Landscape Ecology

, Volume 21, Issue 5, pp 723–734

Impacts of road corridors on urban landscape pattern: a gradient analysis with changing grain size in Shanghai, China

  • Ming Zhu
  • Jiangang Xu
  • Nan Jiang
  • Jianlong Li
  • Yamin Fan
Research Article

DOI: 10.1007/s10980-005-5323-z

Cite this article as:
Zhu, M., Xu, J., Jiang, N. et al. Landscape Ecol (2006) 21: 723. doi:10.1007/s10980-005-5323-z

Abstract

Urbanization is one of the most important driving forces for land use and land cover change. Quantifying urban landscape pattern and its change is fundamental for monitoring and assessing ecological and socioeconomic consequences of urbanization. As the largest city in the country, Shanghai is now the fastest growing city in China. Using land use data set of 2002 and combining gradient analysis with landscape metrics, we analyzed landscape pattern of Shanghai with increasing grain size to study the impacts of road corridors on urban landscape pattern. Landscape metrics were computed along a 51×9 km2 transect cutting across Shanghai with a moving window. The results showed that the urban landscape pattern of Shanghai was greatly changed when road corridors were merged with urban patches and the variation of patch density would alter when grain size changed. As a linear land use type, road corridors exhibited a different spatial signature comparing with other land use types and distinctive behavior with increasing grain size. Merging road and urban patches resulted in a sharp reduction in patch density, mainly caused by segmentation of roads corridors. The results suggested that grain size around 7.5 m might be optimal for urban landscape analysis. Landscape patch density is significantly correlated with road percent coverage and the most important effect of road corridors in urban landscape is increased habitat fragmentation.

Keywords

Fragmentation Gradient analysis Grain size Land use Landscape pattern Patch density Road corridors Urbanization 

Copyright information

© Springer 2006

Authors and Affiliations

  • Ming Zhu
    • 1
  • Jiangang Xu
    • 2
  • Nan Jiang
    • 3
  • Jianlong Li
    • 1
  • Yamin Fan
    • 1
  1. 1.Department of BiologyNanjing UniversityNanjingP.R. China
  2. 2.Department of Urban and Resources ScienceNanjing UniversityNanjingP.R. China
  3. 3.Nanjing Institute of Geography and Limnology, Chinese Academy of SciencesNanjingP.R. China

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