多种生态系统中溶解有机物的分子组成:对生物地化学循环的初步影响
Chen He1, Yuanbi Yi2, Ding He3
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
Journal of environmental management
|July 7, 2023
概括
溶解有机物 (DOM) 的分子组成在各个生态系统之间有很大的差异,从陆地土壤到海洋环境. 人类活动可能会增加DOM中的硫和,这凸显了全球DOM分子指纹数据库的需要.
科学领域:
- 环境化学环境化学
- 生物地质化学生物地质化学
- 分析化学 分析化学
背景情况:
- 里埃变换离子循环子共振质谱 (FT-ICR MS) 对于分析溶解有机物 (DOM) 分子组成至关重要.
- 以前的研究往往集中在有限的生态系统上,阻碍了跨生态系统的DOM源追踪和生物地化学循环理解.
- 了解DOM分子指纹在不同的环境中对全球生物地化学研究至关重要.
研究的目的:
- 为了比较DOM来自各种生态系统 (土壤,湖泊,河流,海洋,地下水) 的分子组成.
- 在不同的环境环境中调查DOM的生物地球化学循环和来源.
- 为了确定人类活动对DOM分子特征的潜在影响.
主要方法:
- 通过负离子喷射电气化离子化FT-ICRMS对来自不同生态系统的67个DOM样本进行分析.
- 分子特征的表征,包括陆地和生物复原成分.
- 通过环境梯度对DOM指纹进行比较分析.
主要成果:
- DOM的分子组成在各个生态系统中显著不同,森林土壤和海水的特征不同.
- 地质有机物沿河流-河口-海洋连续体降解.
- 盐湖DOM与海洋DOM具有共同的特征,表明反抗性的DOM捕获.
- 人类活动与DOM中来自受影响环境的S和N含有异构原子的增加有关.
结论:
- 生态系统类型强烈决定了DOM分子组成和生物地化学行为.
- 人类活动可以改变DOM分子结构,特别是异原子含量.
- 对于先进的生物地球化学研究,需要一个全面的,全球来源的DOM分子指纹数据库.
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