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-N), nitrite-N (NO-N), and ammonium-N (NH-N)) and in the sediments (total N (TN), total P (TP) and total organic carbon (TOC)) were quantified. The results show that NH-N was the main component of inorganic N in the pore water. NH-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-N, NO-N, and SRP fluxes showed significant differences amongst the seasons. The NH-N and SRP fluxes were significantly higher in the summer than in other seasons, while NO-N was higher in the autumn. The sediment generally acted as a source of NH-N and SRP and as a sink for NO-N and NO-N. The sediments release 1133.15 and 92.46 tons of N and P, respectively, to the overlying water each year.
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| http://dx.doi.org/10.3390/ijerph16173071 | DOI Listing |
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