Scholarlink

<p>Many regions worldwide are grappling with climate change impacts, including rising temperatures and increasing crop evapotranspiration (ET<sub>C</sub>) or irrigation water requirement (IWR); however, “paradoxes” of decreasing ET<sub>C</sub> or IWR despite warming conditions exist. Quantitative research on how climate change induces IWR fluctuations remains limited. This study aimed to propose a new framework to quantitatively assess the effects of climate change factors on IWR. Using the Penman-Monteith method, we calculated daily reference evapotranspiration and used the single-crop coefficient method to compute ET<sub>C</sub>. We developed a field water balance model to determine the IWR and quantified climatic factors affecting IWR changes through multifactor attribution analysis. Focusing on Jiangxi Province in China’s middle and lower reaches of the Yangtze River Basin, we conducted a comprehensive analysis between 1956 and 2021, examining the IWR of early, middle, and late rice crops. Despite the rise in global temperatures attributed to climate change, an overall decline was observed in rice IWR. This decline was significant for middle rice, not early or late rice. A significant decrease in sunshine duration, wind speed, and rising precipitation primarily drove the IWR reduction, contributing to 32.7, 18.7, and 59.4% reductions in early rice, respectively. Similarly, middle rice experienced decreases of 36.9, 20.2, and 53.1%, while in late rice, the decreases were 43.9, 26.1, and 32.9%, respectively. However, rising temperatures caused only a slight increase in rice IWR. The findings have practical implications for sustainable water management under climate change.&#xa0;&#xa0;</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Novel framework for quantitatively assessing the effects of climate change on crop irrigation water requirements

  • 期刊论文

  • 发表日期：

    2025年2月18日

查看全文
  • Xinming Yao,
  • Zuhao Zhou,
  • Genjian Yu,
  • Jiajia Liu,
  • Jinli Zheng,
  • Kun Wang

摘要

Many regions worldwide are grappling with climate change impacts, including rising temperatures and increasing crop evapotranspiration (ETC) or irrigation water requirement (IWR); however, “paradoxes” of decreasing ETC or IWR despite warming conditions exist. Quantitative research on how climate change induces IWR fluctuations remains limited. This study aimed to propose a new framework to quantitatively assess the effects of climate change factors on IWR. Using the Penman-Monteith method, we calculated daily reference evapotranspiration and used the single-crop coefficient method to compute ETC. We developed a field water balance model to determine the IWR and quantified climatic factors affecting IWR changes through multifactor attribution analysis. Focusing on Jiangxi Province in China’s middle and lower reaches of the Yangtze River Basin, we conducted a comprehensive analysis between 1956 and 2021, examining the IWR of early, middle, and late rice crops. Despite the rise in global temperatures attributed to climate change, an overall decline was observed in rice IWR. This decline was significant for middle rice, not early or late rice. A significant decrease in sunshine duration, wind speed, and rising precipitation primarily drove the IWR reduction, contributing to 32.7, 18.7, and 59.4% reductions in early rice, respectively. Similarly, middle rice experienced decreases of 36.9, 20.2, and 53.1%, while in late rice, the decreases were 43.9, 26.1, and 32.9%, respectively. However, rising temperatures caused only a slight increase in rice IWR. The findings have practical implications for sustainable water management under climate change.