Water Ecological Environment Monitoring Network Of Yixing City Ecological Leading Area Evaluation And Optimization

As one of the most important river basins in China,the taihu lake basin is densely covered with river networks and has numerous lakes.During the "11th five-year plan" and "12th fiveyear plan" period,the state has carried out a demonstration study on water pollution control and management policies in the taihu basin through a major project of water pollution control and treatment science and technology,and initially established a water ecological environment function zoning management system in the taihu basin of jiangsu province.However,at present,there is a lack of targeted and typical research on the assessment of water ecological health,and there is also a lack of experience in the optimization of water ecological environment monitoring network.Therefore,there are few studies on water ecological environment monitoring network based on water ecological function division in small-scale regions.The study on the optimization of water ecological health assessment and monitoring points in yixing city in the taihu lake basin,combined with the important position of yixing city as a leading ecological protection zone,can radiate its influence to surrounding areas,which can provide support for the deepening of environmental governance in the taihu lake basin.According to the water quality and water ecological monitoring status,water ecological function division,administrative division and other factors in yixing eco-leading area,this paper conducted water ecological environment monitoring in 8 water ecological function divisions in the eco-leading area,and carried out water ecological environment monitoring in rivers and lakes on 79 key sections.According to the monitoring results of water ecology,the comprehensive pollution index method of river wate5 r quality and the comprehensive nutrient status index of lake reservoir were used to evaluate and analyze the health status of river water quality and lake reservoir.On the basis of evaluating the health status of water quality,the health status of water ecology was evaluated and analyzed by calculating the health index of water ecology.According to the monitoring points,the overall water ecological health status of the eco-leading area of yixing city is in a "medium" state.Among the 79 actual monitoring points,12 are rated as good,accounting for 15%.There are 53 of them,accounting for 67%;There were14 general grades,accounting for 18%.From the point of water ecological function areas,water ecological health : ecological class I areas > ecological class II > ecological level III area,lake reservoir water ecosystem health as a whole is better than that of river ecosystem health,the ecological function areas river and lake water reservoir water ecological health mainly,the relatively poor water ecological status of monitoring points are mainly concentrated in III-11 district,the main reason is that large freshwater benthic invertebrates and planktonic algae integrity index is low,aquatic ecosystem condition was poor.Then,the multi-index monitoring parameters are converted into a single index parameter that can comprehensively reflect the water quality by using the method of proximity degree.After clustering according to the similarity between monitoring points,the water ecological health assessment status is combined to optimize the arrangement of water ecological monitoring points.After the double sample t test and the variance double sample test,there is no significant difference between the optimization point and the substitution point.Finally,combined with the current situation of water ecological health assessment and the needs of water ecological environment management in taihu basin,the countermeasures and Suggestions to improve the water ecological health in yixing city’s ecological leading area were put forward.