Microbial metabolism changes molecular compositions of riverine dissolved organic matter as regulated by temperature

This study investigated the control of dissolved organic matter (DOM) molecular compositions by microbial community shifts under temperature regulation (range from 5 to 35 °C), using riverine DOM and in situ microorganisms as examples. The functioning of different microbial metabolisms, including th...

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Bibliographic Details
Published in:Environmental pollution (1987) 2022-08, Vol.306, p.119416-119416, Article 119416
Main Authors: Tang, Gang, Zheng, Xing, Hu, Shiwen, Li, Binrui, Chen, Shuling, Liu, Tong, Zhang, Bowei, Liu, Chongxuan
Format: Article
Language:English
Subjects:
Dissolved organic matter
Microbial community
Microbial metabolism
Molecular composition
Proteobacteria
Temperature
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Summary:This study investigated the control of dissolved organic matter (DOM) molecular compositions by microbial community shifts under temperature regulation (range from 5 to 35 °C), using riverine DOM and in situ microorganisms as examples. The functioning of different microbial metabolisms, including the utilization and generation processes, was comprehensively analyzed. Though the overall quantity of DOM was less temperature-affected, more molecules were identified at moderate temperatures (e.g., 15 and 25 °C) and their accumulated mass peak intensities increased with the temperature. The results were ascribed to 1) the microbial production of macromolecular (m/z > 600) CHO, CHON, and CHONS species was stimulated at higher temperatures; 2) the microorganisms consumed more DOM molecules at both higher and lower temperatures; and 3) the simultaneously decreased utilization and increased generation of recalcitrant CHO and CHON molecules with m/z 
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2022.119416