关键词: 城镇体系结构；城市化；耦合机制；西陇海兰新经济带；甘肃

Abstract:

The structure of urban system is the basic framework of the pattern and evolution of urbanization. This article takes western Longhai-Lanxin economic zone in Gansu as an example，uses statistical data of 41 counties and the above cities in Gansu section, combining the correlation analysis model, the fractal theory and the GIS spatial analysis method, from the urban system rank scale structure, the spatial structure and the urbanized quota relations，discusses the cities architecture essential feature as well as with urbanized space and time coupling mechanism, and obtains the following conclusion: (1) Gansu section cities architecture takes 2002 as a turning point and enters the second stage; inclined development, with the following characteristics: the rank scale does not obey the order of the bits - scale principle, belonging to the typical first place distribution; the scale structure has fractal features and the single core growth pattern has differentiation; and the spatial structure has fractal features, presenting the axis spatial distribution pattern. (2) The urbanized level does not only depend on the urban scale size (shows the logarithm relations with the urban scale) but also depends on the equalization of urban scale structure (its logarithm becomes linear relationship in the scale structure equalization with imbalanced index), simultaneously, the spatial structure of urban system also affects its development.

Key words: Gansu, structure of urban system；urbanization；coupling mechanism；western Longhai-Lanxin economic zone