中国地理科学 ›› 2021, Vol. 31 ›› Issue (5): 765-781.doi: 10.1007/s11769-021-1225-5

• Articles •    

Urban Expansion of China from the 1970s to 2020 Based on Remote Sensing Technology

LIU Fang, ZHANG Zengxiang, ZHAO Xiaoli, LIU Bin, WANG Xiao, YI Ling, ZUO Lijun, XU Jinyong, HU Shunguang, SUN Feifei, WANG Yafei   

  1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
  • 收稿日期:2021-03-25 发布日期:2021-09-02
  • 通讯作者: ZHANG Zengxiang, WANG Xiao E-mail:liufang@radi.ac.cn;zx_zhang@263.net;wangxiao98@radi.ac.cn
  • 基金资助:
    Under the auspices of the National Key R & D Program of China (No. 2017YFE0104600)

Urban Expansion of China from the 1970s to 2020 Based on Remote Sensing Technology

LIU Fang, ZHANG Zengxiang, ZHAO Xiaoli, LIU Bin, WANG Xiao, YI Ling, ZUO Lijun, XU Jinyong, HU Shunguang, SUN Feifei, WANG Yafei   

  1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
  • Received:2021-03-25 Published:2021-09-02
  • Contact: ZHANG Zengxiang, WANG Xiao E-mail:liufang@radi.ac.cn;zx_zhang@263.net;wangxiao98@radi.ac.cn
  • Supported by:
    Under the auspices of the National Key R & D Program of China (No. 2017YFE0104600)

摘要: Based on Remote Sensing (RS) and Geographical Information System (GIS) technology, urban expansion of 75 cities in China from the 1970s to 2020 was reconstructed by visual-interpretation method, which described the growing process of urban lands and its influences on local land use structures synchronously. By employing annual expansion area per city and urban expansion density, spatial-temporal characteristics and macro patterns of urban expansion were analyzed from the aspects of regional-distributions, administrative-levels and population-sizes comprehensively. Results indicate that: 1) urban expansion in China was universal, distinct, persistent, periodic and fluctuating. In the past five decades, urban lands of 75 monitored cities in China expanded dramatically from 3606.26 km2 to 30 521.13 km2. 2) Though urban expansion presented significant differences from the aspects of regional distribution, administrative levels, and population sizes, it exhibited a deceleration trend in the 13th Five-Year Plan among all kinds of cities. 3) Cultivated lands were the first land resource for urban expansion, and 55.17% of newly-expanded urban lands appeared by encroaching this land use type. China’s urban expansion has caused sustained pressure on cultivated land protection, especially in super megacities, and the contradiction between urban expansion and cultivated land protection will always exist. 4) The compactness of urban lands in China increased before 1987 and reduced in the next three decades, which was consistent with the implementation of major policies and the deployment of national strategies, and is expected to become compact with a stopping declining or even rebounding after the 13th Five-Year Plan.

关键词: urban expansion, pattern, regional distribution, administrative level, population sizes, Remote Sensing (RS), China

Abstract: Based on Remote Sensing (RS) and Geographical Information System (GIS) technology, urban expansion of 75 cities in China from the 1970s to 2020 was reconstructed by visual-interpretation method, which described the growing process of urban lands and its influences on local land use structures synchronously. By employing annual expansion area per city and urban expansion density, spatial-temporal characteristics and macro patterns of urban expansion were analyzed from the aspects of regional-distributions, administrative-levels and population-sizes comprehensively. Results indicate that: 1) urban expansion in China was universal, distinct, persistent, periodic and fluctuating. In the past five decades, urban lands of 75 monitored cities in China expanded dramatically from 3606.26 km2 to 30 521.13 km2. 2) Though urban expansion presented significant differences from the aspects of regional distribution, administrative levels, and population sizes, it exhibited a deceleration trend in the 13th Five-Year Plan among all kinds of cities. 3) Cultivated lands were the first land resource for urban expansion, and 55.17% of newly-expanded urban lands appeared by encroaching this land use type. China’s urban expansion has caused sustained pressure on cultivated land protection, especially in super megacities, and the contradiction between urban expansion and cultivated land protection will always exist. 4) The compactness of urban lands in China increased before 1987 and reduced in the next three decades, which was consistent with the implementation of major policies and the deployment of national strategies, and is expected to become compact with a stopping declining or even rebounding after the 13th Five-Year Plan.

Key words: urban expansion, pattern, regional distribution, administrative level, population sizes, Remote Sensing (RS), China