泗河水体氮磷空间分布及富营养化评价

Temporal Variation of Nitrogen and Phosphorus and Eutrophication Assessment in Sihe River

分析了泗河水体中TN和TP的空间变化规律,利用对数型幂函数普适指数公式对其水体营养状态进行了评价.结果表明,泗河水体中TN的平均质量浓度为6.22mg·L-1(NO-3-N占34.20%),TP为0.33mg·L-1.泗河水体中氮、磷空间分布特征明显,TN和NO-3-N的空间分布比较一致,均由上游开始先升高后降低的趋势,而NH+4-N稍有不同,无明显的变化趋势;TP和SRP含量由上游开始先降低后升高,分别至泗河大桥断面(1-8#)和金口坝断面(1-9#)达到最高值,然后又逐渐降低.总体来看,泗河处于"富"营养状态(EI=48.757).其中,3个断面(15.80%)处于"中"营养状态,13个断面(68.42%)处于"富"营养状态,3个断面(15.80%)处于"重富"营养状态.综合分析表明,工业废水和生活污水的点源污染是泗河污染的主要来源,畜禽养殖和农业面源污染应引起高度重视.

Based on the water quality survey in October 2013,the spatial distribution characteristics of total nitrogen （TN）and total phosphorus （TP）in Sihe River water were analyzed,and the trophic state was also assessed.The results showed that the average concentrations of TN was 6.22 mg·L-1 （NO-3-N, 34.20%）;He TP was 0.33 mg·L-1 .Various forms of TN and NO-3-N concentrations almost had a similar change by sections that both firstly increased from the upper Sihe basin and then decreased;while NH＋4-N had no significant change in all sections.The concentrations of TP and SRP were firstly decreased from the upper Sihe basin and suddenly increased to the highest value in the Sihe River Bridge section and Jikou dam respectively and then gradually reduced.Generally,the water quality of Sihe River had reached eutrophic state （EI=48.757）,among which,three sections were in mesotrophic state,thirteen sections were in eu-trophic state,while three sections were in hyper-eutrophic state.Integrated analysis indicted that point pol-lution,such as industrial wastewater and domestic sewage was still the main influence factors of water quality in Sihe River,meanwhile,livestock and poultry breeding and agricultural non-point pollution should be paid more attention.