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| Nitrogen pollution and its influencing factors in groundwater in upper-river basin of Miyun Reservoir |
| Received:July 15, 2015 |
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| KeyWord:NO3--N;NH4+-N;geo-statistic method;land use |
| Author Name | Affiliation | | LU Yin-tao | School of Civil Engineering, Beijing Jiaotong Universtity, Beijing 100044, China
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China | | LENG Pei-fang | School of Civil Engineering, Beijing Jiaotong Universtity, Beijing 100044, China
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China | | QIN Wei | School of Civil Engineering, Beijing Jiaotong Universtity, Beijing 100044, China
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China | | CHANG Tian-qi | School of Civil Engineering, Beijing Jiaotong Universtity, Beijing 100044, China
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China | | LIU Fang | School of Civil Engineering, Beijing Jiaotong Universtity, Beijing 100044, China
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China | | YAO Hong | School of Civil Engineering, Beijing Jiaotong Universtity, Beijing 100044, China
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China |
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| Abstract: |
| The Miyun Reservoir is the sole source of drinking water for Beijing residents, and the groundwater is the primary water supply source of the Miyun Reservoir. Therefore, nitrogen in the groundwater would critically affect the water quality of the Miyun Reservoir. We collected groundwater samples in an upper basin of the Miyun Reservoir in July, 2014 and January, 2015. Spatial-temporal distributions of NO3--N, NO2--N and NH4+-N in the groundwater and influencing factors, such as land use and groundwater level, and relation between surface water and groundwater of nitrogen were investigated using domain identification method and geo-statistic method. Concentrations of NO3--N in 29.73% of the total samples ranged between 10 mg·L-1 and 20 mg·L-1, and those in 27.03% samples exceeded 20 mg·L-1, implying N pollution in the studied area. The spatial variation of NH4+-N in the groundwater had little pattern while NO3--N pollution mainly occurred around towns or villages with dense population. The percentages of water samples containing NO3--N above the national standards increased from 2.3% in 2008 to 25.71% in 2014. Seasonally, NO3--N concentrations were higher in the wet season than in the dry season. In addition, NO3--N and NO2--N concentrations in the groundwater decreased with increasing depth of groundwater level, and NO3--N concentrations in groundwater increased from upstream to downstream. |
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