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

Shuailong Wen, Tao Wu, Jie Yang, Xue Jiang and Jicheng Zhong
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Shuailong Wen: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Tao Wu: Tianjin Hydraulic Research Institute, Tianjin 300061, China
Jie Yang: Tianjin Hydraulic Research Institute, Tianjin 300061, China
Xue Jiang: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Jicheng Zhong: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China

IJERPH, 2019, vol. 16, issue 17, 1-16

Abstract: 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 (NO 3 − -N), nitrite-N (NO 2 − -N), and ammonium-N (NH 4 + -N)) and in the sediments (total N (TN), total P (TP) and total organic carbon (TOC)) were quantified. The results show that NH 4 + -N was the main component of inorganic N in the pore water. NH 4 + -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 NH 4 + -N, NO 3 − -N, and SRP fluxes showed significant differences amongst the seasons. The NH 4 + -N and SRP fluxes were significantly higher in the summer than in other seasons, while NO 3 − -N was higher in the autumn. The sediment generally acted as a source of NH 4 + -N and SRP and as a sink for NO 3 − -N and NO 2 − -N. The sediments release 1133.15 and 92.46 tons of N and P, respectively, to the overlying water each year.

Keywords: nutrient; pore water; flux; sediment-water interface; Yuqiao Reservoir (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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