微生物によるリグニンのメタン分解が中国の塩性湿地の純ブルーカーボン便益を減少させる
Microbial Decomposition of Lignin to Methane Reduces Net Blue Carbon Benefit Across China's Saltmarshes (原題)
Leilei Xiao, Chuancheng Fu, Isaac R. Santos, Carlos M. Duarte, Jian Liu, Lifeng Zhou, Meng Zhou, Run Dang, Jinkuo Lin, Kai Xiao, Yongming Luo, Guangxuan Han
🤖 gxceed AI 要約
日本語
中国の塩性湿地116地点のインキュベーション測定とメタゲノム解析により、塩性湿地がマングローブや海草藻場よりメタン生成ポテンシャルが高いことを示した。リグニン分解がメチロトローフ経路を介してメタン生成を促進し、植物由来炭素の貯留が実質的なブルーカーボン便益を減少させる経路を解明。従来のブルーカーボン算定枠組みに疑問を投げかける。
English
Integrating incubation measurements from 116 sites and metagenomics, this study reveals that Chinese saltmarshes are methane production hotspots compared to mangroves and seagrass. Lignin decomposition fuels methanogenesis via methylotrophic pathways, reducing net blue carbon benefit. The findings challenge current blue carbon accounting frameworks by showing plant-derived carbon is less stable than assumed.
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
日本ではブルーカーボン生態系の保全が注目されており、本研究成果は日本の塩性湿地や干潟の炭素貯留評価においてメタン排出を考慮する必要性を示唆する。Jブルークレジット制度の算定方法にも影響を与える可能性がある。
In the global GX context
Globally, blue carbon accounting frameworks (e.g., IPCC guidelines) may need to incorporate methane emissions from saltmarshes to avoid overestimating climate benefits. This study provides mechanistic evidence that could refine carbon credit methodologies and inform coastal wetland management policies.
👥 読者別の含意
🔬研究者:Provides mechanistic insights into methane production in blue carbon ecosystems, useful for refining carbon cycle models.
🏢実務担当者:Highlights the need to account for methane emissions in blue carbon projects to ensure accurate carbon credit claims.
🏛政策担当者:Suggests that blue carbon policies should consider methane emissions to avoid overestimating mitigation benefits.
📄 Abstract（原文）
ABSTRACT CH 4 emissions from mangrove, saltmarsh, and seagrass ecosystems partially offset carbon sequestration, potentially diminishing the climate mitigation capacity of these blue carbon habitats. However, a mechanistic understanding of the processes governing CH 4 production potential across large spatial scales remains limited. By integrating incubation‐based measurements from 116 sites, we reveal significant ecosystem‐specific differences in CH 4 production potential, with saltmarshes emerging as CH 4 production hotspot relative to mangroves and seagrass meadows. Using an integrated analytical approach encompassing more than 30 environmental, biogeochemical, and microbial parameters, we demonstrate that CH 4 production potential converges on sediment organic carbon availability, particularly plant‐derived carbon, as a key regulatory axis. Additionally, metagenome‐assembled genomes (MAGs) recovered from saltmarshes show a functional bias toward lignin degradation, thereby fueling downstream CH 4 production via methylotrophic pathways. Lignin‐addition and stable carbon isotope experiments further provide supportive evidence that lignin decomposition enhances Chinese saltmarsh CH 4 production potential, revealing a pathway that may reduce net blue carbon benefit. Together, these findings underscore that saltmarsh plant‐derived lignin is less stable than conventionally assumed, as microbial processing redirects stored carbon toward CH 4 production, challenging current blue carbon accounting frameworks at a continental scale within China.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1111/gcb.71059first seen 2026-08-19 04:45:15
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