Abstract

Evaluation on ecological environment system is to describe and assess the quality of ecological environment, and accurately reflect the ecological environmental quality and pollution situation. In this paper, after reviewing the domestic and foreign relative researches, from the theory perspective of the dissipative structure of complex system, we analyzed the city ecological system dissipative structure characteristic, and discussed the process forming dissipative structure, then we constructed the city ecosystem entropy parameter table and entropy evaluated model. The total entropy dynamic, scientifically reflects the city ecology system level and developing trend, so in fact it provides the theory basis and method to improve the overall quality of ecological environment, finally we took Dangyang as a case study, and got the same conclusion with the actual situation.

Highlights

  • City ecological system is the important carrier of human society and economic development, and is the closest system related to the human life

  • Prigogine (Prigo gign) presented dissipative structure theory based on open system, he used the non balanced perspective, to study the entropy phenomenon in organic and inorganic, social and economic system, and pointed out that, in open systems, due to the negative entropy flows, it can compensate the increase of positive entropy of internal system (Neh Corris, Prigogine, 1992)

  • Entropy theory is the research about the evaluation of system effectiveness, it dynamic reflect system evolution process and development trend, in which, the increase of entropy reveal that the closed system irreversible caused the disorder and low efficiency due to interaction affection of each element, in the same time, dissipation theory reveals that a open system which is far from equilibrium state, through material and energy exchange process with external environment, open system will be from initial chaos state to the stable and orderly organizational structure and system efficiency is increasing

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Summary

Introduction

City ecological system is the important carrier of human society and economic development, and is the closest system related to the human life. Due to rapid population growth, rapid economic development as well as the irrational exploitation and utilization, ecological balance is being destroyed, and the ecological environment is deteriorated, which seriously troubled the city development. How to effectively control the deterioration of the city’ ecological environment, and how to attain sustainable development have became a popular issue of city’ development. To carry out the evaluation of city’ ecological environment is to grasp the suitability and its variation trend, and reveal the reason of the ecological environment’ damage or degradation, seek the method and way to improve and enhance the quality of ecological environment, which provides a scientific basis and policy support for ecological environment protection, and stimulate coordinated development on region economy, resources and environment

The Foreign Research Status
The Domestic Research Status
The Theory of Dissipative Structure
Dissipative Structure Characteristics of City
Evaluation Model on City Ecosystem Dissipative Structure Entropy
City Ecosystem Evaluation Index Selection
Construction City Ecological System Entropy Evaluation Model m
Empirical Study on the Evaluation of City Ecological System
Summary

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