中文摘要：

根据青海湖流域刚察气象站1958--2006年的逐日气象资料，分别采用Penman—Monteith公式和Hargreaves公式对参考作物潜在腾发量进行了计算并对两种方法的计算结果进行了对比分析，发现两种方法的计算结果存在较大差异。为了提高Hargreaves公式在该地区的适用性，引入平均相对湿度因子对Hargreaves公式进行了修正，并利用刚察气象站2007—2012年的逐日气象资料对Hargreaves公式修正式的计算结果进行了验证，发现对Hargreaves公式的修正结果非常好，在青海湖流域可以作为计算参考作物潜在腾发量的一种计算方法而使用。

英文摘要：

Reference crop evapotranspiration （ET0）, one of the important parameters in hydrologic cycle, plays art important role in estimating and predicting crop evapotranspiration, water management, establishing irrigation scheme and other practice of agricultural production. Penman-Monteith equation is an accurate approach in estimating ETo, but it is not suitable in places that can＇t provide so many meteorological parameters. In Qinghai Lake basin, Penman-Monteith equation cannot be widely used for the lack of complete meteorological observation, so another method should be find to calculate ETo. Hargreaves equation is an alternative ETo estimation equation when only air temperature data is available. In order to enhance the appropriateness of Hargreaves equation within this area, using the meteorologic data from 1958 to 2006 of Gangcha meteorological station over Qinghai Lake basin, the Hargreaves equation was revised by introducing into the humidity factor, and the modified Hargreaves equation was verified with the meteorologic data from 2007 to 2012 of Gangcha meteorological station. The results showed that the modification of Hargreaves equation was successful, the modified Hargreaves equation could be used to calculate ETo accurately over Qinghai Lake basin.