有機肥料の投入は熱帯草地の土壌炭素貯留を増加させる一方、在来炭素の損失を引き起こす
Organic fertilizer inputs enhance soil carbon storage while triggering native carbon losses in tropical grasslands (原題)
Floriane Jamoteau, Isabelle Basile-Doeslch, Christine Hatté, Baptiste Hulin, Adrien Duvivier, Emmanuel Tillard, Antoine Versini
🤖 gxceed AI 要約
日本語
熱帯草地における15年間の有機肥料施用が、土壌炭素貯留と在来有機物の安定性に与える影響を、同位体トレーサーを用いて評価した。有機肥料由来の炭素は主に粒状有機炭素として蓄積するが、鉱物結合有機炭素の分解を促進し、土壌タイプによっては炭素貯留の純増が相殺される可能性が示された。施肥戦略は土壌・気候条件に応じて調整すべきである。
English
This study evaluates the impact of 15 years of organic fertilizer application on soil carbon storage and native organic matter stability in tropical grasslands using isotopic tracers. Organic fertilizer-derived carbon accumulates mainly as particulate organic carbon, but can stimulate decomposition of mineral-associated organic carbon, potentially offsetting net gains depending on soil type. Fertilization strategies should be tailored to soil-climate conditions.
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
日本の農業分野では、土壌炭素貯留はカーボンフットプリントやJ-クレジット制度と関連するが、本論文は熱帯土壌に焦点を当てており、直接的な政策連動は限定的。ただし、土壌炭素動態の理解は国内の炭素貯留施策の参考になる。
In the global GX context
Globally, soil carbon sequestration is a key nature-based solution for climate mitigation, and this paper provides nuanced evidence that organic amendments may not always yield net carbon gains, informing carbon accounting and land management policies under the Paris Agreement.
👥 読者別の含意
🔬研究者:Provides empirical evidence on the trade-offs between organic fertilizer carbon inputs and native soil carbon stability, relevant for carbon cycle modeling.
🏢実務担当者:Informs agricultural practices regarding organic fertilizer use, highlighting the need to consider soil type to maximize carbon sequestration.
🏛政策担当者:Suggests that soil carbon sequestration policies should account for soil-specific responses to organic amendments to avoid overestimating climate benefits.
📄 Abstract（原文）
Organic fertilizers are widely promoted as a sustainable solution to enhance soil C storage and nutrient recycling. Their capacity to increase soil organic matter is well documented, yet little is known regarding their long-term influence on native soil organic matter stability and turnover. This study investigated the fate of organic fertilizer-derived C (OF-C) and its interaction with native C pools after 15 years of continuous bovine manure compost and liquid manure application in two contrasting tropical grassland soils: an Arenosol and an Andosol. Using size fractionation, natural abundance isotopic tracers (δ 13 C and 14 C) and combined C × δ 13 C× 14 C equations, we quantified the contribution of organic fertilizers to particulate organic C (POC) and mineral-associated organic C (MAOC), while assessing their effects on native C stocks. Results showed that organic fertilizers increased soil C stocks in the top 20 cm (+0.11 to +0.19 kgC.m −2 .yr −1 ), mainly through POC accumulation, with some contributions to the MAOC pool. However, this gain appeared to be partially offset by native MAOC destabilization, with estimated losses reaching up to 40% of compost-derived C gains in the Andosol, 10% in the Arenosol, and 25% of slurry-derived C gains in the Arenosol. These losses appeared to be more influenced by soil-climate conditions than by the amendment type. In the Arenosol, the MAOC balance remained close to neutral, with formation offsetting losses. In contrast, net losses were noted the Andosol, alongside a decrease in poorly-crystalline minerals with high affinity for organic matter, thus potentially limiting MAOC rebuilding. These patterns suggest that fertilization strategies should be tailored to soil-climate conditions. In reactive–mineral soils such as Andosols, repeated organic inputs may limit long–term C storage unless carefully managed, while in soils with low-reactive mineral soils, e.g. Arenosols, organic amendments tend to enhance soil C accumulation without jeopardizing the long-term stability of the MAOC pool.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.geoderma.2026.117973first seen 2026-08-22 05:00:49
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