Microplastics and Co-Occurring Nitrogen Synergistically Accelerate Blue Carbon Loss
マイクロプラスチックと共存する窒素がブルーカーボン損失を相乗的に促進する (AI 翻訳)
Md Abu Noman, Tanveer M. Adyel, Damien L. Callahan, Ding He, Peter I. Macreadie, Stacey M. Trevathan‐Tackett
🤖 gxceed AI 要約
日本語
本論文は、海洋のブルーカーボン生態系において、マイクロプラスチック（特にPLA）と窒素肥料の複合汚染が、土壌有機物の微生物分解を促進し、CO2排出を最大195%増加させることを実験的に示した。マルチオミクス解析により、分解プロセスに関わる微生物群と代謝経路を特定。ブルーカーボン貯留に新たな脅威を示唆。
English
Using controlled microcosms and multi-omics, this study demonstrates that polylactic acid (PLA) microplastics combined with nitrogen fertilizer synergistically increase CO2 emissions from seagrass soil by up to 195%, accelerating blue carbon loss. The degradation of PLA enriches sulfate-reducing and fermentative bacteria, while nitrogen promotes organic-matter-degrading taxa, reducing residual dissolved organic carbon. This highlights the need to jointly consider plastic and nitrogen pollution in coastal carbon stock assessments.
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
日本は豊富な沿岸生態系（藻場・干潟）を有し、ブルーカーボン生態系の保全は国策となっている。本知見は、産業排水や農業由来の窒素と海洋プラスチックごみが複合的に炭素吸収源機能を損なう可能性を示し、日本の沿岸管理や排出削減戦略に重要な示唆を与える。
In the global GX context
Globally, blue carbon ecosystems are increasingly recognized as critical natural climate solutions. This paper provides novel experimental evidence that microplastic pollution, particularly biodegradable plastics, and nitrogen runoff can undermine their carbon storage capacity. The findings inform risk assessments for carbon offset projects and coastal zone management under frameworks like IPCC guidelines and the UN Decade on Ecosystem Restoration.
👥 読者別の含意
🔬研究者:Provides mechanistic understanding of how microplastics and nitrogen interact to accelerate organic carbon mineralization in blue carbon soils, with implications for carbon cycle modeling.
🏢実務担当者:Coastal managers and carbon project developers should consider synergistic pollution effects when estimating carbon sequestration potential and designing restoration projects.
🏛政策担当者:Supports integrating plastic pollution and fertilizer regulation into coastal climate mitigation policies to protect blue carbon sinks.
📄 Abstract（原文）
Blue carbon ecosystems (BCEs)—including seagrass meadows, mangroves, and salt marshes—store vast amounts of organic carbon, yet their carbon sink function is increasingly threatened by hazardous microplastics and co-occurring nitrogen pollution. Here, we used a controlled microcosm experiment and multi-omics analysis (16S rRNA amplicon sequencing, Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, and Ultra-Performance Liquid Chromatography-Mass Spectrometry) to investigate how two common microplastics—polyethylene terephthalate (PET) and polylactic acid (PLA)—interact with nitrogen fertiliser (N-dominated fertiliser with co-delivered nutrients) to influence seagrass soil biogeochemistry. We showed that PLA combined with N-fertiliser increased CO₂ emissions from seagrass soil by 106% relative to nitrogen alone and by 195% compared to controls (p<0.01), while PET addition had negligible effects. PLA degradation released carboxylic acid and derivatives, supporting putative sulphate-reducing and fermentative bacteria, and increasing the formation of organic-oxygen compounds (e.g., disaccharides, o-glycosyl compounds). N-fertiliser addition further enriched putative organic matter-degrading microbial taxa, particularly Clostridia and Bacteroidia, and elevated microbial metabolic potential across pathways. Combined PLA and nitrogen treatments resulted in the lowest (–37% vs control) residual dissolved organic carbon concentrations, indicating accelerated carbon loss. These findings suggest that microplastics, especially PLA biopolymer, and nitrogen act as hazardous co-contaminants that enhance microbial mineralisation of soil organic matter, potentially weakening blue carbon storage. Plastic waste and fertiliser inputs should therefore be considered together in future risk assessments of coastal carbon stocks and in the development of strategies to safeguard blue carbon ecosystems.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.jhazmat.2026.142641first seen 2026-06-17 05:56:25 · last seen 2026-06-17 07:14:18
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