无氧海草叶片环境作为毒素生产和N2O排放的潜在热点
Qingfeng Zhang1, Michael Kühl1, Kasper Elgetti Brodersen2
1Marine Biological Section, Department of Biology, University of Copenhagen, Strandpromenaden 5, 3000 Helsingør, Denmark.
Marine pollution bulletin
|October 17, 2024
概括
海草上的生生物膜会形成无毒区,产生有害气体,如氧化 (NO) 和硫化 (H2S). 轻化燃料释放氧化 (N2O),可能会否定海草碳捕集.
科学领域:
- 海洋微生物生态学
- 海草生态系统的正常运作
- 沿海环境中的生物地质化学循环.
背景情况:
- 海草生植物生物膜可以由于呼吸和有限的氧气扩散而创造无毒的微生物息地.
- 在这些区域的无氧微生物活动可能会产生植物毒素和温室气体,但人们对此了解甚少.
研究的目的:
- 研究海草生生物膜中的关键气体 (O2,NO,N2O,H2S) 的发生和动态.
- 分析这些生物膜的细菌群体组成.
- 评估环境条件对天然气生产和交换的影响.
主要方法:
- 使用微型传感器测量Zostera海洋生生物膜中的O2,NO,N2O和H2S度梯度.
- 在不同的环境条件下 (流量,氧气,酸盐水平) 监测气体动态.
- 采用16S rRNA基因扩增序列测序来确定细菌社区结构.
主要成果:
- 在无氧生物膜区域中检测到明显的NO,N2O和H2S的产生.
- 主导细菌包括Flavobacteriaceae和Rhodobacteraceae,以及无处不在的硫酸盐减少细菌 (Desulfobacterota).
- 生物膜在良性化条件下的N2O排放达到9.6μmol N2O m-2 day-1,可能抵消碳埋葬.
结论:
- 海草生菌生物膜含有无氧微生物过程,产生植物毒和温室气体.
- 海洋环保增强了N2O的产生和释放,影响了它们的生态作用.
- 这些微生物过程可能会对海草的健康和草的碳捕集能力产生负面影响.
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