Microplastics and co-occurring nitrogen synergistically accelerate blue carbon loss
MA Noman, TM Adyel, Damien L. Callahan, D He, PI Macreadie, SM Trevathan-Tackett
🤖 gxceed AI 要約
日本語
本論文は、マイクロプラスチック（特にPLA）と窒素肥料が共存すると、海草の土壌からCO2排出が最大106%増加し、有機炭素の分解が促進されることを示した。PLAの分解産物が硫酸還元菌等を増やし、窒素が有機物分解菌を活性化する相乗効果が原因。ブルーカーボン貯留へのリスク評価や対策に、両汚染物質の同時考慮が必要と結論。
English
This study demonstrates that microplastics (especially PLA) and nitrogen fertilizer synergistically increase CO2 emissions from seagrass soil by up to 106%, accelerating organic carbon loss. PLA degradation products support sulfate-reducing bacteria, while nitrogen enriches organic-matter-degrading microbes. The findings urge joint risk assessment of plastic waste and fertilizers in blue carbon ecosystems.
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いるが、本論文はマイクロプラスチックと窒素汚染の複合影響を定量的に示し、沿岸炭素貯留リスクの評価に新たな視点を提供。日本のブルーカーボンクレジット制度やJブルークレジットの生態系健全性評価にも示唆を与える。
In the global GX context
Globally, blue carbon ecosystems are recognized for climate mitigation; this paper highlights a previously overlooked synergistic threat from microplastics and nitrogen pollution. It informs risk assessments for coastal carbon stocks under the IPCC guidelines and supports integrated pollution management in coastal zones.
👥 読者別の含意
🔬研究者:Provides evidence of synergistic effects of microplastics and nitrogen on blue carbon loss, relevant for biogeochemistry and climate feedback research.
🏢実務担当者:Coastal managers and carbon crediting projects should consider microplastic and nutrient pollution as risks to carbon storage integrity.
🏛政策担当者:Suggests that plastic waste and agricultural runoff regulations should be coordinated 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 BCEs.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.26187/deakin.32817755first seen 2026-07-01 05:11:45 · last seen 2026-07-01 05:11:52
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