Temporal and Spatial Distribution Characteristics of Potential Evapotranspiration and Its Sensitivity to Meteorological Factors in Guizhou Province

贵州潜在蒸散时空变化特征及对气象因子敏感性（英文）

[Objective] The study aims to discuss the changes of potential evapotran- spiration and its sensitivity to meteorological factors in Guizhou Province, so as to provide important references for assessment of water resources, research of agri- cultural water conservancy and climate change. [Method] Temporal and spatial dis- tribution characteristics of potential evapotranspiration in Guizhou Province from 1961 to 2010 were analyzed, and the sensitivity of potential evapotranspiration to meteo- rological factors in Guizhou Province was studied through correlation analysis. [Re- sult] On the whole, potential evapotranspiration in Guizhou Province was higher in the southwest and the west compared with the northeast and the east. In various seasons, it was the highest in summer, followed by spring and autumn, while it was the lowest in winter. In recent 40 years, annual potential evapotranspiration showed an obvious decreasing trend in most stations of Guizhou Province. The main meteo- rological factors influencing changes of potential evapotranspiration in Guizhou Province were sunshine duration, daily maximum temperature, and daily average relative humidity. [Conclusion] Daily average temperature was not the main meteoro- logical factor affecting changes of potential evapotranspiration in Guizhou Province, while sunshine duration, daily maximum temperature, and daily average relative hu- midity had important effects on potential evapotranspiration in Guizhou Province.

[目的]探究贵州省潜在蒸散变化及对气象因子敏感性,为该地区水资源评价、农业水利研究以及气候变化研究提供重要的参考指标。[方法]通过计算1961年至2010年逐日潜在蒸散分析了贵州省潜在蒸散时空分布特征,并通过相关分析贵州区域潜在蒸散对气象因子敏感性。[结果]贵州省潜在蒸散总体分布特征为西南部高于东北部地区,西部高于东部地区,季节上夏季>春季>秋季>冬季。贵州大部分站点潜在蒸散量都呈现明显下降趋势,影响贵州省潜在蒸散变化的主要气象因子依次为日照时数、日最高温度和日相对湿度。[结论]日平均气温变化不是影响贵州潜在蒸散量变化的主导因子,日照时数、日最高温度和日相对湿度等因子的影响更为重要。