Temperature effects on microbial dissolved organic matter metabolisms: Linking size fractions, fluorescent compositions, and functional groups

Tang，Gang1,2,3; Li，Binrui3,4; Zhang，Bowei3; Hu，Shiwen3; Chen，Shuling3; Liu，Tong1; Wang，Qianqian3; Qiao，Han3; Zheng，Xing1

2023-03-15

10.1016/j.scitotenv.2022.161175

SCIENCE OF THE TOTAL ENVIRONMENT   Impact Factor & Quartile

0048-9697

1879-1026

This study elucidated the compositional and structural variations of size fractions of microbially-induced dissolved organic matter (DOM) caused by short-term temperature changes (5 to 35 °C), taking riverine DOM as an example. A simple and efficient method combining fractionation-[parallel factor analysis and two-dimensional Fourier-transform infrared correlation spectroscopy (PARAFAC-2D FTIR COS)]-correlation was introduced to link fluorescent DOM components and their structures in terms of surface functional groups. Results indicated that the higher temperature stimulated the decomposition of aromatics (sizes decreased from 10 kDa-0.22 μm to <10 kDa) and the transformation of proteins to humics (with sizes <0.22 μm); while both the higher and lower temperatures inhibited the utilization of larger-sized DOM (>0.22 μm, especially the non-fluorescence part) and synthesis of larger-sized microbial-derived proteins and humics (>0.22 μm), which may result in more smaller-sized (<10 kDa) and refractory aromatics transported from rivers to oceans in the warming future. However, the structure-determined DOM behaviors could be less affected by temperature since the fluorescent proteins and humics revealed similar functional group compositions, such as carboxyl, hydroxyl, carbonyl/aldehyde, carboxylic anhydride, and carboxamide groups. These findings have strong implications for DOM biogeochemistry in future temperature-shock scenarios. The proposed method will support in-depth analyses of structure-regulated processes from a mechanistic perspective.

Composition-structure correlation Dissolved organic matter Microbial metabolism PARAFAC-2D FTIR COS Size fraction Temperature

SCI

English

Corresponding

National Natural Science Foundation of China["52170053","51878555","51738012","42107055"] ; China Postdoctoral Science Foundation["2021M701561","2021M701587"]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000961128000001

ELSEVIER

ENVIRONMENT/ECOLOGY

2-s2.0-85144603043

Scopus

1.State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an,710048,China
2.Melbourne Climate Futures Academy,Climate & Energy College,School of Geography,Earth and Atmospheric Sciences,The University of Melbourne,Melbourne,3010,Australia
3.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
4.Civil and Environmental Engineering Department,Université de Sherbrooke,Sherbrooke,J1K 2R1,Canada

Tang，Gang,Li，Binrui,Zhang，Bowei,et al. Temperature effects on microbial dissolved organic matter metabolisms: Linking size fractions, fluorescent compositions, and functional groups[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,864.

Tang，Gang.,Li，Binrui.,Zhang，Bowei.,Hu，Shiwen.,Chen，Shuling.,...&Zheng，Xing.(2023).Temperature effects on microbial dissolved organic matter metabolisms: Linking size fractions, fluorescent compositions, and functional groups.SCIENCE OF THE TOTAL ENVIRONMENT,864.

Tang，Gang,et al."Temperature effects on microbial dissolved organic matter metabolisms: Linking size fractions, fluorescent compositions, and functional groups".SCIENCE OF THE TOTAL ENVIRONMENT 864(2023).