Seasonal hydrological change shaping the relationship between dissolved organic matter and land use in the middle reaches of the Yangtze river

The effect of hydrology and land use on the sources and molecular composition of dissolved organic matter (DOM) within large rivers is vital for carbon cycling. However, it is still unclear how hydrological change influences the response of DOM composition to land use. Here, we report longitudinal p...

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Bibliographic Details
Published in:Biogeochemistry 2023-04, Vol.163 (3), p.329-345
Main Authors: Liao, J., Huang, Q. H., Liu, G. N., Wang, N. T., Qiu, Z. P., Hu, C. Y., Spencer, R. G. M.
Format: Article
Language:English
Subjects:
Aromatic compounds
Biogeosciences
Biological activity
Canyons
Carbon cycle
Chemical composition
Dissolved organic matter
Dry season
Earth and Environmental Science
Earth Sciences
Ecosystems
Environmental Chemistry
Flocculation
Flow paths
Fluorescence
Forest soils
Groundwater
Hydrology
Land use
Leachates
Life Sciences
Microbial activity
Microorganisms
Monsoons
Photochemicals
Photochemistry
Rainy season
Residence time
River systems
Rivers
Seasons
Soil erosion
Subsoils
Water level fluctuations
Water levels
Wet season
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Summary:The effect of hydrology and land use on the sources and molecular composition of dissolved organic matter (DOM) within large rivers is vital for carbon cycling. However, it is still unclear how hydrological change influences the response of DOM composition to land use. Here, we report longitudinal patterns in DOM content and composition based on absorbance and fluorescence measurements along the middle Reaches of the Yangtze river, during two contrasting hydrological seasons. We found that soil leachate, metropolitan effluent, and microbiological production mainly contribute to the composition of DOM in the middle Yangtze. In addition, the relationship between land use and the fluorescence fingerprint of riverine DOM was season dependent. During the wet season, a higher content of aromatic and humic DOM was mobilized due to enhanced forest soil erosion, and relatively shallow soil-to-mainstem flow paths (R 2  = 0.76, p  
ISSN:0168-2563
1573-515X
DOI:10.1007/s10533-023-01035-w