The goal of comprehensive evaluation of urban ecosystem health is the overall health level of the system. Through comprehensive evaluation, the health status of the system is judged, potential risk factors are found, health early warning is carried out, and necessary measures are taken to control and protect it. The contents of urban ecosystem health evaluation include: comprehensive evaluation of urban ecosystem structure health and comprehensive evaluation of functional health.
Urban ecosystem is a comprehensive system, which consists of natural environment, social economy, culture, science and technology. It includes buildings and other facilities as the basis of urban development, as well as residents and their activities as the main body of the city. Cities belong to artificial systems to a greater extent.
trait
Integrity. It means that once each element as a subsystem unit constitutes the whole system, it has properties and functions that independent elements do not have, forming a qualitative stipulation of the new system, thus indicating that the overall function is greater than the simple sum of the functions of each element. The essence and function of an open urban ecosystem is the exchange of material, energy and information with the external environment.
The opening of urban ecosystem to the environment is the premise and existence condition of system development. Keeping the communication channels between the city and the outside world smooth is very important for maintaining the health of the urban ecosystem. Variability Refers to the system from one state to another through instability, which is a basic form of system qualitative change.