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未加热和实验室加热的溶解有机物质的生物降解性

Saraf Islam Promi^1,2, Courtney M Gardner^1,2, Amanda K Hohner^1,3

¹Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, USA.

Environmental science. Processes & impacts

|July 16, 2024

概括

野火将部分燃烧的有机物释放到水中. 实验室实验表明,这种溶解的热性有机物 (dPyOM) 比未燃烧的物质更容易生物降解,影响水生生态系统.

科学领域:

环境化学环境化学
水生生地化学水生生地化学
微生物生态学微生物生态学

背景情况:

野火留下部分燃烧的生物质,通过侵蚀释放溶解的热性有机物 (dPyOM) 进入水生系统.
火灾后的DOM变化对DOM稳定性和生物地球化学循环至关重要.
对dPyOM的生物降解知之甚少,可能取决于燃烧温度和燃料类型.

研究的目的:

为了比较未加热,低 (250 °C) 和中等 (450 °C) 温度加热的森林地板材料中溶解有机物 (DOM) 的生物降解性.
调查燃烧温度对DOM成分及其随后的微生物降解的影响.

主要方法:

实验室加热和浸出森林地板材料 (土壤和垃圾) 来制造dPyOM浸出物.
使用河流微生物进行注射实验,以评估DOM生物降解能力超过38天.
监测溶解有机碳 (DOC),溶解有机 (DON),无机和DOM光学性能.

主要成果:

低 (64%) 和中度 (71%) 温度的dPyOM显示出明显更高的DOC生物降解比未加热的DOM (32%).
加热的液具有较低的分子量DOM组成,以更高的初始E2/E3比率表示,并且在化后显示出这种比率的较大下降.
中温dPyOM显示了最高的DON降解 (74%),其次是低温 (58%) 和未加热 (51%) 的样品.

结论:

在低温和中温下产生的溶解的热性有机物比未加热的DOM更容易生物降解.
加热DOM的生物降解性增加与其较低分子量组成有关.
这些发现对生物地球化学循环,生态系统功能和受火灾影响的流域的水质有重大影响.

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