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土壌有機炭素の軌跡を追跡する：米国中西部の長期不耕起体系における炭素モニタリングには深度と画分が重要

Tracking soil organic carbon trajectories: depth and fractions matter for carbon monitoring in US midwestern long-term no-tilled systems (原題)

Katherine Naasko, Alexa Smychkovich, Swarnali Mahmood, Yang Lin, Jocelyn M. Lavallee, S. Carolina Córdova, Marty R. Schmer, Christine D. Sprunger

Biogeochemistry📚 査読済 / ジャーナル2026-10-20#炭素会計Origin: US対象セクター: agriculture
DOI: 10.1007/s10533-026-01382-4
原典: https://doi.org/10.1007/s10533-026-01382-4

🤖 gxceed AI 要約

日本語

米国中西部の3つの長期試験の保管土壌を用い、土壌有機炭素（SOC）の経時変化を深度別・画分別（POC、MAOC、POXC、MINC）に分析した。残渣保持は表層SOCを増加させ、POXCがSOCの増減を最もよく反映した。表層のみの測定はSOC動態を誤って評価しうるため、複数画分・深度での長期モニタリングが不可欠と結論づけた。

English

Using archived soils from three US Midwest long-term trials, the study tracked soil organic carbon (SOC) change across depth and fractions (POC, MAOC, POXC, MINC). Residue retention raised surface SOC, and POXC most reliably tracked SOC gains and losses. Surface-only sampling can misrepresent SOC dynamics, so multi-fraction, multi-depth long-term monitoring is essential.

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

Scope 3や農業由来クレジット、土壌炭素貯留を謳うプログラムの測定・報告手法に関わる知見。日本でも農地炭素貯留やJ-クレジットの土壌炭素分野のMRV設計を検討する際に参考になる。

In the global GX context

Relevant to soil-carbon MRV underpinning agricultural carbon credits and Scope 3 land-sector accounting. It cautions that surface-only sampling can misstate SOC change, informing verification standards for carbon farming programs globally.

👥 読者別の含意

🔬研究者:SOC画分・深度別の長期軌跡データとPOXCの指標妥当性の実証を提供する。

🏢実務担当者:土壌炭素プログラムや農業サプライチェーンの炭素測定設計で、深度・画分を考慮すべき根拠となる。

🏛政策担当者:土壌炭素クレジットやMRV制度の測定要件を表層限定にしない重要性を示す。

📄 Abstract（原文）

Understanding how soil organic carbon (SOC) changes over time and depth in agricultural systems is critical for informing soil health stewardship and carbon monitoring in SOC-focused programs. Yet, knowledge is limited on how SOC trajectories vary across depth and among different fractions and soil health metrics—particulate organic carbon (POC), mineral-associated organic carbon (MAOC), permanganate oxidizable carbon (POXC), and mineralizable carbon (MINC). We analyzed archived soils from three long-term Midwest trials: two in Nebraska comparing residue removal and retention in continuous corn over 10 and 19 years, and one at the Great Lakes Bioenergy Research Center (GLBRC) comparing continuous corn and perennial switchgrass after 9 years. At the 19-year Nebraska experiment, increasing plant inputs through residue retention enhanced SOC, particularly in surface soils. At both Nebraska experiments, POXC more closely tracked total SOC than MAOC, POC, or MINC. At GLBRC, surface-level SOC losses occurred under corn, whereas switchgrass exhibited whole-profile SOC losses. Across sites, MAOC showed minimal change, MINC often declined, and POC responses were variable, while POXC was the most reliable indicator of SOC gains and losses. Extending sampling beyond surface soils revealed larger changes, highlighting that surface-focused measurements alone can misrepresent SOC dynamics. Overall, long-term monitoring across multiple SOC fractions and depths is essential for accurately assessing SOC change under different management practices. Our findings provide actionable insights for regenerative agroecosystems and highlight the potential use of POXC as a soil health metric for informing management decisions and SOC-focused programs.

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