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- W4200495536 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Methane (CH<sub>4</sub>) emissions from freshwaters to the atmosphere have a profound impact on global atmospheric greenhouse gas (GHG) concentrations. Anthropogenic footprints such as dam construction and reservoir operation significantly changed the fate and transport of CH<sub>4</sub> in freshwaters. The type of particulate organic carbon (POC) in reservoirs is a critical factor controlling CH<sub>4</sub> production and emissions. However, little is known of how reservoir operation mediates the distribution of POC and regulates CH<sub>4</sub> accumulation in cascade hydroelectric reservoirs. Here, spatial and temporal variations in POC and CH<sub>4</sub> were explored in the Xiluodu (XLD) and Xiangjiaba (XJB) reservoirs which are deep valley dammed cascade reservoirs located in the main channel of the upper Yangtze River. Based on the δ<sup>13</sup>C-POC and N / C mole ratios of particulate organic matter, the results of multi-endmember stable isotope mixing models by a Bayesian model show that terrestrial POC and autochthonous POC accounted for approximately 56 ± 19 % and 42 ± 19 % (SD, n = 181) of POC, respectively. CH<sub>4</sub> concentrations and δ<sup>13</sup>C-CH<sub>4</sub> in the cascade reservoirs were potentially influenced by CH<sub>4</sub> oxidation. Together with other physicochemical parameters and structural equation model, these results suggested that the input of terrestrial POC was dominantly influenced by water level variations and flow regulation due to reservoir operation. The cumulative effect of POC caused by cascade reservoirs was not apparent at a bimonthly scale. Terrestrial POC was more likely to dominate CH<sub>4</sub> accumulation in cascade reservoirs under reservoir operation." @default.
- W4200495536 created "2021-12-31" @default.
- W4200495536 creator A5023826377 @default.
- W4200495536 date "2021-12-03" @default.
- W4200495536 modified "2023-10-03" @default.
- W4200495536 title "Reply on RC2" @default.
- W4200495536 doi "https://doi.org/10.5194/bg-2021-234-ac2" @default.
- W4200495536 hasPublicationYear "2021" @default.
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