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Changes of the concentrations of CODMn, BOD5 and NH3-N from main sections of the middle and upper reaches of East River were identified, by using the method of seasonal Kendall test for water quality data from Longchuan, Heyuan and Boluo monitoring stations during 2001-2007. The results suggest that: (1) the concentrations of BOD5 increase significantly at all stations; (2) the concentrations of CODMn and NH3-N do not display a significant trend at Longchuan control section, and the concentrations of CODMn showed a decreasing trend and NH3-N showed an increasing trend at both Heyuan and Boluo control sections; (3) change in the rate of water quality from the middle reaches is larger than that from the upper reaches; (4) the water quality change is mainly influenced by the change of waste discharge.

The characteristics of water quality change for the main control sections in the middle and upper reaches of East River