Molecular change of dissolved organic matter and patterns of bacterial activity in a stream along a land-use gradient

Water Research
Norbert KamjunkePeter Herzsprung

Abstract

Fluvial networks are globally relevant for the processing of dissolved organic matter (DOM). To investigate the change in molecular DOM diversity along the river course, high-field FTICR mass spectrometry and NMR spectroscopy of riverine DOM as well as bacterial abundance and activity were measured in a third order stream along a land-use gradient from pristine, agricultural to urban landscapes. DOM composition showed a clear evolution along the river course with an initial decrease of average oxidation and unsaturation followed by an increased relative abundance of CHNO and CHOS compounds introduced by agriculture and waste water, respectively. DOM composition was dominated by rather unsaturated CHO compounds (H/C ≤ 1) in headwaters and by more aliphatic molecules at downstream sites. Oxygenated functional groups shifted from aromatic ethers and hydroxyl groups to aliphatic carboxylic acids and aliphatic hydroxyl groups. This massive dislocation of oxygen significantly increased the diversity of atomic environments in branched aliphatic groups from headwater to downstream DOM. Mass spectra of DOM enabled the detection of compositional relationships to bacterial abundance and activity which was positively related to more alipha...Continue Reading

Citations

Jan 23, 2021·The Science of the Total Environment·Markus WeitereMario Brauns
Jun 15, 2021·Journal of Environmental Management·Hengfeng ZhangMawuli Dzakpasu
Jul 10, 2021·Environmental Geochemistry and Health·Valery P KalinitchenkoAbdulmalik A Batukaev

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