Nitrogen-Fixing Trees Shift Soil Organic Carbon Toward Mineral-Associated Stability by Enhancing Microbial-Derived Carbon in Subtropical Plantations
窒素固定樹木の混植が微生物由来炭素を増加させ、亜熱帯人工林の土壌有機炭素を鉱物結合態へとシフトさせる (AI 翻訳)
Hongwei Bai, Yong-Fu He, Qing Liu, Junhao Chen, Wending Tan, Mei Yang, Xianyu Yao
🤖 gxceed AI 要約
日本語
中国亜熱帯のユーカリ純林と窒素固定樹（Erythrophleum fordii）混植林を比較し、混植が土壌有機炭素（SOC）を22.41%増加させ、より安定な鉱物結合態有機炭素（MAOC）を表層で28.39%増加させることを実証。真菌由来炭素（FNC）が51.20%増加し、微生物由来炭素がMAOC形成に直接寄与することを構造方程式モデリングで示した。混植が炭素隔離の安定性を高める微生物メカニズムを提供する。
English
Comparing pure Eucalyptus plantations with mixed plantations containing nitrogen-fixing Erythrophleum fordii in subtropical China, this study shows that mixing increases total soil organic carbon (SOC) by 22.41% and shifts carbon toward more stable mineral-associated organic carbon (MAOC), which rose by 28.39% in the surface layer. Fungal-derived carbon increased by 51.20%, and structural equation modeling revealed that microbial-derived carbon directly contributes to MAOC formation. This provides field-based evidence for a microbial mechanism enhancing carbon stability in mixed-species plantations.
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
日本では森林吸収源の強化がカーボンニュートラル戦略に位置づけられており、J-クレジット制度での森林管理の評価にも示唆を与える。ただし、本研究成果は中国の亜熱帯林に基づくため、日本の温帯林への適用には注意が必要。
In the global GX context
This study contributes to global understanding of how mixed-species plantations can enhance long-term carbon sequestration stability, relevant to nature-based solutions and carbon accounting frameworks. It provides mechanistic evidence that could inform IPCC guidelines and national greenhouse gas inventories for forest management.
👥 読者別の含意
🔬研究者:Provides a mechanistic pathway (fungal-derived carbon to MAOC) for evaluating carbon stability in mixed plantations, useful for biogeochemical modeling.
🏢実務担当者:Offers evidence that mixing N-fixing trees with Eucalyptus can enhance soil carbon stability, relevant for forest management and carbon credit projects.
🏛政策担当者:Supports policies promoting mixed-species plantations as a climate mitigation strategy, with implications for carbon accounting and land-use planning.
📄 Abstract（原文）
Introducing nitrogen (N)-fixing trees into plantations is a promising strategy to increase soil organic carbon (SOC) storage. However, whether this practice enhances SOC stability, a key determinant of long-term carbon sequestration, and through which specific microbial pathways, remains poorly understood. Here, we compared pure Eucalyptus plantations with mixed plantations containing the N-fixing tree Erythrophleum fordii (E. fordii) in subtropical China by measuring SOC fractions, microbial communities, extracellular enzymes, and microbial-derived carbon (MNC) content. After five years of plantation establishment, mixed plantations significantly increased total SOC by 22.41% compared to pure eucalypt stands. More importantly, this increase was accompanied by a pronounced shift in the carbon pool toward more stable mineral-associated organic carbon (MAOC), which increased by 28.39% in the surface layer. This increase was associated with microbial community restructuring characterized by a greater fungal contribution. The fungal-derived carbon (FNC) rose by 51.20%, and structural equation modeling showed that MNC contributed directly to MAOC formation, a stronger effect than the indirect enzyme-mediated pathway. Our findings provide field-based evidence that mixing Eucalyptus with N-fixing trees enhances SOC stability, primarily through the association between FNC accumulation and MAOC formation. This microbial mechanism provides a process-based perspective for evaluating mixed-species N-fixing tree plantations as a carbon-friendly management strategy in subtropical forestry.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/plants15152367first seen 2026-08-02 05:38:29
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