碳固定在不同营养水平的湖沉积物中的生物和非生物调节
Hezhong Yuan1, Bin Li1, Yiwei Cai1
1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Environmental science & technology
|March 20, 2024
概括
湖泊沉积物保存有机碳 (OC) 主要来自藻类,而不是陆地. 氧化铁调节了OC的埋葬,而罕见的细菌,而不是丰富的细菌,是湖泊沉积物中碳固定的关键.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 湖泊沉积物对于有机碳 (OC) 保存至关重要,但它们的碳循环生物地质化学知之甚少.
- 了解湖泊中的OC循环对于全球碳预算评估至关重要.
研究的目的:
- 研究铁 (Fe) 分数和OC 分数在湖泊沉积物中的碳保存中的作用.
- 探索细菌群落对湖泊生态系统中碳固定和结合的贡献.
主要方法:
- 在湖泊沉积物中分析总的OC (TOC) 和与氧化铁相关的OC (TOCFeO).
- 高通量测序以确定编码RuBisCO基因 (cbbL和cbbM) 的细菌群落的丰富性和组成.
主要成果:
- 本土藻类 (低C/N比率,特定的δ13C值) 是OC埋葬的主要来源,超过了土著投入.
- TOCFeO代表了一个显著的碳汇,复杂的氧化铁 (Fep) 与固定的TOC分数正相关.
- 铁的氧化还原转移影响了OC的损失,而罕见的细菌属 (例如,*Acidovora*, *Thiobacillus*) 在碳固定中充当了关键物种,而不是非常丰富的属.
结论:
- 功能性基因的绝对丰富性不仅仅决定了CO2在沉积物中的固定.
- 罕见和丰富的细菌属共同调节湖泊沉积物中的碳联结和固定.
- 铁循环显著影响有机碳的保存和损失在湖泊生态系统.
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