【摘要】 在河西地区黑河流域地气相互作用的观测研究中，我们在不同下垫面上进行了蒸发力的测量。发现绿洲内蒸发力仅是戈壁的４４％—５６％。绿洲内蒸发力并不比湿润地区有显著增大。夜间蒸发力所占比重较大是一普遍现象。用彭曼原式和修正式计算干旱地区的蒸发力，个别月份误差较大。利用空气饱和差拟合得到的经验计算公式效果最佳更多还原

【Abstract】 A evaporation power was observed for different underlying surface during observational study on the interaction between earth and atmosphere in the Heihe River basin in Hexi region The evaporation power in oasis was only 44% 56% of that in Gebi and was not markedly greater than that in moist area The evaporation power at night is larger than that at day.It is a general phenomenon.The calculation error of evaporation power in arid area for few months in relatively high when the evaporation was computed with Penman′s original-formula and modified formula It is optimum that the experience formula is obtained by air saturation difference fitting更多还原