观山湖湿地公园水体中氮·磷分布及富营养评价

目的]评价观山湖湿地公园水体质量。方法]以观山湖湿地公园水体为研究对象,通过不同时期的采样监测,研究湿地水体氮、磷的时空变化特征,并运用营养状态指数法对水体富营养化状态进行评价。结果]湿地水体中氮、磷无明显的空间分布特征,但有明显的时间分布特征,TN浓度丰水期大于平水期,TP浓度丰水期小于平水期;2014—2016年除下湖的TN浓度呈下降趋势外,下湖的TP浓度和上湖的TN、TP浓度均呈增加趋势。富营养化评价综合指数表明,观山湖湿地水体在时空尺度上均处于轻富营养化状态,且磷为湿地水体的营养盐限制性因子。结论]为防止观山湖水体进一步富营养化,应控制氮、磷的引入,尤其是磷的引入。

Distribution of Nitrogen and Phosphorus and Eutrophication Assessment in Water Body of Guanshan Lake Wetland Park

Objective] To evaluate water quality of Guanshan Lake Wetland Park.Method] In view of Guanshan Lake Wetland Park as the research object,by sampling in different periods,the temporal and spatial variation characteristics of nitrogen and phosphorus in the wetland water were studied,the eutrophication status of the water body was evaluated by method of the trophic state index.Result] The results showed that nitrogen and phosphorus in the wetland water had no obvious spatial distribution,but had a significant time distribution.The nitrogen concentration in wet period was greater than that in normal water period,but the phosphorus concentration in wet period was less than that in normal water period.TN concentration in the lower lake showed a downward trend,but the content of TP in the lower lake and the content of TN and TP in the upper lake was increased during 2014-2016.Water eutrophication degrees of Guanshan Lake were all the light level at both temporal and spatial scale,but phosphorus concentration was the limiting factor of nutrients in wetland water.Conclusion] In order to prevent further lake eutrophication,nitrogen and phosphorus should be controlled,especially the introduction of phosphorus.