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Characteristics and Spatial Difference of Urban Scale Expansion in
Different Scales in the Yangtze River Economic Belt
GUAN Dongjie，HE Xiujuan，CHEN Lin
2020, 39(06):
108-116.
DOI: 10.3969/j.issn.1674-0696.2020.06.17
Based on the remote sensing data of nighttime lights in the Yangtze River Economic Belt (YREB) from 1992 to 2012, the law of urban rank scale evolution and the difference of urban spatial expansion in the YREB were analyzed by the Pareto coefficients and the urban expansion index. The results show that: during the year from 1992 to 2012, the Pareto coefficients in the YREB have increased from 0.55 to 0.77, with an average annual change of 0.011. On the urban agglomeration scale, the Pareto coefficients have increased by 0.340, 0.320, and 0.270 in the Cheng-Yu urban agglomeration (CY), Yangtze River Delta urban agglomeration (YRD) and Central Yangtze River urban agglomeration (CYR). Based on the distinction of mega, large, medium and small cities, the rank change of mega, large and medium cities in the urban agglomerations from 1992 to 2012 was further analyzed. In the three urban agglomerations, the Pareto coefficients of mega cities were relatively stable, and the fluctuation range of Pareto coefficients of big and medium cities decreased gradually with the time axis. From 1992 to 2012, the cities in the YREB with intense urban expansion were mainly distributed in the middle and lower reaches of the Yangtze River, such as Shanghai, Hangzhou, Wuhan, while the urban expansion in the upper reaches of the Yangtze River was mostly slow and stable. On the whole, the order of megacities in the YREB was the most stable, but the number of megacities was small, which showed that the promotion speed of megacities was slow, especially in the western and central regions. By 2012, the eastern part of the YREB has entered the stage of urban continuum, while the inland urban agglomeration has still been in the stage of development dominated by the central city. Wuhan, Chongqing and Chengdu, as megacities, dominate the development of inland urban agglomerations, but the radiation capacity of the central cities is limited, which makes the urban system structure of the YREB unreasonable.
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