Objective To know the situation of the water environment in the Eling Lake Area and provide the theoretical basis for protecting the biosystem of this area. Methods The water samples were collected from the sites 0.5 meters below the water surface of input and output water area, the water area near the east and west bank of the Eling Lake, the center of the lake, and also from the sites 0.5 meters above the bottom of the lake .The water sampling was carried out in August 2005, October 2005 and May 2006. Country standard method was used to determine the physical and chemical characteristics of water samples. The sampling, determination and evaluation in the investigation were according to related standard regulations. Results The water temperature was 5.6 ℃, pH value was 8.49, the total amount of Ca2+ and Mg2+, suspended matter, chlorides, sulfate, DO, COD, BOD5, Cu2+ and Zn2+ were 95.4 mg/L, 87.0 mg/L, 45.0 mg/L, 80.0 mg/L, 7.1mg/L, 11.0 mg/L, 2.0 mg/L, 0.002 mg/L and 0.009 mg/L respectively. Conclusion All of the physical and chemical characteristics of the water samples meet the water quality criterion of the class ruled by GB 3838-2002, and the water can be used as source water.

Objective To know the situation of the water environment of Yangtse river of source area of Lantsang,Yellow and Yangtse River,and provide the theoretical basis for protecting the biosystem of this area. Methods Ten monitoring sections were selected in the investigated areas and the water samples were collected in May 2008,August 2008,October 2008 respectively. The sampling,determination and evaluation in the investigation were performed according to the related standard regulations. Results The water temperature was 8.5 ℃,pH value was 8.27,the index of KMnO4 was 0.73 mg/L,the concentrations of COD, BOD5, NH4-N, fluoride, sulfide, total phosphoric, Cr6+, phenol, Hg, petroleum were 9.1,2,0.334,0.166,0.02,0.03,0.004,0.002,0.000 01, 0.02 mg/L,respectirely; the count of fecal coliform