关键词: 生态安全, 沿海城市, 生态系统, 稳定性, 生态网络分析方法

Abstract: This paper introduces the research theory on stability of the ecological system into the assessment research on the ecological safety system. Taking the ecological safety systems in the coastal cities along the Chinese three seas as the research focus, this paper is to analyze the operational mechanism of ecological safety systems, and identifies the flow paths and intensity of the material and energy within these systems. Based on the verified structure of the ecological safety systems and the function coefficients, this paper employs the ecological network analysis method（ENA）to build up the material and energy flow dynamical equations for ecological safety systems and to measure the assessment indicators (channel capacity, system polymerization, system redundancy) on the stability of the ecological safety system in order to conduct an assessment and comparison on the ecological safety systems in the coastal cities. The results show that the ecological safety systems have exposed the differences in their framework structure and build up their own flow networks of materials and energy along these three seas. At the same time, a study shows based on comparison analysis of the stability of the ecological safety systems in the coastal cities along these three seas: the ecological system along the South China Sea is at the stage of mature stability, that along the East China Sea at the stage of developing stability and along the Bo-Yellow Sea at the stage of initial instability.

Key words: Ecological Safety, Coastal City, Ecological System, Stability, Ecological Network Analysis