Study On Model And Construction Of The Cluster-Composed City's Eco-spatial Structure

With the regionalization development of China's major cities, a new urban spatial structure in our country more and more can be rendered, whose prominent feature is that the spatial growth of urban regional areas no longer spreads in the manner of overflow type and the way the pie, but more in the way of relying on the communication lines to develop the urban functional groups, so that urban spatial structure and morphology shows the cluster-composed features of "Axial + group"; we call it "cluster-composed city."As major cities in regional development , cluster-composed cities will make a great impact on the regional natural ecological environment in the process of their spatial expansion.And, how to reduce the negative impact which they bring, while ensuring the operating efficiency of cluster-composed city, is the prominent problem that cluster-composed cities in rapid development are facing.For the problem, the paper chooses the urban eco-spatial structure as the perspective to carry out a preliminary study.First, the paper defines cluster-composed city in the turn of the characteristics of major cities'regionalization development in china, and then divides it into two kinds of cluster-type urban-styles, basing on the differences of urban spatial structure in cluster-composed city.Meanwhile, the paper also defines the concept of its urban eco-space, urban eco-spatial structure and urban eco-spatial structure model.Later, the paper sums up two basic eco-spatial structure models of cluster-composed city after making a summary of the cases about the typical urban eco-spatial structures in cities both at home and abroad .On this basis, according to the relevant principles of landscape ecology, the paper proposes the ideal model of eco-space structure of cluster-composed city, and then carries on a demonstration combined with examples.And with regard to the construction of urban eco-spatial structure of cluster-composed city, the paper presents target system and principles of the construction, and conducts a preliminary study on two basic links of the construction(the mosaic relationship analysis between urban eco-space and construction space of cluster-composed city as well as the network of urban eco-spatial structure). Finally, combined with earlier studies, the paper chooses Wuhan and Dongguan, as the representatives of two types of cluster-composed cities, and carries out an empirical research on the construction of urban eco-spatial structure of cluster-composed city, with a view to exploring and testing the construction methods and strategies of urban eco-spatial structure in practice.