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[1]SHI Yao,ZHAO Yanmin,QIN Yanwen,et al.Spatiotemporal Distribution of Nitrogen Forms in Water in Different Scheduling Periods of the Three Gorges Reservoir[J].Research of Soil and Water Conservation,2021,28(06):9-16.

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Spatiotemporal Distribution of Nitrogen Forms in Water in Different Scheduling Periods of the Three Gorges Reservoir

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 06 Page number: 9-16 Column: Public date: 2021-10-10

Title:: Spatiotemporal Distribution of Nitrogen Forms in Water in Different Scheduling Periods of the Three Gorges Reservoir

Author(s):: SHI Yao^1,2，ZHAO Yanmin^1,2，QIN Yanwen^1,2，MA Yingqun^1,2，HAN Chaonan³，ZHANG Lei^1,2，YANG Chenchen^1,2，LIU Zhichao^1,2; (1.State Key Laboratory of Environmental Criteria and Risk Assessment，Chinese Research Academy of Environmental Sciences，Beijing 100012，China; 2.Water Environmental Management and Research Center，Chinese Research Academy of Environmental Sciences，Beijing 100012，China; 3.School of Civil Engineering，Nanjing Forestry University，Nanjing 210037，China)

Keywords:: Three Gorges Reservoir; nitrogen forms; reservoir scheduling periods; spatial distribution; seasonal distribution

CLC:: X524

DOI:: -

Abstract:: In order to explore the pollution characteristics of nitrogen form in the Three Gorges Reservoir，a combination of field surveys and laboratory experiments was used to systematically analyze the water quality monitoring data of eight sections of the Three Gorges Reservoir in four scheduling periods. The concentration and spatiotemporal distribution characteristics of different nitrogen forms were studied，and the correlations between different nitrogen forms and environmental factors were also studied in four scheduling periods of the Three Gorges Reservoir. The results indicated that the concentration of TN-N in water of the Three Gorges Reservoir were 1.45～5.34 mg/L，which exceeded the internationally recognized threshold level of eutrophication，TDN-N was the main chemical species of TN-N，DIN-N was the main chemical species of TDN-N，NO^-₃-N was the main chemical species of DIN-N; the distribution of nitrogen forms was significantly affected by pH value and EC of the water; significant positive correlations among TN-N，TDN-N and NO^-₃-N were found during the storage period，low water level period，and drainage period of the Three Gorges Reservoir，indicating that TN-N，TDN-N and NO^-₃-N might share the same source; similar patterns of spatial distribution in water were observed for TN-N，TDN-N and NO^-₃-N，and an upward trend and then a downward trend were found from the upstream Zhutuo section to Cuntan section; ammonium nitrogen(NH⁺₄-N)and nitrite nitrogen(NO^-₂-N)did not show significant change; spatial differences might be mainly attributed to the pollution input by human activities; similar patterns of seasonal distribution in water were observed for TN-N，TDN-N，NO^-₃-N and NH⁺₄-N，showing the following decreasing order: high water level period>low water level period; seasonal trend of NO^-₂-N was shown as the opposite. The seasonal changes might be mainly related to the operation mode of reservoir and seasonal factors such as temperature and rainfall.

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Last Update: 2021-10-10