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| Changes of water quality in typical sites along upstream of Fen River |
| Li Junying1,Li Suqing2,Han Jintao2 |
| 1.College of Forestry of Shanxi Agricultural University,030801,Taigu, Shanxi; 2.Institute of Loess Plateau,Shanxi University, 030006,Taiyuan:China |
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Abstract In order to reveal the effect of water quality along upstream of Fen River on regular water supply to residents in Taiyuan, the capital city of Shanxi Province, the history of water quality over 25 years from 1985 to 2010 was investigated in this study. The water samples were collected from five sites, four villages (Toumaying, Ninghua, Dongzhai, and Hecha) along the river and Fen River Reservoir upstream. Single factor evaluation method and index method were used to evaluate the water quality. Results showed that：1）The water quality deteriorated significantly in the upstream area around 2002. For most water samples, quality grade increased from level II or III to level IV or above. High percentage of samples around Ninghua and Hecha areas showed grade lower than level III, whereas Fen River Reservoir showed water quality around level II or III. The deterioration of water quality was mainly due to the increase of concentration of salt permanganate index, BOD5 and NH+4-N resulted from coke burning, coal washing and heavy use of fertilizers. 2) Salt permanganate index and NH+4-N showed increasing trend for the water quality upstream of Fen River, mainly due to the low efficiency of decomposition of inorganic and organic pollutants caused by high concentration of nitrite in the water. 3) The general change of the water quality in the upstream area of Fen River occurred to the concentration and varieties of organic pollutants, showing increased level of eutrophication and water hardness, mainly due to increased consumption of water and inappropriate waste treatment. In general, the water quality upstream of Fen River has been deteriorating, it should be the main focus to take all measures to protect the water environment upstream of Fen River.
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Received: 29 December 2010
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| Fund: 国家林业局948项目“河溪植被缓冲带恢复综合技术引进”(20060415)；山西大学科学科研启动费资助 |
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