Data from: Investigation of nitrogen and phosphorus contents in water in the tributaries of Danjiangkou Reservoir

.As part of the efforts to ensure adequate supply of quality water from
Danjiangkou Reservoir to Beijing, surface water were sampled from the
tributaries of Danjiangkou Reservoir in normal (May), flood (August) and
dry (December) seasons of 2014, and characterized for nitrogen and
phosphorus contents as specified in the applicable standards. Test results
indicated that 1)the organic pollutions in Sihe and Shendinghe rivers were
more serious than those in other tributaries, and the concentrations of
nitrogen and phosphorus favoured the growth of most algae; 2) total
phosphorus (TP), total nitrogen (TN) and dissolved inorganic nitrogen
(DIN) were in the forms of dissolved phosphorus (DTP), dissolved nitrogen
(DTN) and nitrate nitrogen (NO3-N) in these seasons, respectively; 3)
compared with nitrogen, phosphorus was more likely to block phytoplankton
overrunning; 4)TN, TP, permanganate index (CODMn) and other ions were
positively correlated. These findings provided an important basis for the
effective measures taken later on as appropriate to ensure adequate supply
of quality water from Danjiangkou Reservoir to Beijing.