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.

为保障丹江口水库向北京输送优质足量供水的目标，本研究于2014年平水期（5月）、丰水期（8月）与枯水期（12月）采集了丹江口水库支流的地表水样品，并依据相关标准对样品中的氮、磷含量进行了表征分析。测试结果表明：1) 泗河与沈定河的有机污染程度显著重于其他支流，且氮、磷浓度适宜多数藻类的生长繁殖；2) 各水文时期中，总磷（Total Phosphorus, TP）、总氮（Total Nitrogen, TN）与溶解态无机氮（Dissolved Inorganic Nitrogen, DIN）的主要存在形态分别为溶解态磷（Dissolved Phosphorus, DTP）、溶解态氮（Dissolved Nitrogen, DTN）与硝酸盐氮（Nitrate Nitrogen, NO3-N）；3) 相较于氮元素，磷元素更易抑制浮游植物的过量增殖；4) 总氮（TN）、总磷（TP）、高锰酸盐指数（Permanganate Index, CODMn）与其他离子间均呈显著正相关。上述研究结果为后续针对性制定有效管控措施、保障丹江口水库向北京输送优质足量供水提供了重要科学依据。