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芳香污染物通过链延长重新连接土壤微生物的碳固定

Qing-Lian Wu¹, Tian Lan¹, Lin Deng¹

¹State Key Laboratory of Urban-rural Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.

The ISME journal

|November 25, 2025

概括

素等芳香污染物可以在低度下令人惊地促进土壤微生物碳链的延长,导致中链脂肪酸而不是碳损失. 然而,高水平的污染物损害了这一过程和土壤健康.

科学领域:

环境微生物学环境微生物学
生物地质化学生物地质化学
土壤科学土壤科学

背景情况:

芳香碳化合物 (,,乙,) 是已知的土壤污染物.
传统上,这些污染物被认为会通过矿化和生态毒性增加土壤碳损失.
对微生物碳转化途径的影响仍然不完全理解.

研究的目的:

研究芳香污染物对土壤中微生物碳动态的影响.
探索碳链延长在对芳香污染的反应中的作用.
阐明这些变化背后的分类学和分子机制.

主要方法:

用芳香污染物修改的土壤微观世界.
用于分类学分析的分阶段安普利康序列.
分子洞察力的元基因组学和元蛋白组学.
分析碳转化途径,包括链延长和降解.

主要成果:

低度的芳香污染物刺激微生物碳链的延长,产生中链脂肪酸.
污染物选择性地改变微生物群落,丰富某些延长细菌 (例如,Clostridium sensu stricto 12) 和抑制其他 (例如,Acinetobacter).
芳香污染物将碳从矿化转向链延长,其中Bacillus作为关键中间体.
分子机制包括增强基质吸收,改变乙-CoA通道,以及脂肪酸生物合成和β-氧化通路的调节.
高度的污染物会破坏新陈代谢的平衡,并抑制链条的延长.

结论:

具有悖论意义的,芳香污染物可以通过刺激微生物碳链在低度下延长来增强土壤碳保留.
这项研究揭示了污染土壤中碳转化以前被忽视的途径.
这些发现重新定义了芳香碳化合物的生态影响,突出了它们在调节土壤碳动态和无氧碳固定中的作用.

关键词:

在BTEX污染污染.碳封存是碳的封存方式.链条延长链条延长中链脂肪酸中链脂肪酸这是一个metagenomic.这里是metaproteomic的一个例子.土壤土壤土壤土壤土壤

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