Rapid Decomposition of Brittle Rice Straw Reduces Greenhouse Gas Emissions and Shifts Carbon Allocation in Paddy Soils
脆性イネわらの迅速分解が水田土壌の温室効果ガス排出を削減し炭素配分を変化させる (AI 翻訳)
Jerickson Manuel Dela Dela Cruz, Cheng-Hsien Lin, Shan-Li Wang, Chang-Sheng Wang, Yu-Ting Liu, Kuo-Chen Yeh, Yu-Yu Kung
🤖 gxceed AI 要約
日本語
脆性イネわらと間断灌漑（AWD）の組み合わせが、水田からの温室効果ガス排出を大幅に削減しつつ土壌炭素貯留を維持できることを150日間のミクロコスム実験で実証。非脆性わらと比較して正味GHG排出をCF下で28.4%、AWD下で39.6%削減し、土壌炭素量も約27-30%増加。農業残渣管理の新たな戦略を示す。
English
A 150-day microcosm study demonstrates that combining brittle rice straw with alternate wetting and drying (AWD) reduces net greenhouse gas emissions by up to 39.6% compared to non-brittle straw, while maintaining or enhancing soil carbon stocks (27-30% increase). This offers a promising residue management strategy for intensive rice cultivation, balancing emission reduction and carbon sequestration.
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
日本の水田農業は世界有数のメタン排出源であり、SSBJやカーボンニュートラル政策の下で農業分野の排出削減が急務。本研究成果は、わらすき込みと水管理の最適化によるGHG削減と炭素貯留の両立可能性を示し、J-クレジット制度や農業由来排出削減策の設計に示唆を与える。
In the global GX context
This study provides empirical evidence on how residue management and water regimes can reduce agricultural GHG emissions, relevant to global frameworks like the Global Methane Pledge and national climate commitments. It offers actionable insights for sustainable rice intensification, aligning with climate-smart agriculture goals and carbon farming initiatives.
👥 読者別の含意
🔬研究者:Provides experimental data on the interaction of straw type and water management, useful for modeling GHG emissions and carbon dynamics in paddy soils.
🏢実務担当者:Offers a practical residue management strategy (brittle straw + AWD) that can reduce emissions and maintain soil health, applicable to rice farming operations.
🏛政策担当者:Supports policies promoting alternate wetting and drying and improved straw varieties to mitigate agricultural GHG emissions, relevant to national climate targets.
📄 Abstract（原文）
Rice (Oryza sativa L.) straw-return can improve soil carbon (C) sequestration, but its adoption in intensive rice systems is limited by short fallow periods (< 30 days), which likely lead to incomplete straw decomposition and increase methane emissions under continuous flooding (CF). Brittle rice straw, characterized by lower recalcitrant fiber content and rapid decomposition, may overcome this constraint; however, its environmental performance under alternate wetting and drying (AWD) remains unclear, such as broader C allocation. This 150-day microcosm study evaluated the interaction of straw type (brittle vs. non-brittle) and water management (CF vs. AWD) on greenhouse gas (GHG) emissions, dissolved C production, soil C storage, and aggregate formation in two contrasting paddy soils (sandy loam vs. silty clay loam). Compared with non-brittle straw, brittle straw returns reduced net GHG emissions by approximately 28.4% under CF and 39.6% under AWD. The combination of brittle straw with AWD produced the lowest net GHG emissions (0.61 kg CO2-eq m−2), indicating that intermittent oxygen input effectively mitigated the early decomposition-related emission risk. Brittle straw also increased the concentrations of dissolved inorganic C by 14.2% and nitrate by 64.3% under AWD, suggesting enhanced mineralization and potential inorganic C stabilization. Regardless of straw type, straw return improved soil C stocks by 27.3% in sandy loam and 29.6% in silty clay loam, while also promoting macroaggregate formation. Overall, this study demonstrated that coupling brittle rice straw with AWD can reduce GHG emissions while maintaining soil C benefits, offering a promising residue management strategy for intensive rice cultivation.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.3390/agronomy16111035first seen 2026-05-25 05:33:28 · last seen 2026-06-06 05:34:42
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