RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (02): 289-296.doi: 10.11870/cjlyzyyhj201702015

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TEMPORAL VARIABILITY OF WATER QUALITY IN POYANG LAKE OUTLET AND THE ASSOCIATED WATER LEVEL FLUCTUATIONS: A WATER QUALITY SAMPLING REVELATION

LI Bing1,2, YANG Gui-shan1, WAN Rong-rong1, LIU Bao-gui1,2, DAI Xue1,2, XU Chen1,2   

  1. 1. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-05-30 Revised:2016-07-26 Online:2017-02-20
  • Supported by:
    State Key Development Program for Basic Research of China (2012CB417006);National Natural Science Foundation of China (41271500、41571107)

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Abstract: A combination of weekly concentrations of three water quality parameters including dissolved oxygen (DO), ammonia (NH4+-N) and chemical oxygen demand (CODMn) for water samples in Poyang Lake outlet during 2004-2014, and corresponding hydrological data were analyzed. Results indicated that DO, NH4+-N and CODMn did not demonstrate significant inter-annual trends, while remarkable seasonal variations were observed, and notable negative correlation was found between DO, NH4+-N and CODMn and water level fluctuation, with Pearson coefficients of -0.63, -0.67 and -0.36, respectively. The dataset was further split into lake phase and river phase based on characteristic water level of 14 m. Probability density analysis revealed that in lake phase, there was 93% probability that the NH4+-N concentration would be lower than 0.25 mg/L, while for river phase, the probability went down to 32.8%. Similar results were also obtained for CODMn and DO. In general, the water quality of Poyang Lake outlet was more prone to be better in the lake phase than that in the river phase, further indicating that the dilution effect of high water level was decisive for the variability of water quality in Poyang Lake outlet. Finally, a quite strong autocorrelation of DO and NH4+-N was found and the water quality sampling for DO, NH4+-N and CODMn must be different. DO and NH4+-N can be monitored monthly or bimonthly, while CODMn must be sampled with more frequency, e.g. weekly or biweekly.

Key words: Poyang Lake outlet, water quality, variation trend, water level fluctuations, sampling frequency

CLC Number: 

  • P95
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