Effect of practicing water-saving irrigation on greenhouse gas emissions and crop productivity: A global meta-analysis

作者：Mingdong Tan, Ningbo Cui, Shouzheng Jiang, Liwen Xing, Shenglin Wen, Quanshan Liu, Weikang Li, Siwei Yan, Yaosheng Wang, Haochen Jin, Zhihui Wang · 发表于：Agricultural Water Management · 年份：2025 · DOI：10.1016/j.agwat.2025.109300 · 被引用次数：24 · 研究领域：Rice Cultivation and Yield Improvement、Irrigation Practices and Water Management、Water-Energy-Food Nexus Studies

Water-saving irrigation (WSI) is extensively utilized worldwide to address the growing disparity between dwindling water supplies and increasing food demand. Moreover, WSI has attracted extensive attention for its potential to mitigate greenhouse gas (GHG) emissions in agriculture systems. In this study, a global meta-analysis of 1230 observations from 62 publications were conducted to investigate the global patterns and underlying drive r s of soil GHG emissions and crop productivity (crop yield and water use efficiency) induced by WSI, and the contributions of key factors to GHG emissions and crop productivity were further quantified. The results showed that WSI significantly alleviated the agricultural greenhouse effect by reducing carbon dioxide (CO 2 ) emission (ln RR = −0.084, 95 %CI: −0.139 to −0.028) and methane (CH 4 ) emissions (ln RR = −0.551, 95 %CI: −0.640 to −0.462). Notably, the global warming potential (GWP) and greenhouse gas intensity (GHGI) significantly decreased by −0.290 (95 %CI: −0.346 to −0.234) and −0.389 (95 %CI: −0.579 to −0.199), respectively, highlighting the effectiveness of WSI in mitigating the impacts of climate change. Furthermore, water use efficiency (WUE) significantly improved by 0.265 (95 %CI: 0.203–0327). However, WSI also led to an increase in nitrous oxide (N 2 O) emissions by 0.126 (95 %CI: 0.057–0.196) while a slight decrease of crop yield by −0.048 (95 %CI: −0.071 to −0.026). Climate factors such as mean annual precipitation (MAP) ...