Declines in organic matter persistence with increased soil carbon
土壌炭素の増加に伴う有機物持続性の低下 (AI 翻訳)
Guang Zhao, Chao Liang, Liu Z, Nan Cong, Z-Y Zheng, Edith Bai, Juntao Zhu, Bo Zhao, Y C Zhu, Mengke Cai, Xiaoqing Duan, Hui Wang, Jianbei Huang, Yangjian Zhang, Susan Trumbore
🤖 gxceed AI 要約
日本語
土壌有機物の持続性は気候変動フィードバックに重要だが、炭素含有量増加と持続性の関係は不明だった。本論文では、降水量勾配と全球データを用い、土壌有機炭素の増加に伴い、放射炭素年代が若くなり、持続性が低下することを示した。これは、炭素含有量が多い土壌ほど若く速い循環の炭素が支配的であることを意味し、植物炭素投入と微生物効率の重要性を強調する。
English
Soil organic matter persistence is crucial for carbon-climate feedbacks, but its relationship with increasing soil carbon is unclear. This study shows that as soil organic carbon increases, its persistence (measured by radiocarbon) declines at both local and global scales, indicating younger, faster-cycling carbon dominance. Microbial carbon use efficiency increases but does not enhance long-term stabilization. Results highlight the need for explicit representation of plant inputs and microbial processes in Earth system models.
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
日本の森林・農地の炭素貯留政策（J-クレジット、森林吸収源）にとって、土壌炭素の持続性メカニズムの理解は重要。本論文は、土壌炭素量が増えるほど若い炭素が優占し、長期貯留効果が限定的であることを示唆しており、炭素クレジットの永続性評価に示唆を与える。
In the global GX context
Globally, this paper informs nature-based climate solutions and carbon sequestration projects by showing that higher soil carbon does not imply longer persistence. It challenges assumptions that increasing SOC alone guarantees long-term storage, which is relevant for carbon offset accounting and Earth system model development.
👥 読者別の含意
🔬研究者:Provides empirical evidence that soil carbon persistence declines with increasing SOC, urging modelers to incorporate plant inputs and microbial CUE dynamics.
🏢実務担当者:Nature-based solution project developers should note that higher SOC may not equate to permanent carbon removal; monitoring of carbon age is advisable.
🏛政策担当者:Carbon crediting programs should consider soil carbon persistence metrics beyond total stock changes.
📄 Abstract（原文）
The persistence of soil organic matter (SOM) is critical for predicting carbon-climate feedbacks, yet how increasing soil organic carbon (SOC) relates to long-term SOM persistence across environmental gradients remains unclear. Soil radiocarbon, SOM physicochemical composition, and microbial carbon use efficiency (CUE) are analyzed along a precipitation-driven gradient integrated with global datasets. Here we show, as SOC content increases, its persistence as reflected by radiocarbon signatures declines at both the transect and global scales. This pattern indicates that higher SOC soils are increasingly dominated by younger, faster-cycling carbon rather than older, stabilized pools. Plant carbon inputs strongly predict SOM persistence and are associated with younger, less persistent SOC. While microbial CUE increases with SOC, higher CUE does not necessarily enhance long-term stabilization. Our findings suggest that SOC content alone provides limited insight into long-term soil carbon persistence and highlight the importance of explicitly representing plant carbon inputs and microbially mediated persistence in Earth system models.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1038/s41467-026-75185-4first seen 2026-07-17 05:11:49
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