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二次生产和原始化重新塑造了海洋沉积物的有机物组成

Qing-Zeng Zhu^1,2, Xiuran Yin^1,3,4, Heidi Taubner^1,5

¹MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany.

Science advances

|May 17, 2024

概括

海洋沉积物微生物通过降解和原始化转化有机物 (OM). 这项研究表明,由小细菌驱动的二次生产显著影响海洋环境中的碳循环和OM命运.

科学领域:

海洋生物地质化学海洋生物地质化学
微生物生态学微生物生态学
碳循环是碳循环的过程.

背景情况:

在海洋沉积物中有机物 (OM) 的分解对全球碳循环至关重要.
在海洋生物地球化学研究中,二次生产和原始化效应被低估了.

研究的目的:

调查二次生产和初始化在海洋沉积物OM转化中的作用.
量化碳流入微生物生物质及其营业额.
为了确定OM降解和原始化的微生物驱动因素.

主要方法:

用C标记的藻类基质化货架沉积物400天.
使用RNA进行稳定同位素探测,以识别活跃的微生物群落.
在氨基酸中进行C合并分析,以追踪碳流入生物质.

主要成果:

数量较小的异质型细菌矿化了大量添加的脂质 (~65%) 和蛋白质 (~20%).
高达11%的藻类脂质碳被纳入二级生产者生物质,具有动态的营业额.
藻类脂质添加刺激了本土OM降解 (原始化) 的2.5至6倍,超过直接基质利用.
化是由各种细菌驱动的,包括硫和铁循环组,导致大量的二次生产.

结论:

微生物降解,二次生成和原始化是相互关联的过程,决定了海洋沉积物中的OM命运.
小细菌群在OM矿化和碳循环中起着不成比例的重要作用.
了解这些微生物相互作用对于准确的全球碳循环建模至关重要.

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