在深海沉积物中垂直分层碳固定和合过程
Hai Shi1, Xiaotong Zhang1, Liyan Liu1
1Frontiers Science Center for Deep Ocean Multispheres and Earth System, and College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, Shinan District, Qingdao 266000, China.
ISME communications
|January 7, 2026
概括
深海微生物通过多种途径固定碳,随着深度的变化而变化. 溶解的无机碳和驱动这些过程,揭示了关于深层生物圈碳循环的关键见解.
科学领域:
- 海洋微生物学 海洋微生物学
- 生物地质化学生物地质化学
- 深海生态 深海生态
背景情况:
- 深海沉积物对全球碳循环至关重要,但人们对其了解甚少.
- 微生物的碳固定,其途径,以及深海环境中的驱动因素在很大程度上仍未被探索.
研究的目的:
- 在南中国海沉积物中研究微生物碳固定和能量代谢.
- 确定碳固定路径的垂直分布及其环境驱动因素.
- 在沉积物深处参与碳固定的微生物群落的特征.
主要方法:
- 在沉积物核心 (0-690厘米) 中分析了微生物碳固定和相关的能量代谢.
- 评估了环境因素的影响,如溶解的无机碳和.
- 利用元基因组分析识别碳固定途径,功能基因和微生物种类.
主要成果:
- 溶解的无机碳和的度是碳固定和氧化还原过程的关键驱动因素.
- 碳固定基因多样性随着深度的增加而增加,而网络复杂性则下降.
- 观察到垂直连续的路径:表面沉积物中的卡尔文-本森-巴什姆 (CBB) 和还原型甘氨酸 (rGLY),深层的木-Ljungdahl (WL).
- 在表面沉积物中占主导地位的是Gammaproteobacteria和Methylomirabilia;在深处占主导地位的是Desulfobacterota,Chloroflexota和Aerophobota.
- 大多数已识别的碳固定微生物都表现出混合营养的生活方式.
结论:
- 深海地下微生物群落具有显著的碳固定潜力.
- 这些发现有助于更好地了解深层生物圈中的碳流和微生物代谢策略.
- 微生物群落和代谢途径的垂直分层是深海沉积物的关键特征.
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