Beijing Urban Ecosystem Health Assessment Research

City ecological system is a complex giant system.As an important part of city system,its health directly affects the sustainable development of the city.The city ecological health evaluation system is an important way to measure the health level of city ecosystem,but the influence of city ecosystem complexity and uncertainty of the city ecosystem health.The evaluation is full of uncertainty,so the existing city ecosystem health assessment in a particular city is often the model object of study to establish the city ecosystem health assessment using some research methods.But there are often differences between models,and has not yet formed a unified evaluation system.This paper takes the city ecological system in Beijing as the research object.The city ecosystem health related concepts are analyzed,and it studied the basic characteristics of healthy city ecosystem,health evaluation content and health evaluation method;following the typical,accessibility,scalability,simplicity principle.And it establishes the system structure of Beijing city ecosystem health assessment,consisting of 5 elements of the city ecological system for the two indicators,according to the main influencing factors of health evaluation.Finally,it is screened 55 specific evaluation index as the main evaluation system;based on a data set from the statistical yearbook of Beijing City,statistical bulletin of national economic and social development,environmental quality bulletin data.Then it determines the weight of the corresponding index,and put forward the city ecosystem health index.The results of the study showed that the health level of city ecosystem in Beijing in recent years continued to enhance stably and there are some differences between the result and ecological environment index(EI).But then maintain the basic trend of approximation.Using the data analysis technology,the restrictive factors of the healthy development of Beijing ecological city the systemare analyzed,according to the economic,industrial structure,urban spatial growth model,biological health level,the ability to restore the city ecology,environmental protection and other 5 types the analysis of the main influencing factors.Finally,the corresponding countermeasures are put forward based on the Beijing city ecosystem health standard,by the concept of development,economic development,ecological monitoring,environmental governance and other aspects.