高原水田における土壌有機炭素と二酸化炭素に対する異なる水管理手法の影響
Effects of Different Water Management Practices on Soil Organic Carbon and Carbon Dioxide in Plateau Paddy Fields (原題)
Shufang Wang, Wei Liang, Shiwei Li, Ruijie Li, Ying Wang, Lihong Chen
🤖 gxceed AI 要約
日本語
中国・大理洱海盆地の高標高水田で4つの水管理（慣行湛水、制御灌漑、制御灌漑＋還元湛水）を比較し、土壌有機炭素（SOC）とCO2排出への影響を解析した。制御灌漑単独は深層のSOCを短期蓄積するが表層炭素プールの安定性を損ない、CO2フラックスが最大となった。制御灌漑に1/4H還元湛水を組み合わせたW4が深層炭素蓄積と低CO2排出を両立し、総合評価で最良とされた。
English
Four water-management regimes were compared in high-altitude paddy fields of the Dali Erhai Basin to assess soil organic carbon (SOC) and CO2 emissions. Controlled irrigation alone favored short-term deep-layer SOC accumulation but destabilized the surface carbon pool and produced the highest CO2 flux. Controlled irrigation with 1/4H return flooding (W4) achieved the best balance of deep-layer carbon sequestration and low CO2 emissions.
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
農業由来の炭素貯留・排出削減はScope 3や食品・農業セクターの気候目標に関わるが、本論文は圃場管理の実証研究であり、SSBJ開示や投資家対応への直接的示唆は限定的。日本の水田農業の脱炭素を検討する読者には方法論の参考になる。
In the global GX context
Agricultural soil-carbon management is increasingly relevant to Scope 3 and land-sector accounting under CSRD/ISSB, but this field-level agronomy study offers indirect implications for corporate disclosure. It adds empirical evidence on water management as a lever for soil carbon sequestration and CO2 mitigation in rice systems.
👥 読者別の含意
🔬研究者:水管理と土壌炭素・CO2動態の関係に関する圃場実証データとして参照できる。
🏢実務担当者:農業・食品企業がScope 3の土地利用排出を検討する際の基礎的知見となる。
🏛政策担当者:水田の炭素貯留と排出削減を両立する灌漑政策の設計に示唆を与える。
📄 Abstract（原文）
To investigate the effects of water management on soil organic carbon (SOC) dynamics and carbon dioxide (CO₂) emissions in highaltitude paddy fields, this study established four water treatments in the Dali Erhai Basin: conventional flooding (W1), controlled irrigation (W2), controlled irrigation combined with 1/3H return flooding (W3), and controlled irrigation combined with 1/4H return flooding (W4), and systematically analyzed the changes in SOC content and CO₂ emission characteristics under different water management regimes. The results showed that different water management practices significantly affected SOC dynamics and CO₂ emission characteristics. The controlled irrigation combined with return flooding treatments maintained relatively high SOC content during the early and midtolate growth stages, especially in the 10-20 cm soil layer; SOC content decreased after drainage at the yellow ripening stage, but the W4 treatment showed the largest increase in deeplayer SOC at harvest (7.44% relative to pretransplant) and also had the highest average SOC content over the entire growth period. Although controlled irrigation (W2) favored shortterm accumulation of SOC in deeper layers, it was detrimental to the longterm stability of the surface carbon pool, and it resulted in the highest soil CO₂ emission flux due to frequent drying–rewetting cycles. The W3 and W4 treatments significantly reduced soil CO₂ emissions, with W4 having the lowest average soil CO₂ flux (80 mg·m⁻²·h⁻¹). Although the W3 treatment had the highest total CO₂ emissions due to vigorous plant growth, W4 achieved higher deeplayer carbon sequestration and lower soil CO₂ emissions while maintaining moderate total emissions (lower than W3). Based on comprehensive evaluation of SOC accumulation, profile distribution, and CO₂ emissions, W4 was identified as the water management regime with the best overall performance. This study provides a theoretical basis for optimizing water management strategies in highaltitude paddy fields and achieving synergistic effects between carbon sequestration and emission reduction.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.15244/pjoes/237461first seen 2026-11-14 05:11:11
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