在野地-城市界面火灾发生后,地表水微生物对燃烧性碳的反应
Lyssa Morgan1, Allison Tilzey1, Maya El-Ajouz1
1Civil & Environmental Engineering, University of California-Irvine, Irvine, CA 92697, USA. chris.olivares@uci.edu.
Environmental science. Processes & impacts
|January 15, 2026
概括
野火会将多环芳 (PAH) 释放到水道中. 火灾后的风暴转移了微生物群落,有利于PAH降解,表明它们迅速适应这些污染物.
科学领域:
- 环境微生物学环境微生物学
- 有机地化学 有机地化学
- 生态系统的恢复生态系统的恢复
背景情况:
- 野地-城市界面 (WUI) 的火灾将热性有机污染物,如多环芳 (PAHs) 引入地表水中.
- 这些污染物对火灾后水生生态系统中微生物群体动态的影响在很大程度上尚未评估.
研究的目的:
- 为了研究微生物群落和WUI火灾后的烧化碳之间的相互作用.
- 评估火灾后风暴事件对表面水中的PAH和溶解有机碳 (DOC) 负载的影响.
- 为了确定微生物群落的组成和功能在响应热原污染物时的变化.
主要方法:
- 在WUI受火灾影响的小溪中,在火灾后的风暴事件中进行现场采样.
- 对多环芳 (PAH) 和溶解有机碳 (DOC) 的化学分析.
- 高通量测序和生物信息学分析以表征微生物群体组成和预测代谢途径.
主要成果:
- 火灾后的低强度风暴显示出PAH排放量最高,其中包括[a]烯和[a].
- PAH度相互相关,但与DOC或度无关,这表明预测PAH冲的局限性.
- 已知可降解PAH的微生物属 (例如,Pseudomonadota, Bacteroidota) 差异丰富,PAH生物降解中间体的途径在火灾下游增加.
结论:
- 来自WUI火灾的燃烧性碳显著改变了微生物社区的功能和组成.
- 在火灾发生后不久,微生物群体表现出快速转变,有利于PAHs的降解.
- 降解PAH的微生物很普遍,并且很容易对受WUI火灾影响的水生环境中的烧热污染做出反应.
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