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Distributions and retention of nitrogen and phosphorus in Panjiakou Reservoir

1 1 1 1 1 2
YU Xiao ，LI Guoqiang ，ZHUGE Yisi ，DU Qiang ，LIU Xiaobo ，ZHAO Chong
（1. China Institute of Water Resources and Hydropower Research，Beijing 100038，China；
2. Huadong Engineering Corporation Limited，Hangzhou 310014，China）

Abstract： Panjiakou Reservoir is an important water source in North China，which plays an important role
in ensuring regional water supply security. This paper systematically analyzes spatial-temporal variation char⁃
acteristics and retention of nitrogen and phosphorus in Panjiakou Reservoir since its construction. The re⁃
sults show that the TP concentration of the reservoir has been on the rise since the reservoir was construct⁃
ed，with a maximum of 0.37mg/l. The TN and nitrate concentration of the reservoir are relatively high with
little interannual change. The average concentrations in the past 15 years are 4.4mg/l and 3.5mg/l respective⁃
ly. And the ammonia nitrogen concentration is basically lower than 0.5mg/l. The nitrogen and phosphorus in
the reservoir area are mainly retained， and their concentration are mainly affected by inflow concentration.
The retention efficiency of phosphorus is decreasing， and the retention efficiency is -6% in the past five
years. The retention efficiency of ammonia nitrogen has been higher，and the retention efficiency is 72% in
the past five years. The retention efficiency of nitrate is increasing， which is 20% in recent five years，
and the retention effect of nitrate and phosphorus is negatively correlated. Combined with the analysis of ver⁃
tical water quality monitoring，it shows that there have been significant release of internal pollution and de⁃
nitrification at the bottom of the reservoir in recent years. The sediment pollution of Panjiakou Reservoir is
serious， and the internal pollution will be the potential risk of water quality deterioration in the future. In
order to ensure the water quality of the reservoir and restrain the release of the internal pollution，it is sug⁃
gested that the reservoir keep the high water level as much as possible.
Keywords：Panjiakou Reservoir；total phosphorus；total nitrogen；retention effect；internal pollution

（责任编辑：祁 伟）

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