節水灌漑が温室効果ガス排出に及ぼす影響：中国沿岸部と内陸部における多因子メカニズムのメタ分析
Effects of water-saving irrigation on greenhouse gas emissions: a meta-analysis of multi-factor mechanisms across Chinese coastal and inland regions (原題)
Zhitong Ma, Xueyang Sun, Hanghang Zhao, Guangyao Chi, Shuyao Ma, Yuhang Cao
🤖 gxceed AI 要約
日本語
中国の沿岸部と内陸部の76の圃場試験を対象に、節水灌漑（間断灌漑など）がメタン・亜酸化窒素・二酸化炭素の排出に与える影響をメタ分析した。その結果、節水灌漑はメタンを削減する一方で亜酸化窒素を増加させ、地域差や土壌pH、有機物量が重要な規定要因であることを示した。気候変動緩和と農業の持続可能性の両立に向けた政策的示唆を提供する。
English
A meta-analysis of 76 field studies across China examines how water-saving irrigation (deficit, alternate, intermittent) affects CH4, N2O, and CO2 emissions. Results show a trade-off: CH4 reduction but N2O promotion, with regional and soil factors (pH, SOM) as key moderators. Offers policy insights for balancing climate mitigation and agricultural sustainability.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の農業分野では、水田からのメタン排出削減が重要な課題であり、節水灌漑の導入はGHG排出削減策として注目される。本研究成果は、地域特性に応じた灌漑管理の最適化に資する知見を提供し、日本の農業政策やカーボンニュートラル目標に示唆を与える。
In the global GX context
Globally, agriculture contributes significantly to GHG emissions, and water management is a key lever. This study provides empirical evidence on trade-offs between CH4 and N2O under water-saving irrigation, informing climate-smart agriculture policies and carbon neutrality strategies, especially in rice-growing regions.
👥 読者別の含意
🔬研究者:Provides a comprehensive meta-analysis of irrigation effects on GHG emissions, with mechanistic insights via random forest and path analysis.
🏢実務担当者:Offers guidance for optimizing irrigation practices to minimize GHG emissions while maintaining water efficiency.
🏛政策担当者:Highlights the need for region-specific agricultural mitigation policies that consider soil and climate factors.
📄 Abstract（原文）
Under the escalating pressures of climate change and freshwater scarcity, understanding how irrigation management alters greenhouse gas dynamics in agricultural ecosystems has attracted increasing attention. This study conducted a comprehensive meta-analysis based on 76 field-derived publications across Chinese coastal and inland regions. We evaluated the impacts of water-saving regimes-including deficit, alternate, and intermittent irrigation-on field emissions of methane (CH 4 ), nitrous oxide (N 2 O), and carbon dioxide (CO 2 ), with random forest (RF) modeling and path analysis employed to disentangle the underlying mechanisms. The results demonstrated that water-saving practices induced a distinct biogeochemical divergence in field agroecosystems, characterized by a significant comprehensive effect of “CH 4 reduction, N 2 O promotion, and minor CO 2 mitigation” (log response ratios, ln RR=-0.48, 0.28, and -0.09, respectively). Specifically, intermittent irrigation exerted the most pronounced impact, with both CH 4 mitigation (ln RR=-0.51) and N 2 O promotion (ln RR = 0.52) reaching their peak intensities. Driven by spatial hydrothermal heterogeneity, the Southeast Coastal region exhibited the highest sensitivity in gas flux responses. Conversely, North China showed the lowest risk of N 2 O promotion (ln RR = 0.12) while maintaining robust mitigation capacity. RF modeling and meta-regression identified geographical region, soil pH, and soil organic matter (SOM) as the core predictors for the variances in CH 4 ( R 2 = 55.2%), N 2 O ( R 2 = 59.4%), and CO 2 ( R 2 = 48.1%) effects, respectively. Crucially, regression models pinpointed neutral-to-alkaline conditions (pH 7.0-7.2) as the critical threshold for N 2 O responses, beyond which alkaline soil conditions were associated with a transition from N 2 O promotion to mitigation. Path analysis further confirmed that irrigation modes exerted the strongest direct negative effect on CH 4 . Soil pH showed a highly significant direct inhibition on N 2 O, whereas precipitation introduced a notable indirect positive effect on N 2 O by driving soil acidification; meanwhile, SOM showed a dominant direct contribution to CO 2 mitigation. In conclusion, the environmental feedback of water-saving irrigation is a product of deep coupling between technical interventions and natural backgrounds. Future mitigation policies must integrate a “smart-adaptation” framework tailored to regional precipitation, soil pH, and SOM matrices, thereby orchestrating a synergy between watershed-scale green agricultural development and carbon neutrality goals.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.3389/fmars.2026.1901704first seen 2026-08-20 05:40:28 · last seen 2026-08-24 05:49:27
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