Exploring coupling coordination between urbanization and ecosystem quality (1985–2010): a case study from Lianyungang City, China
Junyong AI, Lan FENG, Xiaowei DONG, Xiaodong ZHU, Yangfan LI
Exploring coupling coordination between urbanization and ecosystem quality (1985–2010): a case study from Lianyungang City, China
Urbanization processes affect the ecosystem through alterations in ecological functions and landscape patterns. Currently, analysis of the total ecosystem services value (ESV) has targeted the overall benefits which human beings obtain from the regional ecosystem but does not generally include information regarding ecological structures and patterns. Therefore, the results cannot reflect the comprehensive state of the local ecosystem. We propose a new, integrative ecosystem quality indicator based on the ESV and landscape metrics for evaluating the quality of the regional ecosystem. We adopted the method of a coupled degree of coordination for evaluating the interrelationship between urbanization and ecosystem quality in Lianyungang City from 1985 to 2010. The coupling degree of coordination between urbanization and ecosystem quality showed an inverse U-shaped curve. At the primary stage of urbanization (1985‒1995), the degree of coupling of urbanization and the ecosystem was just barely balanced. From 1995 until 2000, the coupling system reached a balanced condition, in which the urbanization level increased. Since 2000, the urbanization process has accelerated. The coordination between urbanization and the ecosystem achieved the optimum condition in 2005. A turning point appeared at the same time, and the degree of coupling coordination began falling from the optimum. Subsequently, the coupled system once more entered a barely balanced state. Overall, the comprehensive level of ecosystem quality decreased since 1985 and degraded sharply after 2005, suggesting an overall degradation of the local ecosystem quality.
urbanization / ecosystem services value / land use change / landscape metrics / ecosystem quality
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