Bulletin of Surveying and Mapping ›› 2021, Vol. 0 ›› Issue (1): 71-77.doi: 10.13474/j.cnki.11-2246.2021.0013

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Study on spatial-temporal evaluation characteristics of urban land expansion for minority nationality regions in Qinghai-Tibet Plateau: taking Haidong city in Qinghai province as an example

REN Jun1,2,3, ZHANG Fucun4, WANG Wanqi3, GUO Jing5,6, ZHOU Wei2, JIANG Yuxiang4, GUO Xiao3   

  1. 1. Graduate school of Qinghai University, Xining 810016, China;
    2. School of Land Science and Technology, China University of Geosciences, Beijing 100083, China;
    3. School of Civil Engineering, Qinghai University, Xining 810016, China;
    4. Xining Institute of Surveying and Mapping, Xining 810010, China;
    5. Research department of Ecological Environment, Qinghai Academy of Social Sciences, Xining 810000, China;
    6. Northwest Institute of Plateau Biology, Chinese Academy of Science, Key Laboratory of restoration ecology of cold area in Qinghai Province, Xining 810008, China
  • Received:2020-03-12 Published:2021-02-08

Abstract: This paper selects the expansion intensity index, compactness, fractal dimension, center of gravity transfer index and orientation proportion index using GIS spatial overlay analysis technology to analyze quantitatively the spatial-temporal differentiation of urban land expansion of Haidong city based on the remote sensing image data from1990 to 2016. The results show that, the urban land area continuously increases, the compactness continuously declines but the fractal dimension continuously increases, the center of gravity mainly transfers to the west and southeast, and the center of gravity of urban land indicates obvious spatial characteristics and shows an tendency of “orderly-disorderly-orderly”, the urban transfers from spatial imbalance to the coordinated development. Moreover, the orientation proportion index shows obvious spatial orientation differentiation characteristics, and the urban land expansion shows coexisting characteristic of single-wing, double-wing, and fan-shaped pattern. Lastly, during the process of urban land expansion of Haidong city, the terrain of the plateau river valley is a natural constraint, the establishment of the new zone and industrial park is the main route, the policy mutation is the main driving force, and the construction of major infrastructure is the driving force guarantee.

Key words: urban land expansion, urban land, remote sensing, spatial-temporal evaluation, Qinghai-Tibet Plateau

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