| 丹江口水库典型入库支流氮磷动态特征研究 |
| 摘要点击 2888 全文点击 1494 投稿时间：2011-11-18 修订日期：2012-03-12 |
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| 中文关键词 丹江口水库 入库支流 库湾 水质 氮磷比 富营养化 |
| 英文关键词 Danjiangkou Reservoir input tributaries river mouth area water quality nitrogen to phosphorus ratio eutrophication |
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| 中文摘要 |
| 重污染的神定河(接收城市污染)、中污染的大柏河(接收城镇污染)以及轻污染的五龙池(接收轻微农业面源污染)是丹江口水库3条典型入库支流. 在2010年4月~2011年4月对这3条入库支流及其河口水质监测的基础上,分析了水中氮、磷的动态变化特征,并利用综合营养状态指数法对其营养状态进行评价. 结果表明,神定河的TN、TP全年浓度均值分别为11.63 mg·L-1、0.93 mg·L-1,与五龙池(TN为4.41 mg·L-1,TP为0.076 mg·L-1)相比分别超过3倍和12倍; 大柏河的TN、TP全年浓度均值分别为4.79 mg·L-1、0.15 mg·L-1,略高于五龙池中TN、TP浓度均值. 3条支流及其河口中营养盐的时间差异为TN浓度在丰水期低于枯水期,而多数支流中TP浓度在枯水期低于丰水期. 神定河中NH4+-N占TN的质量分数高达69%,其它支流及河口中NH4+-N占TN的质量分数均低于20%. NO3--N 浓度变化范围为1.3~2.7 mg·L-1,SRP占TP的质量分数为30%~45%. 神定河及其河口氮、磷营养元素比例关系研究表明神定河总体处于氮限制状态,河口总体处于磷限制状态. 综合营养状态指数评价显示3条典型污染入库支流及其河口都处于富营养化状态,轻污染的五龙池的入库河口(东库湾)处于轻度富营养化状态. |
| 英文摘要 |
| Three representative input tributaries of Danjiangkou Reservoir in the upper reach of Hanjiang River, the largest tributary of Yangtze River, were selected for annual water quality monitoring from April 2010 to April 2011, to analyze dynamic characteristics of nitrogen (N) and phosphorus (P) in the river mouth areas, and then to assess the states of nutrition by comprehensive trophic level index. The results showed that the annual average concentrations of total nitrogen (TN) and total phosphorus (TP) in Shendinghe River, receiving both industrial and domestic wastewater from Shiyan City, were 11.63 mg·L-1 and 0.93 mg·L-1, which were 3 times and 12 times higher respectively comparing to that of Wulongchi stream that received little agricultural non-point source pollution. While for Dabaihe River, polluted by moderate agricultural non-point source pollution combining with waster water from a small town, had slightly higher TN and TP concentrations than that of Wulongchi stream. In temporal scale, TN concentrations during the flooding season were higher than those during the dry season, while the situation was opposite for TP. The mean mass fraction of NH4+-N/TN was 69% in Shendinghe River, while 20% less than others. As for nitrate nitrogen (NO3--N), it ranged from 1.3 to 2.7 mg·L-1 and the mass fractions of SRP/TP varied from 30% to 45%. All of these three tributaries were in the state of eutrophication, and nutrition stoichiometry analysis revealed that Shendinghe River was in the state of nitrogen limitation, while the river mouth area stayed in phosphorus limitation. |
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