土壌炭素飽和と排出トレードオフが挑む直接秸秆還元の長期持続性
Long‐Term Sustainability of Direct Straw Return Challenged by Soil Carbon Saturation and Emission Trade‐Offs (原題)
Junzhuo Liu, Lina Gong, O. Oenema, Yonghong Wu
🤖 gxceed AI 要約
日本語
中国の375研究を統合し、直接秸秆還元（DSR）の土壌有機炭素・収量・純炭素便益（NCB）への長期影響を評価。SOCと収量の増加は頭打ちとなり、全国規模のNCBはGHG排出により最終的に負に転じる。最適トレードオフ閾値は地域で1.4〜5.5年、水田地域では1.6〜3.5年の期限が必要と示す。
English
Synthesizing 375 Chinese studies, this paper evaluates long-term impacts of direct straw return (DSR) on soil organic carbon, yield, and net carbon benefit (NCB). SOC gains and yield increases plateau, and national NCB eventually turns negative due to persistent GHG emissions. Optimal trade-off windows vary regionally (1.4–5.5 years; 1.6–3.5 years for rice systems), offering a blueprint for region-specific residue management.
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
日本でも稲作・畑作の残渣還元は炭素貯留策として注目されるが、本論文は「炭素吸収源の一時性」を定量化しており、J-クレジットや農業由来排出削減の制度設計・モニタリング期間設定に示唆を与える。
In the global GX context
While focused on China, the finding that agricultural carbon sinks are transient and region-dependent is directly relevant to global soil-carbon crediting debates (e.g., voluntary carbon markets, EU carbon farming) and to how disclosure frameworks should treat temporary removals.
👥 読者別の含意
🔬研究者:土壌炭素飽和とGHGトレードオフの動態を地域別に定量化した点が、炭素吸収源の永続性研究に有用。
🏢実務担当者:農業・食品企業は残渣還元の炭素クレジット活用時に、地域別の有効期間と純便益の頭打ちを考慮すべき。
🏛政策担当者:農業炭素貯留を政策・クレジット化する際、地域別の時間的制約とモニタリング期間の設定が重要。
📄 Abstract（原文）
ABSTRACT Sustainable residue management underpins agricultural productivity and climate resilience. Direct straw return (DSR) is widely adopted to enhance soil organic carbon (SOC) and fertility, yet its long‐term sustainability remains uncertain due to trade‐offs between C sequestration and greenhouse gas (GHG) emissions. By synthesizing 375 studies across China, we evaluate DSR's long‐term impacts on SOC, crop yield, and net carbon benefits (NCB) and propose an integrated strategy (DSR‐C) combining optimized tillage, nitrogen reduction, and microbial inoculation. Model‐simulated dynamics show that SOC accumulation and yield gains plateau over time, whereas the national‐scale NCB eventually turns negative due to persistent GHG emissions. Pareto optimization reveals an optimal trade‐off threshold (Knee point) at 1.4–5.5 years across regions. Significant regional heterogeneity governs these dynamics: upland wheat/maize systems sustain positive NCB for 6.4 to over 50 years, whereas rice‐dominated regions require temporal limits (1.6–3.5 years) to prevent transitioning from a net carbon sink to a net carbon source. Beyond these critical windows, yield increments stagnate while ecological trade‐offs intensify. By highlighting the dynamic, transient nature of agricultural carbon sinks, these findings provide a quantitative blueprint for region‐specific adaptive residue management, offering broad global relevance for scaling climate‐smart agriculture and accelerating decarbonization under future global change.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1111/gcb.71120first seen 2026-09-24 04:39:56
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