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野火产生的高温溶解有机物 (pyDOM) 增强河流DOM反应和代谢

Mingxing Cao¹, Hua Ma¹, Yixuan Ye¹

¹College of Environment and Ecology, Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.

Environmental science & technology

|June 7, 2025

概括

野火会向河流释放热性溶解有机物 (pyDOM),增加耐火化合物并改变微生物群落. 这种pyDOM增强了水中循环和脱,影响了碳捕集.

科学领域:

环境化学环境化学
微生物生态学微生物生态学
生物地质化学生物地质化学

背景情况:

野火显著改变土壤有机物质,影响全球碳循环.
热性溶解有机物 (pyDOM) 对河流溶解有机物 (DOM) 反应活性和微生物代谢的影响尚不清楚.

研究的目的:

研究用pyDOM修改的河水中的DOM和微生物反应的分子转化.
评估pyDOM对DOM反应性,微生物多样性和代谢途径的影响.

主要方法:

用DOM从受野火影响和未被干扰的土壤中对河水进行受控的化.
高分辨率质谱和基板显式建模用于DOM分析.
微生物反应和基因组见解的反应学分析和PICRUSt2.

主要成果:

引入PyDOM增加了具有高芳香度和双键等效的耐火DOM组件.
PyDOM增强了DOM的反应性,改变了微生物群落,增加了丝状蓝藻细菌,促进了代谢.
基因组分析揭示了pyDOM驱动的脱路径的丰富,特别是有氧脱.

结论:

PyDOM充当生物地化学载体,将陆地碳转移到水生生态系统中.
这些发现凸显了将pyDOM流量纳入气候相关的生物地球化学框架的必要性.
PyDOM影响河流微生物的新陈代谢和循环,对碳捕集有影响.

关键词:

的新陈代谢.俄米克斯 (omicsics) 是一个电子产品.pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM pyDOM 河流河流河流河流野火野火是一场野火.

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