Study On Ecological Security And Protection Strategies For Global Urbanization In Dalian

Since the launch of Reform and Opening-up in China, the urbanization process of Dalian has developed significantly. However, the central city region is still too small, which has become a key limiting factor to accelerate the construction of Dalian as three centers (i.e., international shipping center, logistics center and regional financial center). To solve this challenging problem, Dalian city government has proposed "Global Urbanization" development strategy.This dissertation has provided a comprehensive study on the ecological security during the urbanization process in Dalian. Based on the advanced3S technologies, system dynamics simulation methods and extension theory, this research has analyzed the ecological security from the perspective of both landscape pattern and ecological carrying capacity. We further present protection measurements in terms of socio-economic, land use and ecological carrying capacity, as well as suggestions on planning and practice for Dalian’s Global Urbanization.The contributions and main conclusions of this dissertation are summarized as follows.(1)Based on the results of remote sensing data interpretation, the landscape pattern has changed dramatically in20years in Dalian City. Specifically, the area of arable land and forest land obviously descended and the area of building land sharply ascended. We analysis and evaluate the current landscape ecology in Dalian with the landscape index methods. The results have shown that the degree of landscape fragmentation was severer and severer; the complete landscape landscape patch has been destroyed; and the dominance of building land has increased year by year in Dalian. By applying the CLUE-S model, the dynamic changes of land cover and landscape index during Dalian’s GU process are predicted. Numerical results have indicated that with the GU proceeding in Dalian, the percentage of building land will increase greatly; the percentage of forest land and arable land will decrease significantly; the degree of landscape fragmentation will be greater than present.(2)According to the system dynamics principle, ecological carrying capacity dynamic simulation model is constructed to predict the ecological carrying capacity after the realization of GU in Dalian. The predicted results have indicated that GU will strongly threat the ecological environment. Specifically, the usage degree of water resource, land resource and water environmental capacity are all greater than one, i.e., beyond the regional ecological carrying capacity of Dalian city.(3)A GU ecological security assessment indicator system is proposed by integrating AHP and fuzzy assessment approaches. Evaluation results have indicated that the ecological security level after GU is realized in Dalian will be worse than the inferior-to-average level at present.(4)Optimal ecological security and protection strategies are finally proposed based on the causality analysis of the ecological security threat due to GU implementation by using extension of the theory of extension planning combined with excellent degree evaluation method.