Long‐Term Fertilization Regulates Greenhouse Gas Emissions Through Soil Aggregate Carbon and Nitrogen in Paddy Fields
長期施肥が水田の土壌団粒炭素・窒素を介して温室効果ガス排出を調節する (AI 翻訳)
Yazhen Li, Haibin Li, Kailou Liu, Xuebo Zheng, Dandan Hu, Yan Wu, Huijie Song, Xiaolin Xu, Zhihua Hu
🤖 gxceed AI 要約
日本語
中国江西省の長期水田試験（1981年開始）で、有機物併用施肥（NPKM）が収量を最大化しつつ、温室効果ガス強度（GHGI）を低減することを示した。NPKMは大団粒構造を強化し、土壌炭素・窒素の分布を改善することで、メタン・亜酸化窒素排出の増加を収量増で相殺した。GHGIは微団粒の窒素・炭素に敏感で、有機無機併用が持続的農業に有効と結論。
English
Based on a long-term paddy experiment (since 1981) in Jiangxi, China, this study shows that integrated organic-inorganic fertilization (NPKM) maximizes rice yield while reducing greenhouse gas intensity (GHGI). NPKM improved macroaggregate structure and soil carbon/nitrogen distribution, offsetting increased CH4 and N2O fluxes with higher yields. GHGI was most sensitive to nitrogen and carbon in microaggregates, supporting integrated fertilization for sustainable agriculture.
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
日本の水田農業やJクレジット制度におけるGHG削減策として、有機物施用の効果を裏付けるエビデンスとなる。ただし、中国の土壌・気候条件に基づくため、日本への適用には地域適応の検討が必要。
In the global GX context
This study provides empirical evidence on how organic amendments can reduce GHG intensity in rice paddies, relevant to global agricultural GHG mitigation strategies and carbon farming initiatives. It underscores the importance of soil aggregate dynamics in managing emissions, which could inform climate-smart agriculture policies and carbon credit methodologies.
👥 読者別の含意
🔬研究者:Provides insights into soil aggregate carbon-nitrogen interactions affecting GHG emissions, useful for modeling and mitigation research.
🏢実務担当者:Suggests that integrated organic-inorganic fertilization can improve yield while lowering emission intensity, relevant for sustainable farming practices.
🏛政策担当者:Offers evidence for promoting organic amendments in rice paddies as a climate mitigation measure, potentially informing agricultural climate policies.
📄 Abstract（原文）
ABSTRACT Background and aim Rice paddies are major agricultural sources of greenhouse gases (GHG), yet it remains unclear whether regulating carbon (C) and nitrogen (N) distribution among soil aggregate fractions can mitigate emission intensity. Methods Based on a long‐term paddy‐field experiment established in 1981 in Jiangxi, China, we examined four fertilization regimes: CK (unfertilized control), NPK (mineral nitrogen, phosphorus, and potassium), DNPK (double‐rate NPK), and NPKM (NPK combined with seasonal organic amendments). Soil‐surface fluxes of methane (CH 4 ), nitrous oxide (N 2 O), and carbon dioxide (CO 2 ) were measured using static chambers, and 0–20 cm soil was fractionated into >2 mm, 0.25–2 mm, 0.053–0.25 mm, and <0.053 mm aggregates to quantify soil organic carbon (OC) and total nitrogen (TN). Global warming potential (GWP), greenhouse gas intensity (GHGI), and C/N ratio were then calculated. Results Fertilization significantly increased grain yield, with NPKM producing the highest yield (16,777.68 kg ha −1 ), followed by DNPK. DNPK generated the greatest CO 2 emissions and the highest GWP (≈6524 kg CO 2 ‐eq ha −1 ). Although DNPK and NPKM increased absolute CH 4 and N 2 O fluxes, NPKM maintained a comparatively low GHGI because of its larger yield response. NPKM increased the proportion of >2 mm macroaggregates and enhanced OC (29.19%–167.15%) and TN (42.24%–137.57%) across multiple fractions, whereas DNPK primarily increased OC in the 0.053–0.25 mm fraction. Redundancy analysis revealed that GWP was mainly driven by C/N in 0.25–2 mm aggregates, TN in >2 mm aggregates, and OC in <0.053 mm aggregates. GHGI was more sensitive to TN and OC in the 0.053–0.25 mm fraction and OC in the 0.25–2 mm fraction. Conclusion These findings suggest that long‐term integrated organic–inorganic fertilization enhances macroaggregate structure while strengthening meso‐microaggregate buffering capacity and C with N coordination. This dual mechanism sustains higher rice yields while reducing GHGI.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1002/jpln.70105first seen 2026-08-13 05:55:50
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