结合铁的有机碳在亚底沉积物中的循环和持久性
Yunru Chen1,2, Liang Dong3, Weikang Sui3
1State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
Nature communications
|July 29, 2024
概括
反应性结合铁的有机碳 (FeR-OC) 是海洋沉积物的重要碳汇. 这项研究揭示了其在地下区域的重新动员和重矿化,影响了微生物活动和全球碳循环.
科学领域:
- 地质化学 地质化学
- 海洋生物地质化学海洋生物地质化学
- 古海洋学是古海洋学.
背景情况:
- 反应性铁 (FeR) 在海洋沉积物中结合有机碳 (OC),保留了总有机碳 (TOC) 的很大一部分.
- 这种反应性铁结合有机碳 (FeR-OC) 在地下环境中的命运和微生物的可用性在很大程度上是未知的.
- 了解FeR-OC动态对于评估海洋沉积物中的碳捕集和微生物碳循环至关重要.
研究的目的:
- 为了研究FeR-OC在海洋沉积物的下核分布和命运.
- 为了确定FeR-OC在微生物过程中的作用,在suboxic到methanic区域内.
- 量化FeR-OC对硫酸盐-甲过渡区 (SMTZ) 碳循环和甲消耗的贡献.
主要方法:
- 从南中国海北部的沉积物核心中重建连续的FeR-OC记录.
- 对不同生物地化学区域 (从suboxic到methanic) 的FeR-OC比率与TOC的分析.
- 调查FeR-OC同位素特征 (13C耗尽) 和它与甲循环的关系.
主要成果:
- 在海洋沉积物中,FeR-OC占TOC的稳定比例 (13.3 ± 3.2%).
- 在SMTZ中观察到显著较低的FeR-OC百分比 (<5%的TOC) 和13C耗尽.
- 微生物重新调动和FeR-OC的重矿化在SMTZ中对甲消耗有很大 (18-30%) 的贡献.
结论:
- 微生物在地下沉积物中积极处理FeR-OC,特别是在SMTZ中.
- 海洋沉积物中的全球FeR-OC储存量很大,可能会影响大气碳水平.
- FeR-OC在支持地下微生物群落和调节地球碳循环方面发挥着至关重要的作用.
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