溶解有机碳
生物地球化学循环
微生物种群生物学
汇流
作文(语言)
河口
蛋白质细菌
城市河流
功能(生物学)
异养
碳循环
微生物代谢
环境科学
生物
水文学(农业)
地理
环境化学
生态学
水质
细菌
生态系统
化学
程序设计语言
计算机科学
16S核糖体RNA
遗传学
作者
Yi Li,Chen Xu,Wenlong Zhang,Li Lin,Longfei Wang,Lihua Niu,Huanjun Zhang,Peifang Wang,Chao Wang
出处
期刊:Water Research
[Elsevier]
日期:2020-02-01
卷期号:169: 115293-115293
被引量:45
标识
DOI:10.1016/j.watres.2019.115293
摘要
River confluences result in mixture and transformation of dissolved organic matter (DOM), influencing the phylogeny of microbial community, furthermore, the integrity and function of river systems. The relationship between the microbial community and DOM is complex, especially in the confluence zone. Previous reports focused on shifts in the different bacterial community in response to exposure to the same terrestrial DOM. However, the transformation of bacterial community induced by convergent DOM remains unknown. This study showed the shifts of DOM components at the junction via excitation-emission matrices parallel factor analysis. Metabolic differences were also determined via phylogenetic investigation of communities by reconstruction of unobserved states. The results demonstrated a direct link between the microbial metabolism and DOM biodegradation during the heterotrophic process. In response to diverse DOM conditions, the taxonomic composition and metabolic function of the microbial community presented significant differences. Different taxa may be involved in metabolizing various DOM components. As indicative bacteria that are closely associated with DOM components, Proteobacteria (Sphingomonas) are significant for microbial utilization and were important during the DOM-degrading process. Compared with other conditions, the abundance of carbon metabolism was higher in convergences where urban rivers joined with estuary or source water. Furthermore, humic-like DOM, converging in the confluence zone, induced a more active lipid metabolism. This study applied techniques that capture the diversity and complexity of bacterial communities and DOM, and provides new insight on the basis of the interaction between bacterial communities and DOM in confluence processes of biogeochemical significance.
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