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<p>Understanding how vegetation phenology affects evapotranspiration (<i>ET</i>) is essential for evaluating hydrological responses under climate change. However, the quantitative contribution of phenological shifts to <i>ET</i> remains unclear. In this study, we extracted the start of the growing season (SOS), end of the growing season (EOS), and growing season length (GSL) across China from 1982 to 2018 using the TIMESAT method, and incorporated dynamic phenological parameters into the Priestley-Taylor Jet Propulsion Laboratory (PT-JPL) model. The improved model reduced <i>ET</i> simulation errors by 20–40% compared with the original version. Results showed that SOS advanced by 0.12 days·yr<sup>-1</sup>, EOS delayed by 0.07 days·yr<sup>-1</sup>, and GSL lengthened by 0.18 days·yr<sup>-1</sup>. The national mean <i>ET</i> was 382.23 days·yr<sup>-1</sup>, with a slight decreasing trend of -0.21&#xa0;mm·yr<sup>-1</sup>. Phenological changes contributed 3.82&#xa0;mm·yr<sup>-1</sup> to <i>ET</i> increase, accounting for 7.53% of the total change. These findings highlight the non-negligible role of vegetation phenology in regulating terrestrial water fluxes under ongoing climate warming.</p>

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Vegetation Phenology Changes in China from 1982 to 2018 Increased Evapotranspiration

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Jian Shengqi,
  • Kong Lilin,
  • Dou Shentang,
  • Yu Xin

摘要

Understanding how vegetation phenology affects evapotranspiration (ET) is essential for evaluating hydrological responses under climate change. However, the quantitative contribution of phenological shifts to ET remains unclear. In this study, we extracted the start of the growing season (SOS), end of the growing season (EOS), and growing season length (GSL) across China from 1982 to 2018 using the TIMESAT method, and incorporated dynamic phenological parameters into the Priestley-Taylor Jet Propulsion Laboratory (PT-JPL) model. The improved model reduced ET simulation errors by 20–40% compared with the original version. Results showed that SOS advanced by 0.12 days·yr-1, EOS delayed by 0.07 days·yr-1, and GSL lengthened by 0.18 days·yr-1. The national mean ET was 382.23 days·yr-1, with a slight decreasing trend of -0.21 mm·yr-1. Phenological changes contributed 3.82 mm·yr-1 to ET increase, accounting for 7.53% of the total change. These findings highlight the non-negligible role of vegetation phenology in regulating terrestrial water fluxes under ongoing climate warming.