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

Tang，Gang1,2; Zheng，Xing2; Hu，Shiwen1; Li，Binrui1,3; Chen，Shuling1; Liu，Tong2; Zhang，Bowei1; Liu，Chongxuan1

2022-08-01

10.1016/j.envpol.2022.119416

ENVIRONMENTAL POLLUTION   影响因子和分区

0269-7491

1873-6424

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 < 600 at higher temperatures. The strong correlations among the temperature, community structures, and DOM chemodiversity suggested that temperature promoted the community evenness to increase the DOM generation. In addition, the higher temperature decreased the abundance of microorganisms that utilized more recalcitrant molecules and produced fewer new molecules (e.g., Proteobacteria, Acinetobacter, and Erythrobacter) while increased others that functioned the opposite (e.g., Verrucomicrobia, Bacteroidetes, and Flavobacterium) to increase the DOM production. The constructed temperature-community-DOM chemistry relationship deepened the molecular-level understanding of DOM variations and provided implications for the warming future.

Dissolved organic matter Microbial community Microbial metabolism Molecular composition Proteobacteria Temperature

SCI ; EI

英语

第一 ; 通讯

Guangdong Science and Technology Department[2017ZT07Z479];China Postdoctoral Science Foundation[2021M701561];National Natural Science Foundation of China[51738012];National Natural Science Foundation of China[51878555];National Natural Science Foundation of China[52170053];

Environmental Sciences & Ecology

Environmental Sciences

WOS:000803996200006

ELSEVIER SCI LTD

20221912095342

Biogeochemistry ; Dissolution ; Metabolism ; Molecules ; Organic compounds

Biology:461.9 ; Geochemistry:481.2 ; Biochemistry:801.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Atomic and Molecular Physics:931.3

ENVIRONMENT/ECOLOGY

2-s2.0-85129570459

Scopus

1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an,710048,China
3.Civil and Environmental Engineering Department,Université de Sherbrooke,Sherbrooke,QC J1K 2R1,Canada

Tang，Gang,Zheng，Xing,Hu，Shiwen,et al. Microbial metabolism changes molecular compositions of riverine dissolved organic matter as regulated by temperature[J]. ENVIRONMENTAL POLLUTION,2022,306.

Tang，Gang.,Zheng，Xing.,Hu，Shiwen.,Li，Binrui.,Chen，Shuling.,...&Liu，Chongxuan.(2022).Microbial metabolism changes molecular compositions of riverine dissolved organic matter as regulated by temperature.ENVIRONMENTAL POLLUTION,306.

Tang，Gang,et al."Microbial metabolism changes molecular compositions of riverine dissolved organic matter as regulated by temperature".ENVIRONMENTAL POLLUTION 306(2022).