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Potential evapotranspiration is important to energy balance calculation and hydraulic cycle. And the value impacts water-heat balance obviously. Based on the theory of FAO Penman-Montieh equation, this manuscript taken the sources region of Yangtze River as a study case. For the calculation of Potential evapotranspiration from year 1960 to 2014, several conclusions can be summarized as follows: from the time series of calculation results, the variation trend of potential evapotranspiration in study area expressed as increase tendency, with the speed of 8.93mm per decades. And the variation trends of seasonal scale in spring and autumn are greater than summer and winter. In addition, from the perspective of spatial variation, potential evapotranspiration shows evident relationship with hydrothermal condition. The reason is that potential evapotranspiration value in the regions with better hydrothermal conditions such as riverside were more than 700mm. however, the spatial distribution of increasing trend is from southeast to northwest. And the proof is that, changes in the east of Zhiduo-Qumalai are less than 4mm per decades, but 8 to 16mm per decades in the north of Tongtian River, especially in Beiluhe and Chumaer regions.

The Spatial and Temporal Characteristics of Potential Evapotran- spiration in Sources Regions of Yangtze River Over the Past 55 Years