NitrogenAvailability Modulates Root-Mediated SoilOrganic Carbon Formation
窒素利用可能性が根媒介性土壌有機炭素形成を調節する (AI 翻訳)
Xiaodong Wang, Lei Wang, Yarui Xin, Ying Zhang
🤖 gxceed AI 要約
日本語
本研究は、わら施用下での根の成長が総土壌有機炭素（SOC）蓄積に有意な影響を与えないが、安定SOCプールへの割り当てを促進することを示した。低窒素土壌では根がわら由来炭素の閉塞態粒子状有機炭素（oPOC）や鉱物結合有機炭素（MAOC）への移行を促進し安定SOC形成を促進する。高窒素土壌では根がわら由来炭素の安定SOCへの寄与を減らすが、根滲出物由来炭素がoPOCとMAOCに取り込まれることで相殺される。微生物の炭素・窒素要求と資源利用可能性の化学量論的不均衡がこれらのパターンを駆動する。
English
The study reveals that root ingrowth does not significantly alter total SOC accumulation under straw incorporation but facilitates allocation to stable SOC pools. In low-nitrogen soils, roots promote stable SOC formation by transferring straw-derived carbon to occluded particulate and mineral-associated fractions. In high-nitrogen soils, roots reduce straw-derived carbon contribution to stable SOC but rhizodeposits may offset. These patterns are driven by stoichiometric imbalance between microbial C:N demand and resource availability.
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
本論文は土壌炭素隔離のメカニズムを解明しており、日本の農地における炭素貯留効果の評価（J-クレジット制度など）に示唆を与える可能性がある。特に窒素管理と炭素蓄積の関係は、日本の稲作などにも応用が期待される。
In the global GX context
This research advances mechanistic understanding of root-mediated SOC formation, crucial for improving carbon models and designing effective soil carbon sequestration practices globally. The findings highlight the role of nitrogen management in modulating stabilization pathways, relevant for both carbon accounting and climate mitigation strategies under frameworks like the Global Soil Partnership.
👥 読者別の含意
🔬研究者:This paper provides mechanistic insights into how nitrogen availability modulates root effects on SOC formation, useful for researchers working on soil carbon dynamics and climate mitigation.
🏢実務担当者:Farmers and land managers can learn that nitrogen management impacts the effectiveness of straw incorporation for carbon sequestration, informing site-specific practices.
🏛政策担当者:This informs agricultural policy on nitrogen fertilizer management and residue incorporation to enhance soil carbon sequestration, relevant for national climate targets.
📄 Abstract（原文）
Living roots influence the formation of soil organic carbon (SOC) under straw incorporation, but the mechanisms underlying this process remain unclear. To elucidate these effects, we traced the fate of isotopically labeled maize straw into SOC via soil cores that were incubated in a soybean field. Our findings suggest that root ingrowth does not significantly affect the total SOC accumulation under straw incorporation but instead facilitates the allocation of SOC into stable SOC pools. However, the formation of stable SOC differs fundamentally between low-nitrogen (LN) and high-nitrogen (HN) soils. In LN soils, root ingrowth promotes the accumulation of stable SOC by promoting the transfer of straw-derived carbon into occluded particulate organic carbon (oPOC) and mineral-associated organic carbon (MAOC). In contrast, root ingrowth reduces the contribution of straw-derived C to stable SOC in HN soils, but this reduction may be offset by the incorporation of rhizodeposited C into oPOC and MAOC. Further research indicates that these different patterns are driven by a stoichiometric imbalance between the microbial demand for carbon and nitrogen and their resource availability. These findings provide mechanistic insights into how the presence of roots under straw incorporation influences SOC formation, deepening our understanding of root-mediated SOC sequestration.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.est.6c00482first seen 2026-07-30 05:38:32
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