JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (4): 732-744.doi: 10.31497/zrzyxb.20190405

• Resource Ecology • Previous Articles     Next Articles

The relationship analysis of urban expansion types and changes in ecological landscape types based on LEI and MSPA in the city of Nanchang

ZHAO Yan-ru(), ZOU Zi-li(), ZHANG Xiao-ping, WEI Xiao-jian   

  1. School of Geomatics, East China University of Technology, Nanchang 330013, China
  • Received:2018-09-26 Revised:2019-01-23 Online:2019-04-20 Published:2019-04-20

Abstract:

The economic growth and urbanization development of Nanchang have been accelerated significantly and considerably by China's rapid urbanization and industrialization since the reform and opening-up in the late 1980s. However, due to the rapid urban expansion, the ecological and environmental problems caused by the fragmentation of green landscapes have become more serious. Thus, this paper chose Nanchang city as an example to analyze the changes and relationship of urban expansion types and ecological landscape types, which will provide guidance for improving the ecological environments. Firstly, this paper used the Landscape Expansion Index (LEI) to identify the expansion models of the three periods, and analyzed the variations of construction land expansion from both time and space, based on the land use data of 2000, 2005, 2010 and 2015. Then, the Morphological Spatial Pattern Analysis (MSPA) method was used to obtain the ecological landscapes of the four periods, and expressed the ecological landscape fragmentation process from nine representative points. Finally, multiple buffer layers were created to explore the correlation between the variations in different expansion types and landscape types. The results are shown as follows. (1) Edge-expansion is the main expansion pattern, while ecological landscape is dominated by "core", and the variation of expansion types and landscape types varies with time. (2) The relationship between urban expansion types and ecological landscape types in different circles is significantly different at different development periods. (3) During the urban expansion process, infilling expansion is the main method to improve the compactness at the central urban area. In general, the ecological landscape is more fragmented, the edge-expansion will accelerate the reduction of large green patches, and the outlying expansion promotes the green landscape units more fragmentary, while infilling expansion has the effect of weakening the process. According to the research results, calculating the landscape expansion index of the newly approved construction land and studying the current situation of ecological landscape types will enable decision makers to identify the urban expansion trend and make scientific and developmental predictions for the next stage of development. Then, decision makers can control the disorderly urban sprawl from a macroscopic level.

Key words: LEI, MSPA, urban expansion, landscape pattern, relationship analysis, Nanchang