Spatio-temporal patterns and drivers of CH4 and CO2 fluxes from rivers and lakes in highly urbanized areas

Fan, Longfeng; Cheng, Junxiang; Xie, Yangcun; Xu, Ligang; Buttler, Alexandre; Wu, Yuexia; Fan, Hongxiang; Wu, Yakun

doi:10.1016/j.scitotenv.2024.170689

Science of The Total Environment

2024

DOI: 10.1016/j.scitotenv.2024.170689

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Spatio-temporal patterns and drivers of CH4 and CO2 fluxes from rivers and lakes in highly urbanized areas

Longfeng Fan,

Junxiang Cheng,

Yangcun Xie

et al.

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Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

Wang,

Li,

et al. 2024

ACS EST Water

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Rivers play a non-negligible role in global methane (CH 4 ) emissions. However, little research has focused on CH 4 emissions from rivers with high suspended sediment (SPS) concentrations, and how SPS influences riverine CH 4 emissions is still unclear. In this study, significant CH 4 emissions were observed in the upper reaches of the Yellow River, despite the extremely low organic-C level (DOC = 2.2 mg/L). The average value of CH 4 flux was 107.7 μmol m −2 d −1 , which was even higher than that of urban rivers with high organic pollution. The CH 4 emission pattern in the Yellow River differed from that of typical rivers; SPS rather than sediment plays an important role. In the upper reaches, anaerobic/aerobic microenvironments are more easily established on SPS under lower DO conditions, resulting in a high abundance of methanogens and functional genes. The genus Methanobacterium, typically found in sediments, was dominant in the water column and positively related to SPS concentrations. The strong winds and water flow further enhanced the mass transfer from the SPS surface to the atmosphere. Overall, this study demonstrates the significant potential of low-organic-country rivers to act as CH 4 hotspots in the presence of SPS.

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Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

Wang,

Li,

et al. 2024

ACS EST Water

View full text Add to dashboard Cite

show abstract

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Spatio-temporal patterns and drivers of CH4 and CO2 fluxes from rivers and lakes in highly urbanized areas

Cited by 1 publication

References 59 publications

Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

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Spatio-temporal patterns and drivers of CH4 and CO2 fluxes from rivers and lakes in highly urbanized areas

Cited by 1 publication

References 59 publications

Significant CH4 Emissions from the Yellow River: Importance of Suspended Sediment

Significant CH4 Emissions from the Yellow River: Importance of Suspended Sediment

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Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment

Significant CH₄ Emissions from the Yellow River: Importance of Suspended Sediment