通过氨基化合物分布和降解指数揭示的冷沉积物中的有机物微生物加工
Yang Wu1, Lina Lyu2, Meiqing Lin3
1Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, 511458, China.
Marine pollution bulletin
|September 27, 2025
概括
南中国海冷中的有机物高度降解,甲氧化等微生物过程增强了分解. 在这些独特的深海环境中,真菌在碳循环中发挥着重要作用.
科学领域:
- 海洋地球化学 海洋地球化学
- 微生物生态学 微生物生态学
- 生物地质化学循环过程
背景情况:
- 冷是重要的深海生态系统,影响全球碳和循环.
- 了解有机物 (OM) 的特性对于评估这些环境中的OM降解和微生物活动至关重要.
研究的目的:
- 通过使用氨基酸 (AAs) 和氨基糖 (ASs) 作为生物标志物,研究冷沉积物中OM的特性和降解状态.
- 探索富含甲条件和微生物过程对OM组成和降解的影响.
主要方法:
- 从海马冷的沉积物核心中分析氨基酸和氨基糖度和成分,南中国海.
- 使用AA数据计算OM降解指数.
- 评估细菌衍生碳 (BDC),真菌衍生碳 (FDC) 和木酸 (MurA) 的贡献.
主要成果:
- 冷沉积物中的OM高度降解,根据AA基降解指数 (-0.3) 表示.
- 富含甲的沉积物显示了较低的AA度和降低的氨酸 (Phe) 比例,这表明OM通过微生物过程如甲无氧氧化 (AOM) 增强了OM降解.
- 在漏地区,真菌衍生的碳 (FDC) 对总有机碳 (TOC) 的贡献超过了细菌衍生的碳 (BDC),凸显了真菌的重要作用.
结论:
- 微生物过程,特别是AOM,在富含甲的冷透环境中显著调解OM降解.
- 氨基酸和氨基糖作为有效的生物标志物,用于评估深海沉积物中的OM特性和降解.
- 是冷中微生物碳池的重要组成部分,这对深海碳库的稳定性有影响.
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