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沉积物氧气需求与微生物之间的潜在联系及其对甘河溶解氧耗尽的贡献

Shoutao Cheng¹, Fansheng Meng², Yeyao Wang^1,3

¹Country School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, China.

Frontiers in microbiology

|August 15, 2024

概括

沉积物微生物驱动河流中的氧气耗尽. 有氧细菌的新陈代谢增加了沉积物氧需求 (SOD),降低了溶解氧 (DO) 水平,特别是在甘河等下游地区.

科学领域:

环境微生物学环境微生物学
水生生态学水生生态学
生物地质化学生物地质化学

背景情况:

沉积物氧需求 (SOD) 是水生系统中溶解氧 (DO) 耗尽的一个已知原因.
以前的研究经常独立研究化学和生物SOD.
在上层水域中微生物功能,SOD和DO枯竭之间的具体联系仍然不太清楚.

研究的目的:

调查沉积物微生物功能与SOD在导致DO枯竭的关系.
确定关键的微生物群体和推动甘河氧气消耗的生物地化学过程.
为恢复DO贫的河流环境提供见解.

主要方法:

从甘河上游 (控制) 和下游 (DO耗尽) 站点取沉积物样本.
测量水生物理化学参数和SOD速率.
使用16S rRNA基因测序分析微生物社区结构和功能.

主要成果:

与对照地点相比,DO枯竭的地点显示出明显更高的SOD率.
微生物社区结构受到总有机碳 (TOC) 的影响,特定的类 (蛋白质细菌,Chloroflexi,Bacteroidota) 显示空间变化.
有氧微生物的丰富性,特别是蛋白质细菌,以及参与碳,,硫和循环的微生物与DO负相关,与SOD正相关.

结论:

有氧细菌代谢过程直接增加SOD,导致上层水域的DO耗尽.
针对涉及甲和硫化循环的微生物机制对于重新氧化工作至关重要.
了解这些微生物驱动因素对于有效恢复和管理被DO削弱的河流至关重要.

关键词:

甘河甘河是一条河流.溶解的氧气耗尽的消耗.沉积物微生物的假定功能沉积物的沉积物沉积物氧气需求沉积物氧气需求

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