Abstract:

Public service facilities land is the main part of urban land system. The agglomeration and diffusion of it can reveal the evolution of urban spatial structure and urban center features in a more direct way. This paper focuses on the central city of Changchun. Using GIS software and topographic data and urban land use maps from 2003 to 2013, we calculate the kernel density, as well as patch density and cohesion indexes, and explore the temporal-spatial features and mechanisms of the evolution of public service spaces. The main results obtained in this paper can be summarized as follows. First, the growth rate of the public service land is lower than that of the built-up area. And the ratio of the public service land to the built-up area is slightly lower than it was before. Second, the evolution of the public service land in each circle area clearly shows spatial differences. Third, the pattern of the public service land changes significantly. The space interaction shifted from the diffusion force to cohesive force. The spatial structure turned from the simplification core area plus multi-sub-centers area to the diversification core area plus multi-sub-centers area. The spatial pattern changed from the large range dispersion plus small scale concentration to the large scale concentration plus small range dispersion. Fourth, different types of public service facilities land show different evolution characters. Fifth, the evolution of the public service spaces is forced by the overall improvement of urban functional spaces, coupling action of the main functional spaces, competition in the urban land market, upgrade of the transportation network, regulation of the urban plan, and promotion of urban great events.

Key words: public service facilities lands, evolution, pattern, mechanism, Changchun