下層土と表層土への稲わら施用は微生物炭素配分を変え、炭素隔離と排出削減を促進する
Subsoil versus Topsoil Straw Addition Shifts Microbial Carbon Allocation for Enhanced Carbon Sequestration and Emission Mitigation (原題)
Yalin Yu, Li Li, Jinkang Yang, Xinyue Wang, Yixuan Luo, Yanling Li, Awais Shakoor, Ahmad Latif Virk, 杨海水 YANG Haishui, Feng-Min Li, Zheng‐Rong Kan
🤖 gxceed AI 要約
日本語
水田において、稲わらを下層土（20cm以深）に施用すると表層施用より土壌有機炭素が2.2%増加し、鉱物結合有機炭素の形成が促進された。13C標識培養により微生物がわら炭素をアミノ糖へ変換する経路が示され、CH4排出は15.3%減少した。全球メタ解析と機械学習モデルは、深耕施用が将来気候下で炭素排出を半減し得ることを示す。
English
In rice paddies, incorporating straw into subsoil (>20 cm) raised soil organic carbon 2.2% over topsoil addition, mainly via mineral-associated organic carbon formation. 13C-labeled incubation showed microbes convert straw carbon into amino sugars, and subsoil addition cut CH4 emissions 15.3%. A global meta-analysis and machine-learning models suggest deeper incorporation could halve carbon emissions under future climate.
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
農業由来の炭素隔離・排出削減策として、J-クレジットの水田メタン削減や農林業分野のGX推進に関わる知見。ただし企業開示やSSBJ対応への直接的示唆は限定的。
In the global GX context
Adds empirical evidence on soil-based carbon removal and methane mitigation relevant to agriculture-sector transition pathways and emerging soil-carbon crediting debates, though it does not directly address TCFD/ISSB disclosure.
👥 読者別の含意
🔬研究者:下層土への有機物投入がMAOC形成とCH4酸化を通じ炭素隔離と排出削減を両立する機構的証拠を提供する。
🏢実務担当者:農業・食品関連企業がサプライチェーン上流の土壌炭素・メタン削減策を検討する際の参考になる。
🏛政策担当者:水田管理や農業炭素クレジット制度設計において深耕施用を選択肢として検討する根拠になり得る。
📄 Abstract（原文）
Abstract Subsoils (>20 cm) represent an underutilized sink for soil organic carbon (SOC) sequestration because C inputs in subsoil are typically limited. To clarify how organic inputs regulate subsoil SOC accrual and C emissions in rice paddies, we combined a 2-year field experiment with 13C-labeled straw incubation and validated the results with a global meta-analysis. Results showed that compared with no addition and topsoil straw addition, subsoil straw addition increased SOC stocks by 10.5% and 2.2%, respectively, primarily via enhanced mineral-associated organic C (MAOC) formation at 0–30 cm. The 270-day incubation revealed that subsoil addition accelerated microbial conversion of straw C into amino sugars, evidenced by 13C-phospholipid fatty acids, promoting MAOC formation. Relative to topsoil addition, subsoil addition reduced CH4 emissions by 15.3%, driven by improved root growth and enhanced CH4 oxidation, and decreased CO2 emissions by lowering topsoil C availability and peroxidase activity. Meta-analysis confirmed that C emissions decrease progressively with increasing incorporation depth, and machine-learning models indicate that deeper incorporation (>20 cm) mitigates global C emissions by half under future climate change. Overall, compared with topsoil addition, subsoil addition represents a win–win strategy that simultaneously enhances SOC sequestration and reduces C emissions, with potential applicability beyond paddy systems.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.est.6c03165first seen 2026-10-30 05:01:41 · last seen 2026-11-06 04:56:59
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