PROGRESS IN GEOGRAPHY ›› 2021, Vol. 40 ›› Issue (2): 220-231.doi: 10.18306/dlkxjz.2021.02.004

• Articles • Previous Articles     Next Articles

Mechanism of interaction between urban land expansion and ecological environment effects in the Yangtze River Delta

YANG Qingke1, DUAN Xuejun2,3,*(), WANG Lei2,3, WANG Yazhu2,3   

  1. 1. School of Public Administration, Nanjing University of Finance & Economics, Nanjing 210023, China;
    2. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
    3. Key Laboratory of Watershed Geographic Sciences, CAS, Nanjing 210008, China
  • Received:2020-02-08 Revised:2020-03-27 Online:2021-02-28 Published:2021-04-28
  • Contact: DUAN Xuejun
  • Supported by:
    National Key R&D Program of China, No(2018YFD1100101);National Natural Science Foundation of China, No(41601169);Project of Philosophy and Social Science Research in Colleges and Universities in Jiangsu Province, No(2020SJA0276)


Taking the Yangtze River Delta as the research object, this study established the correlation model and coupling degree model for evaluating the mechanism of interaction between urban land expansion and ecological environment effects by using grey correlation analysis method. It explored the pattern of temporal and spatial variation and coupling degree characteristics of urban land expansion and ecological environment effects and change, and analyzed the interactions between the two systems. The results show that: 1) The index of urban land expansion in the Yangtze River Delta has been increasing, and the socioeconomic development and land use development have played a significant positive role. Socioeconomic development imposes a demand for greater urban production and living space and higher environmental quality. The increase of construction land area, the high-intensity expansion and the decrease of population density are all important reasons for the increase of urban land expansion index. 2) The overall performance of the regional ecological environment quality is stable, and the ecological environment effect is reflected in its spatial differentiation, with obvious characteristics of spatial and temporal change. The ecological environment quality of the cities in Zhejiang Province is significantly higher than that of Shanghai Municipality and Jiangsu Province, which is closely related to the regional environmental carrying capacity, the construction of pollution control facilities, and the propagation of ecological protection concepts. 3) Most cities have low coupling degree between urban land expansion and ecological environment effect, and the relationship between the two systems is in a state of imbalance. In the process of urbanization, land expansion tends to be low-density and decentralized, which strongly threatens the ecological security and environmental quality and lead to the increase of spatial disparity between urban land development and ecological environment protection. 4) There is a strong interaction between the elements of urban land expansion system and ecological environment system in the Yangtze River Delta, and the forces of each element are slightly different. The stressing effect of urban land expansion on ecological environment is gradually increasing, while the restraining effect of ecological environment on urban land expansion is decreasing.

Key words: urban land expansion, ecological environment effect, mechanism of interaction, Yangtze River Delta