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在沿海湖系统的Fe (III) 和Mn (IV) 减少中微生物学介导的氨损失

Guillermo Samperio-Ramos¹, Oscar Hernández-Sánchez¹, Víctor F Camacho-Ibar¹

¹Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Ensenada, Mexico.

|December 13, 2023

概括

非正规的Anammox (NC-Anammox),包括铁和的还原途径,可以去除沿海沉积物中的. 海草的存在和沉积物质的特性影响NC-Anammox率,大大导致湖系统中的气损失.

科学领域:

环境微生物学环境微生物学
生物地质化学生物地质化学
沿海生态沿海生态

背景情况:

无氧氨氧化 (Anammox) 是一种关键的微生物去除过程.
涉及铁 (Feammox) 和 (Mnammox) 减少的非正规Anammox (NC-Anammox) 途径是最近发现的去除机制.
在潮下沿海沉积物中NC-Anammox的空间分布和环境驱动因素在很大程度上是未知的.

研究的目的:

为了确定潜在的NC-Anammox率和潮下沿海沉积物中相关细菌的丰富性.
研究环境因素,如海草的存在和沉积物特征对NC-Anammox活动的影响.
在沿海湖系统中阐明NC-Anammox通道的空间分布和控制因素.

主要方法:

使用N同位素追踪来量化NC-Anammox率.
采用分子分析来确定异型降解金属细菌 (Acidomicrobiaceae A6和Geobacteraceae) 的丰富性.
在巴伊亚德圣昆廷湖系统的不同部门的不同深度收集的沉积物核心.

主要成果:

通过³⁰N₂生产和金属减少率之间的正相关性,证明了Feammox和Mnammox的同时存在.
在潮下沉积物中检测到NC-Anammox活性,其速率从0.07-0.62μg Ng^{-1天^-1天.}
与裸体沉积物相比,在植被沉积物中观察到较高的NC-Anammox率,其中含有地下峰值 (5-15厘米).
确定了海草的存在,有机碳和可降解Fe (III) /Mn (IV) 作为影响NC-Anammox活性和去除的关键因素.
由于Feammox和Mnammox在研究区域造成的每年气损失估计为32.31±3.57tN.

结论:

在潮下沿海沉积物中,NC-Anammox通路是活跃的,有助于提取.
海草草地增强NC-Anammox活动,影响沿海湖中的循环.
沉积物特性和金属的可用性是NC-Anammox工艺的关键驱动因素.
这项研究提高了对沿海环境中和微量金属循环的理解.

关键词:

生物地化学过程生物地化学过程沿海沉积物的沉积物分离式的减金属细菌可以减少金属.在Feammox中使用Feammox.微生物可降解的Fe (III) 和Mn (IV)这就是Mnammox.由于气的损失导致了气的损失.有机碳有机碳是有机碳的组成部分.海草是一种海草.

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