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<p>Evapotranspiration (ET) is a critical component in the global water cycle, with China’s diverse geography and climate profoundly shaping its distribution. In recent years, climate change and subsurface environmental shifts have significantly affected ET. This study used SSEBop data from 2003 to 2020 and applied slope analysis, LOWESS, Hurst index, and ridge regression to investigate ET trends and their driving factors in China. The results indicate: (1) spatially, ET generally increases from northwest to southeast, but most regions show a declining trend, with annual and summer ET decreasing at rates of 1.556&#xa0;mm/year and 0.519&#xa0;mm/year, respectively; (2) NDVI, SM, SSR, Ta, and PRE are the main factors influencing ET, among which NDVI and SM play dominant roles, especially NDVI, highlighting the critical role of summer ET variability in regional hydrology and ecosystems. These findings provide valuable insights for water resource management and ecological conservation.</p>

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Analysis of temporal and spatial changes in regional evapotranspiration in China and the factors affecting them, 2003–2020

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Meijun Zheng,
  • Yuanyuan Zha,
  • Jiang Bian,
  • Yang Zhang

摘要

Evapotranspiration (ET) is a critical component in the global water cycle, with China’s diverse geography and climate profoundly shaping its distribution. In recent years, climate change and subsurface environmental shifts have significantly affected ET. This study used SSEBop data from 2003 to 2020 and applied slope analysis, LOWESS, Hurst index, and ridge regression to investigate ET trends and their driving factors in China. The results indicate: (1) spatially, ET generally increases from northwest to southeast, but most regions show a declining trend, with annual and summer ET decreasing at rates of 1.556 mm/year and 0.519 mm/year, respectively; (2) NDVI, SM, SSR, Ta, and PRE are the main factors influencing ET, among which NDVI and SM play dominant roles, especially NDVI, highlighting the critical role of summer ET variability in regional hydrology and ecosystems. These findings provide valuable insights for water resource management and ecological conservation.