Abstract:Long-term trends and spatial patterns of water quality at 5 stations in the upstream of the Daling River basin of North China were examined for 5 parameters—pH, suspended sediment (SS), dissolved oxygen (DO), permanganate demand (CODMn) and biochemical oxygen demand (BOD5). Analysis determined the trends of parameters of each station between 1987 and 2007. The variations in permanganate demand and biochemical oxygen demand showed increasing trends and the variations in dissolved oxygen were decrease in 1990s. … Show more
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