Plant carbon inputs drive the stratification of soil organic carbon, microbial biomass and mineralizable nitrogen after reducing soil tillage
植物由来の炭素投入が耕起削減後の土壌有機炭素、微生物バイオマス、無機化窒素の層別化を駆動する (AI 翻訳)
Bruno Mary, Fabien Ferchaud, Hugues Clivot, Hubert Boizard, Bernard Nicolardot
🤖 gxceed AI 要約
日本語
本論文は、浅い耕起が土壌有機炭素（SOC）と全窒素（STN）の貯留量に与える影響を7.5年間の圃場実験で調査した。浅耕は表層（0-6cm）でSOCを増加させるが下層（20-30cm）で減少させ、プロファイル全体では有意差はなかった。変化率は作物残渣由来の炭素投入量と強く相関し、耕起強度とは無関係であった。これは、減耕起による物理的保護仮説を覆す結果である。
English
This study examines the effect of shallow tillage on soil organic carbon (SOC) and total nitrogen (STN) stocks over 7.5 years in a field experiment. Shallow tillage increased SOC in the top layer (0-6 cm) but decreased it in deeper layers (20-30 cm), with no net change over the full profile. The rates of change were strongly correlated with estimated plant carbon inputs, not with tillage intensity, challenging the physical protection hypothesis of reduced tillage.
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
日本の農業では、水田や畑作における耕起低減が炭素貯留に与える影響が注目されている。本結果は、表層への炭素集積が下層での減少を伴う可能性を示唆し、炭素貯留の正味効果を評価する際には深さ別の変化を考慮すべきことを示す。
In the global GX context
This paper contributes to the global debate on soil carbon sequestration under conservation agriculture. It suggests that apparent carbon gains in surface layers under reduced tillage may be offset by losses in deeper layers, emphasizing the need for full-profile accounting when evaluating climate mitigation potential of tillage practices.
👥 読者別の含意
🔬研究者:Soil scientists should note that plant carbon inputs, not tillage intensity per se, drive stratification of organic matter, questioning the physical protection mechanism.
🏛政策担当者:Agricultural policymakers should be cautious about assuming reduced tillage always leads to net soil carbon sequestration; consider full-profile assessment and crop residue management.
📄 Abstract（原文）
The impact of tillage on the stocks of soil organic carbon (SOC), soil total nitrogen (STN), microbial biomass carbon (MBC), and on nitrogen mineralization rates (NMR) remains a subject of debate. In a field experiment with loamy soil and a temperate climate, we compared three cropping systems and two tillage treatments (conventional and shallow tillage). Bulk density, SOC, STN and MBC were measured in three soil layers (0–6, 6–20 and 20–30 cm) and at four dates (1.5, 3.5, 5.5 and 7.5 years after the shallow tillage was implemented). NMR was measured in laboratory incubations at two dates (1.5 and 7.5 years). SOC stocks under shallow tillage increased at a rate of 0.25 t ha −1 yr −1 in the upper soil layer, but decreased at a rate of −0.20 t ha −1 yr −1 in the deeper layer, whereas stocks under conventional tillage remained almost stable in the three layers. The same pattern was observed for STN and MBC. Similarly, NMR under shallow tillage increased significantly in the upper layer (+35%), while decreasing in the deeper layer (−25%). However, neither cropping systems nor tillage treatments affected the total SOC, STN and MBC stocks or NMR when integrated over the entire profile (∼0–30 cm). The rates of change in SOC, STN, MBC and NMR in the three soil layers were highly correlated with estimated plant carbon inputs based on crop yields, but not with tillage intensity. These results challenge the hypothesis of a higher physical protection of the soil organic matter with reduced tillage.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.geoderma.2026.117874first seen 2026-06-18 05:42:18
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