期刊
CHINESE SCIENCE BULLETIN
卷 59, 期 19, 页码 2348-2355出版社
SCIENCE PRESS
DOI: 10.1007/s11434-014-0153-5
关键词
Dam; Dissolved inorganic carbon; Carbon isotope compositions; Phytoplankton; Wujiang River
资金
- National Basic Research Program of China [2013CB956703]
- National Natural Science Foundation of China [41021062]
To determine the impact of damming on the geochemical behavior of dissolved inorganic carbon (DIC) in the Wujiang River basin, field measurements and samples were collected semimonthly for a year. The surface waters of the reservoirs contained concentrations of chlorophyll a up to 5.6 times higher than the upstream river. Compared with the entering waters, the contributions of HCO3 (-) and dissolved CO2 to DIC decreased, and the contribution of CO3 (2-) to DIC and the carbon isotopic composition of DIC (delta C-13(DIC)) increased in the surface waters of the reservoirs, while in the waters released, the DIC species showed reverse geochemical behaviors. The delta C-13(DIC) ranged from -10.2 aEuro degrees to 2.5 aEuro degrees, indicating that significant contributions were from carbonate weathering, photosynthesis, and respiration. After the damming of a river, the bioactivity of phytoplankton was enhanced, and this affected the geochemistry of DIC compared to an unimpacted river and delta C-13(DIC) can be used to discern these changes. High-frequency monitoring of river-reservoir systems is necessary to evaluate the efflux of CO2 and provide a better understanding of the carbon sinks and sources in the impounded river.
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