The Bosten Lake watershed investigated in this study has seen significant land cover and climate change. The spatiotemporal relationship between evapotranspiration (ET) and environmental factors remain unclear. In this study, trend analysis and correlation methods are applied to analyze the spatiotemporal characteristics of ET and the relationship between ET and its driving factors using remotely sensed ET data and measured climate data between 2001 and 2018. During the study period, high values of ET primarily occurr in the wetlands of the plain area and the mid‐elevation mountain areas. The ET values show a significantly increasing trend in the different vegetation types due to climate change and other factors. The ET change trend in the study area is in the range of −13.4 to ≈35.9 mm per year; the desert area exhibits a significant decrease and most of the mountain areas show a significantly increasing trend. ET is significantly correlated with land surface temperature, normalized difference vegetation index (NDVI), and solar radiation. The dominant factor affecting ET is NDVI, accounting for 15.2% of the study area. The results of this study highlight the need for appropriate land‐use strategies for managing water resources in arid land ecosystems.

中文翻译：

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博斯腾湖流域蒸散量的时空特征及其驱动因素

在这项研究中调查的博斯腾湖流域已经看到了明显的土地覆盖和气候变化。蒸散量（ET）和环境因素之间的时空关系仍然不清楚。在这项研究中，运用趋势分析和相关方法，利用2001年至2018年间的遥感ET数据和实测气候数据，分析了ET的时空特征及其与驱动因素之间的关系。主要发生在平原区和中海拔山区的湿地。由于气候变化和其他因素，不同植被类型的ET值显示出明显增加的趋势。研究区域的ET变化趋势为每年-13.4到≈35.9mm。荒漠面积显着减少，大部分山区呈明显增加趋势。ET与土地表面温度，归一化植被指数（NDVI）和太阳辐射显着相关。影响ET的主要因素是NDVI，占研究区域的15.2％。这项研究的结果突出表明，需要有适当的土地利用策略来管理干旱土地生态系统中的水资源。