Acta Geographica Sinica

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Appraisal of Land Resources Security in Guangzhou Based on Major Function Regionalization

ZHENG Rongbao1,  LIU Yihua2,  DONG Yuxiang3,  ZHU Gaoru3   

  1. 1. College of Economics and Management, Guangdong University of Technology, Guangzhou 510520, China;
    2. School of Geography Sciences, Guangzhou University, Guangzhou 510405, China;
    3. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2008-12-11 Revised:2009-02-22 Online:2009-06-25 Published:2010-04-15
  • Supported by:

    National Natural Science Foundation of China, No.40771003; Key Project of Science and Technology of the Ministry of Education of China, No.108171

Abstract:

Based on the theory of scientific concept of development, the space of Guangzhou is divided into the optimized development zone, the emphasized development zone, the limited development zone, the forbidden development zone, and the land reserved zone. After that, this paper constructs the security evaluation indexes from four aspects consisting of land quantity security, quality security, economic security and ecological security. The values of land security in Guangzhou were calculated through model of support vector machines by a grid of 30 m ×30 m as the smallest appraisal units. The main conclusions are drawn as follows: (1) The forbidden development zone is 2766.00 km2, accounting for 37.21% of the city's total area. The land permitted to develop is 1851.07 km2, or 24.90% of the city's total; the emphasized development zone 1457.09 km2, or 19.60%; the optimized development zone is 992.46 km2, or 13.35%; and reserved zone area is 370.61 km2, or 4.99%. (2) Five types of safety grades are identified, with the value ranging from 16 to 86, but different districts are in different safe ranks. The best safe condition is Nansha district and the worst is Liwan district. (3) The result shows that the situation of land security in Guangzhou can not be optimistic. The percentages of dangerous and unsafe areas add up to 32.35%, which are mainly concentrated in remote mountainous suburbs and center of the city. GDP of the per unit construction area, the per capita living space and NDVI are the main factors affecting land resources security in Guangzhou.

Key words: major function regionalization, land security, support vector machine, Guangzhou