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| Variation of surface water quality in Sheyuchuan small watershed of Miyun County |
| Wu Jingdong1,2, Zhang Hongjiang1, Duan Shuhuai3, Ye Zhihan2, Yi Zuoming2 |
| 1. College of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing; 2. Beijing Hydraulic Research Institute, 100048, Beijing; 3. Beijing General Working Station of Soil and Water Conservation, 100038, Beijing：China |
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Abstract To provid theoretical basis for construction of ecological and clean watershed, protection of water resource and ecological environment construction, temporal and spatial variation of surface water quality were analyzed by using data monitored in last five years in Sheyuchuan small watershed of Miyun County. The results show that the mass concentration of NH3-N in river water changed greatly in spring and winter, while it was stable after midsummer. The mass concentration of TN, TP and CODMn were lower in spring and winter, but increased significantly during flood season in summer. After rainfall ended in autumn, the value of each index decreased. In small reservoir, the mass concentration of both NH3-N and TN were realtively higher in winter and lower in summer, while mass concentration of TP and CODMn were higher both in summer and winter. In general, the quality of surface water in small watershed was good except some area. NH3-N belongs to Class Ⅰ-Ⅱ, TP belongs to Class Ⅱ, CODMn belongs to Class Ⅱ-Ⅲ.
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Received: 08 September 2011
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