甲的生态化学循环限制了地下水系统中的转化:有机分子特征和微生物功能网络
Xianjun Xie1, Enyu Li1, Honglin Jiang1
1MOE Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Wuhan, 430078, China; State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution & School of Environmental Studies, China University of Geosciences, Wuhan, 430078, China.
Water research
|December 4, 2025
概括
地下水中的甲循环显著影响 (As) 物种化. 不稳定溶解有机物 (DOM) 燃料 As (III) 释放,增强的甲氧化加速了这一过程,揭示了关键的生物地化学见解.
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:
- 地下水的 (As) 污染是一个全球性问题,主要是由微生物氧化还原过程和溶解有机物 (DOM) 进化驱动的.
- 甲循环 (甲生成和甲氧化) 在地质 As 污染地下水中的 As 物种转化中的具体作用尚不清楚.
研究的目的:
- 建立DOM分子特征,微生物群落和受污染的地下水中的As物种化之间的定量联系.
- 阐明甲循环对转化和动员的机械影响.
主要方法:
- 进行了沉积物微观宇宙实验,以模拟地下水的条件.
- 用里叶变换离子循环子共振质谱法 (FT-ICR MS) 来分析DOM分子组成.
- 甲基因组测序确定了微生物功能基因和参与生物地化学过程的网络.
主要成果:
- 性DOM通过甲基相关代谢显著促进了As(III) 调动 (1.04μg kg−1 d−1),增强的甲氧化进一步增加了As(III) 生产率 (3.30μg kg−1 d−1).
- 化DOM改变了铁和之间的地化学关系.
- 微生物继承表明甲基生物增加了甲产量 (高达7.23毫克kg-1d-1),而甲基基因增强了甲氧化 (94.99至190.76毫克kg-1d-1).
- 通过在微生物进展过程中对关键基因 (dsrAB,arsC) 的上调,观察到硫酸盐和As(V) 减少的合.
结论:
- DOM的热力学特性调节甲生成和甲氧化速率,直接影响的物种化.
- 甲循环加速的释放,突出其在地下水生物地质化学中的关键作用.
- 在DOM生物降解过程中的能量转化决定了的迁移,微生物网络和DOM特征互动地限制了A的物种化动态.
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