turc法也能取得较好的结果,而Hargreaves-Samani法、FAO24CPenman法、McCloud法计算结果较差。在我国东部湿润地区的夏季,FAO56-PM方法最适用于作物需水规律的计算、模拟以及作为评价其他ET0计算方法的标准。在部分气象数据缺失条件下可以选择温度法中的Turc方法或辐射法中的Priestley-Taylor法。

To evaluate the adaptability of the methods for estimating daily reference crop evapotranspiration （ET0） in humid East China area, a set of experiment based on well-watered grass evapotranspiration measured by lysimeter was carried out. Eleven methods for estimating daily ET0 were evaluated. It was found that the FAO56-PM method is the most consistent and precise one, followed by 1948 Penman, Priestley-Taylor, FAO24-Radiation and Turc methods. The Hargreaves-Samani, FAO24 C Penman and Mc Cloud methods are poor-performed in daily ET0 calculation. It is concluded that the FAO56-PM methed is the most suitable one for crop evapotranspiration calculation and competent to the standard in evaluation daily ET0 calculation methods in humid east China. Wheveas, the Turc and Priestley-Taylor methods can be the substitute in case of only limited meteorological data is available.