Sedimentary organic matter of channel type reservoirs: input of lipid biomarker for source assessment - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Lake Sciences Année : 2024

Sedimentary organic matter of channel type reservoirs: input of lipid biomarker for source assessment

Résumé

Hydropower development has increased the degree of fragmentation of riparian habitats and the problem of reservoir sediment trapping. However, there is limited research on the source and distribution characteristics of organic matter (OM) in river reservoirs. Therefore, the migration mechanisms of OM in reservoirs remain unclear. In this study, the lipid biomarker analysis method was applied to surface sediments of Pubugou Reservoir in Dadu River. Sediment OM lipid components were analysed by gas chromatography-mass spectrometry (GC-MS), and were quantified and classified into four sources: natural, petrogenic, pyrogenic and sewage markers. The results showed that the average content of organic matter (OM) in the upstream area of the dam (10.7±4.8%) is higher than that in the downstream area of the dam (7.3±0.9%) and within the reservoir (6.7±1.8%), indicating the impact of reservoir interception on the accumulation of sedimentary OM. The extractable lipid fraction was mainly derived from natural markers (45.9±13.9%). The OM was represented by the relative ratio of CPI (Carbon Preference Index), TAR (Terrestrial/Aquatic Ratio) and Paq (Terrestrial/Aquatic Plant Input Ratio). It comes mainly from terrestrial higher plants, accounting for 70.5±9.1% of the natural quantitative molecules. In addition, the number of anthropogenic marker molecules increased significantly (44.6±25.1%) compared to natural markers (24.2±3.7%) at sites downstream of the dam in Hanyuan. Further proportion studies revealed the contribution of sewage markers (31.6±12.8%) due to the low coverage of domestic sewage treatment plants in the residential area. Our study provides a certain theoretical basis for the coupling effect between the compositional change of OM pollution sources and the retention effect of the reservoir.
Fichier principal
Vignette du fichier
20230424Study on thedistribution characteristics of organic matter sources in surface sedimentsof reservoir.pdf (738.85 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04249172 , version 1 (02-11-2023)

Identifiants

Citer

Su Nin-Ren, Emilie Jardé, Yin Yuepeng, Marine Liotaud, Zhang Wen. Sedimentary organic matter of channel type reservoirs: input of lipid biomarker for source assessment. Journal of Lake Sciences, 2024, 36 (1), ⟨10.18307/2024.0126⟩. ⟨hal-04249172⟩
62 Consultations
37 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More