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Open AccessArticle

Spatio-Temporal Variation in Nutrient Profiles and Exchange Fluxes at the Sediment-Water Interface in Yuqiao Reservoir, China

1
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
3
Tianjin Hydraulic Research Institute, Tianjin 300061, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(17), 3071; https://doi.org/10.3390/ijerph16173071
Received: 11 July 2019 / Revised: 15 August 2019 / Accepted: 22 August 2019 / Published: 23 August 2019
(This article belongs to the Special Issue Mechanism and Control Technology of Lake Eutrophication)
Nutrients released from sediments have a significant influence on the water quality in eutrophic lakes and reservoirs. To clarify the internal nutrient load and provide reference for eutrophication control in Yuqiao Reservoir, a drinking water source reservoir in China, pore water profiles and sediment core incubation experiments were conducted. The nutrients in the water (soluble reactive P (SRP), nitrate-N (NO3-N), nitrite-N (NO2-N), and ammonium-N (NH4+-N)) and in the sediments (total N (TN), total P (TP) and total organic carbon (TOC)) were quantified. The results show that NH4+-N was the main component of inorganic N in the pore water. NH4+-N and SRP were higher in the pore water than in the overlying water, and the concentration gradient indicated a diffusion potential from the sediment to the overlying water. The NH4+-N, NO3-N, and SRP fluxes showed significant differences amongst the seasons. The NH4+-N and SRP fluxes were significantly higher in the summer than in other seasons, while NO3-N was higher in the autumn. The sediment generally acted as a source of NH4+-N and SRP and as a sink for NO3-N and NO2-N. The sediments release 1133.15 and 92.46 tons of N and P, respectively, to the overlying water each year. View Full-Text
Keywords: nutrient; pore water; flux; sediment-water interface; Yuqiao Reservoir nutrient; pore water; flux; sediment-water interface; Yuqiao Reservoir
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MDPI and ACS Style

Wen, S.; Wu, T.; Yang, J.; Jiang, X.; Zhong, J. Spatio-Temporal Variation in Nutrient Profiles and Exchange Fluxes at the Sediment-Water Interface in Yuqiao Reservoir, China. Int. J. Environ. Res. Public Health 2019, 16, 3071.

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