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A Study of Spatial Structure of Urban System in Ecology-Vulnerable Regions in Northeastern Periphery of Tibetan Plateau——A Case Study in Gannan Tibetan Autonomous Prefecture

LI Wei1 MAO Wen-liang2 (1.College of Geography and Environmental Science,Northwest Normal University,Lanzhou Gansu 730070,China; 2.College of Resource and Environmental Sciences,Gansu Agricultural University,Lanzhou Gansu 730070,China)  
The ecological environment in the Tibetan Plateau is typical vulnerable,which has been set as a restricted and prohibited developing region in the main function division in China.At the same time,it is a region concentrated with poor people,facing the pressures of both protecting ecological environment and developing economy.Therefore,it is of great significance to promote regional integration and sustainable development,and to optimize regional spatial structure,in order to guide city and town's development acclimatized to ecological environment and to narrow the regional gaps,following the ideology of the main functional areas.Taking the Gannan Tibetan Autonomous Prefecture as an example,using GIS technology,the spatial distribution characteristics of highland towns and how to optimize spatial functional organization under multiple constraint conditions are discussed in this paper.For facilitating the urbanization of agricultural and pastoral population and stressing infrastructure construction,it is believed that the development of the towns in the prefecture should follow the urbanization of distinction and intensification under the premise of maintenance of ecosystem services.In the urban space,based on " shaped layout,it is necessary to strengthen the northern " shaped frame and to perfect the southern " shaped frame,and then form a rational layout of urban spatial structure,in order to provide a solid platform for improving the living standards and the ecological environment in the ethnic areas.Thus,economic and social sustainable development,together with a harmonious society,will be achieved in the prefecture.
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