CH production and oxidation of sediments in the typical tributary of Three Gorges Reservoir
Hupo Kexue/Journal of Lake Sciences, ISSN: 1003-5427, Vol: 35, Issue: 5, Page: 1670-1681
2023
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Article Description
In order to study the extent of CH release at the sediment-water interface (SWI) of the tributary bay of the Three Gorges Reservoir (TGR), CH production and oxidation at the SWI and its regulators in the Xiangxi Bay were investigated by combining in situ sampling and indoor incubation with sediment characteristics and environmental factors. The results showed that; (1) During the discharge period of the TOR, the potential sediment CH production rale (MPs) (6.35-2029.37 mg/(kg*d)), CH production fluxes (MP, 0.04-0.73 mmol/(m -d)) and oxidation fluxes (MO, 0.03-0.62 mmol/(m *d)) at the SWI showed spatial variations among several transections and increased from downstream (XX00) to upstream (XX07). (2) Vertically, the CH production rate decreased with increasing sediment depth, and MPs from the lop 20 cm of sediment can be used to estimate sediment MPs in the bay, which accounted for 70% (55%-82%) of the total CH production from the intact sediment core (between 20 cm and 36 cm in length). (3) MP at the SWI was positively and linearly related to sediment total organic carbon, but negatively related to water depth. MP and MO showed a very significant positive correlation with increasing temperature, resulting in higher CH emission corresponding to a linear decrease in methane oxidation rate (MR). Accordingly, the sediment MR in Xiangxi Bay reached 96.62% during the discharge period of the TOR, indicating low CH emission from sediments.
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