小型景观湖泊眉湖水质分析及富营养化评价

Analysis of Water Quality and Evaluation of Eutrophication of Meihu Lake of Small Landscape Lake

小型景观湖泊已成为城市生态景观的重要组成部分,但因自身特点决定了其易受人为因素影响而导致水质变差,甚至丧失景观水体的功能,因此有必要研究小型景观湖泊的水质状况及其富营养化程度的影响因素。以郑州大学眉湖为例,进行多次定期水环境监测试验,在分析水质指标的时空分布及变化规律的基础上,分别采用单指标评价法和综合营养状态指数法评价其水体的水质状况及富营养化程度。结果表明,CODCr、BOD5、TP、TN、NH3-N等主要污染物的浓度与禽类、鱼类和水生植物的分布密切相关,在监测时段内眉湖整体水质状况呈恶化趋势,从中营养状态变为轻富营养状态。最后,有针对性地提出了改善策略和保护措施,以期为小型景观湖泊的运行管理提供依据和参考。

Small landscape lakes have become an important part of urban ecological landscape.However,they will get water quality deterioration or even lose the function of the landscape water affected by man-made factors.So,it is necessary to study the influencing factors for water quality and eutrophication of small landscape lakes.Choosing the Meihu Lake in new campus of Zhengzhou University as the research object,the water environmental monitoring experiments were carried out.Based on the analysis of spatio-temporal variation of water quality indicators,water quality of water body and degree of eutrophication were evaluated by using single index evaluation method and comprehensive nutrition state index method,respectively.Results show that the concentrations of CODCr,BOD5,TP,TN and NH3-N are closely related to the distribution of birds,fish and aquatic plants.In the monitoring period,the overall water quality condition of Meihu Lake appears a deteriorating trend and its trophic status changes from mesotropher state to light eutrophic state.Finally,some improvement strategies are put foward in order to provide guidance for the operation and management of small landscape lakes.