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利用2009年夏季在内蒙古自治区阿拉善右旗境内巴丹吉林沙漠开展的“巴丹吉林沙漠陆一气相互作用观测试验”所取得的资料，对比分析了典型晴天条件下，巴丹吉林沙漠两种不同下垫面的辐射平衡特征和地表能量收支的日变化规律。结果表明，不同下垫面地表反射率具有明显的差异，沙漠反射率为0.33，湖区沙生芦苇反射率为0．23，沙漠反射率大于沙生芦苇反射率。巴丹吉林沙漠两种典型下垫面上，各辐射分量均具有相似的日变化特征，即白天大、夜间小。两种下垫面上的净辐射日变化与峰值基本相同，日积分值均约为8MJ·m^-2。由于下垫面性质不同，地表能量的分配也不相同。沙漠主要以感热通量为主，地表热流量其次，潜热通量很小可以忽略不计；湖区以潜热通量为主，感热通量和地表热流鼍次之。“,”Using the data from ＇The Badain Jaran Desert Land-Air Interaction Field Experiment＇, the characteristics of radiation flux and energy budget component in two dif{erent underlying surfaces （i. e. , desert and the growing reed＇s desert） were analyzed. The results show that the albedo in the desert is big- ger than that in the growing reed＇s desert. The desert albedo is 0.33, while the albedo in the growing reed＇s desert is 0.23. The energy budget components vary in different underlying surface conditions. Dur- ing the daytime, the radiation components increase with the increase of solar elevation angle. During the nighttime, the radiation components change fairly small. The net radiation fluxes of different underlying surfaces are closely. In the desert, the sensible heat flux is the biggest, and the surface heat flux is the second, the latent heat flux is fairly small. In the growing reed＇s desert, the latent heat is dominant, the sensible heat flux and the surface heat flux both have the same smaller magnitude.