The Research On River Ecosystem Health Index System And Evaluation Method

Rivers are important natural ecological system,provide variety of ecosystem services for human being.With the rapid development of population growth and economic,ecological environment is severely affected,function of river ecosystem degradation,river ecosystem health and sustainable management of river have become one of the core issue of international attention.As a new management tool and technology,river ecosystem health has become the focus research of ecology,environmental science and water conservancy science.This paper adopts the method of combining theory and practice to study the establishment of river health evaluation index system and evaluation method.on the basis of the concept and connotation of river health in both domestic and abroad,four dimensions of 44 indicators model hypothesis based on the physical factor,quality factor,biological factor,functional factor are constructed.Take Liao River conversation area as an application,index data are obtained by using data collection,remote sensing,wild field monitoring method.Using four kinds of mathematical methods,the normal distribution,homogeneity test,reliability and validity to screening and analysis evaluate index data;By using the method of structural equation model to estimate model parameters and model fitting inspection and correction,a model based on biological and function of the river health evaluation of river is built,evaluation the River Liao conversation area ecosystem health condition.The main results were as follows:The conversation is in a health state as a whole.58.8% sampling section in the study area belongs to the health level,cross section includes: Fudedian,Sanhexiala,Tongjiangkou,Shuang An bridge,Cainiu,Fanhekou,Shifosi reservoir,Mahushan,Juliuhe,Shuguang bridge;41.2% cross section under sub health level,including: Hada high-speed rail rubber dam,Yubaotai,Manduhu,Hongmiaozi,Daniu,Dazhang bridge and Shuguang bridge.The research of this paper can provide theoretical basis and operational methods for Liao river conversation area and rivers in other parts of country for river ecosystem health evaluation.The evaluation results has important practical significance for guide the practice of the protection of river health.Authorities need to take the right way and countermeasure of reasonable regulationing the rivers.To eliminate or reduce the restricting factors of river health As far as possible.Let the river development towards the direction of healthy and orderly,raise the service function of the river of human society.