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[由藻类分解产生的溶解有机物质的动态变化和优湖中的环境影响]

Jin Zhang¹, Ming-Ying Chen², Zhi-Neng Hao^3,4

¹State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.

Huan jing ke xue= Huanjing kexue

|March 12, 2024

概括

湖泊中的藻类分解显著增加了溶解有机物 (DOM),改变了其质量并增加了温室气体排放. 微生物群落转移,影响营养循环和湖泊健康.

科学领域:

环境科学环境科学
水生化学水生化学
微生物学微生物学

背景情况:

湖泊缩导致藻类繁殖,导致分解和释放溶解有机物 (DOM).
藻类衍生的DOM影响DOM的数量,组成和湖泊中的生物地球化学循环.
了解藻类分解期间的DOM动力学对于管理环死湖至关重要.

研究的目的:

为了研究在不同优食条件下藻类分解过程中DOM数量和质量的动态变化.
探索藻类分解对环境的影响,包括微生物反应和温室气体排放.
提供关于藻类衍生的DOM命运及其对湖泊生态系统的影响的见解.

主要方法:

在模拟的藻类分解过程中监测DOM数量和质量.
使用超高分辨率质谱测量来描述DOM分子组成.
使用16S rRNA基因测序分析微生物社区的转变.
从水中测量温室气体 (CO2和CH4) 排放量.

主要成果:

藻类分解增加了DOM水平,生物可用性和光,随着时间的推移,总DOM下降,平均分子量增加.
微生物优先消耗不和碳化合物和阿里法基化合物,而产生耐火化合物,如素和素.
主导的细菌群落从蛋白质细菌转变为细菌群.
温室气体排放 (CO2和CH4) 增加了1.2-5倍,这是a254光学指数可以预测的.

结论:

藻类分解显著改变水生DOM特征,有利于形成耐火物质.
在DOM组成的变化影响微生物社区的结构和功能.
增加的温室气体排放与藻类分解有关,这为预测性监测提供了潜力.
这项研究增强了对DOM在缩湖中的行为的理解,有助于缓解策略.

关键词:

藻类分解藻类分解生物可用性生物可用性溶解的有机物质是一种有机物质.温室气体的温室气体是什么相对分子量相对分子量.

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