作为全球气候变化的敏感器和放大器，青藏高原的水文过程是目前的研究热点，其中，蒸散发是青藏高原水文循环最难估算的分量。借助青藏高原腹地风火山地区涡度相关系统、蒸渗仪、气象观测系统获取的观测数据，采取涡度相关法、蒸渗仪测定和FAO56Penman-Monteith公式三种方式，对2019年风火山地区生长季实际蒸散发量进行了评价。结果表明：在青藏高原风火山地区高寒草甸生长季前期、中期、后期作物系数分别为0.93、1.11、1.14；三种方法获得的生长季实际蒸散发值基本相似，生长季蒸散发量（495.00±21.69） mm大于同时期降水量377.89 mm；风火山地区生长季蒸散发量日均值为（2.70±0.12） mm，风火山地区生长季不同阶段蒸散发量日均值表现为生长季中期［（3.03±0.10） mm］>生长季后期［（2.49±0.12） mm］>生长季前期［（2.23±0.18） mm］。文章中求取的不同生长阶段作物系数、蒸散发量为青藏高原类似地区蒸散发观测和模拟提供了基础资料。

As a sensor and amplifier of global climate change， the hydrological process of the Qinghai-Tibet Plateau is a hot topic at present. Among them， evapotranspiration is the most difficult component in the hydrological cycle of the Qinghai-Tibet Plateau. Based on the observation data of vorticity system， Lysimeter and meteorological observation system in the Fenghuoshan area in the hinterland of the Qinghai-Tibet Plateau， the actual evapotranspiration in the growing season of the Fenghuoshan area in 2019 was evaluated by means of vorticity correlation method， lysimeter measurement and FAO56 Penman-Monteith formula. The results showed that： in Fenghuoshan area of Qinghai-Tibet Plateau， the crop coefficients of early， middle and late growing season were 0.93， 1.11 and 1.14， respectively； the actual evapotranspiration values obtained by the three methods were basically similar. The evapotranspiration in growing season was （495.00±21.69） mm， which was greater than 377.89 mm of precipitation in the same period； The results showed that the daily mean of evapotranspiration in Fenghuoshan area was （2.70±0.12） mm in the growing season， and the daily mean value of evapotranspiration in different stages of the growing season in Fenghuoshan area was （3.03±0.10） mm> （2.49±0.12） mm> and （2.23±0.18） mm， respectively. The calculated crop coefficients and evapotranspiration at different growth stages provide basic data for evapotranspiration observation and simulation in similar areas of the Qinghai-Tibet Plateau.