厌氧甲氧化可以影响湖泊沉积物中的保留
Xiaoqing Shao1, Khoren Avetisyan1, David Sweetnam2
1Department of Physical & Environmental Sciences, University of Toronto Scarborough, Toronto, ON, M1C 1A4, Canada.
Environmental science and pollution research international
|September 17, 2025
概括
在淡水沉积物中,氧化甲 (AOM) 通过铁氧化水氧化物可以释放出大量的酸盐. 这种铁介导的AOM过程是影响这些生态系统中循环的关键因素.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 临界技术 临界技术
背景情况:
- 淡水沉积物的高有机含量往往与甲 (CH4) 存在和 (P) 释放有关.
- 在淡水系统内保持P的CH4氧化途径的作用仍未得到充分研究.
- 对氧化回收敏感的P分量,特别是与铁 (Fe) 和 (Mn) 氧化物结合的分量,在温带淡水沉积物中占主导地位.
研究的目的:
- 研究由铁氧化介导的无氧甲氧化 (AOM) 对沉积物 (P) 负荷的影响.
- 量化Fe-AOM对北方温带淡水生态系统中P释放的贡献.
主要方法:
- 实地实验研究在劳伦西亚北部大湖流域的淡水生态系统中进行.
- 使用建模平衡方法来评估P负载动态.
- 分析了沉积物的地质化学,包括CH4度和主导的P分数.
主要成果:
- 在沉积物中24厘米深处,最大CH4度达到109微米.
- 与AOM (Fe-AOM) 结合的Fe (III) 降解被提出为在16-20厘米深处SRP丰富的机制,促进Fe-oxyhydroxide溶解和P.释放.
- 据估计,Fe-AOM对P释放的贡献高达79.5μmol m−2天−1,得到了观察到的CH4消耗和地化学条件的支持.
结论:
- Fe-AOM显著影响淡水沉积物中的P负荷,可能释放大量的酸盐.
- 了解Fe-AOM的作用对于理解淡水系统中的P循环至关重要,因为这种过程很普遍.
- 在更深层沉积层中观察到维维亚尼特的形成,位于已识别的Fe-AOM活动区以下.
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