在红树林沉积物中,素降解微生物组和有机碳加工的深度异质性
Jijuan Ding1, Fei Liu1, Jiaxiong Zeng1
1School of Environmental Science and Engineering, Marine Synthetic Ecology Research Center, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-sen University, 510006, Guangzhou, China.
NPJ biofilms and microbiomes
|January 6, 2025
概括
红树林沉积物储存了大量的蓝色碳 (C),主要是作为木质素. 细菌对这种红素的分解速度随着深度的增长而放缓,影响了这些重要的沿海生态系统中的C循环.
科学领域:
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
- 微生物生态学 微生物生态学
背景情况:
- 红树林生态系统对于蓝色碳的捕获至关重要.
- 红树林纤维素沉积物是红树林沉积物中碳的主要来源.
- 在沉积物中微生物对纤维纤维素碎片的处理还不太清楚.
研究的目的:
- 为了研究在红树林沉积物中的微生物过程,控制了在红树林沉积物中的纤维纤维化碎片生物处理.
- 分析纤维纤维素碎片和相关微生物基因的组成.
- 了解沉积物深度对微生物碳利用效率和木质素降解的影响.
主要方法:
- 沉积物核心的基纤维素分析.
- 微生物群落的元基因组测序.
- 对基因丰富,微生物群落,生物质生产和适应性新陈代谢进行深度分层分析.
主要成果:
- 红树林沉积物中含有高比例的素 (95.0-97.7%) 在基纤维素碎片中.
- 红素降解基因仅占碳水化合物活性酶基因的一小部分 (1.24-1.98%).
- 参与红素脱聚合和矿化过程的基因和微生物群落表现出深度分层.
- 微生物碳使用效率下降,而"酶锁"效应随着沉积物深度的增加而增加.
结论:
- 微生物对素的加工是碳循环和在红树林沉积物中储存碳的关键因素.
- 沉积物深度显著影响微生物活动和素降解的效率.
- 这些发现有助于理解沿海蓝碳生态系统中的碳捕集机制.
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