Ecological Land Fr agmentation and Its Connectivity with Urbanization in the Yangtze River Delta

  • 1. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China;
    2. Department of Urban and Regional Planning, Nanjing University, Nanjing 210093, China

Received date: 2007-04-11

  Revised date: 2007-07-17

  Online published: 2007-12-25

Supported by

Key Project for National Natural Science Foundation of China, No.40435013


Rapid fragmentation of natural ecosystems by anthropogenic activity is the important form of natural landscape evolution on earth surface today. In an ecological sense, fragmentation involves dividing up contiguous ecosystems into smaller areas called 'patches'. The development of fragmentation indices mostly parallels the development of landscape ecology. This review examines landscape indices and their usefulness in reflecting the effects of ecosystem fragmentation. Then on the basis of Geographic Information System technology and landscape ecological method, the paper defines the concept of ecological land and measurement indices of fragmentation and urbanization size and spatial configuration, and then quantitatively explores fragmentation properties of ecological land and their relationship with urbanization in the Yangtze River Delta area. Our findings are summarized into three points of view in the end of the paper. (1) Ten fragmentation indices such as MPS, LPI, CAI, NP, PD, FD, SI, MNN, AI and CO based on landscape ecology are firstly handled by selecting the method of Principal Component Analysis of SPSS, and then there are three principal components extracted. The first principal component is defined as size component highly loaded by indices of MPS, LPI, CAI, FD, SI, and the second principal component defined as numeral component highly loaded by NP and PD, and the third component defined as spatial configuration component highly loaded by MNN, AI and CO. According to three principal components the general fragmentation model of ecological land F has been set up. Then the Cluster Analysis is selected to analyze the relationship between F and urbanization level U, urban land ratio UA and Aggregation Index of urban land UI. Lastly there are seven categories areas to be clustered for fragmentation of ecological land in the Yangtze River Delta area, which include two high fragmentation areas (F1, F2), three moderate fragmentation areas (F3, F4, F5) and two low fragmentation areas (F6, F7). (2) Based on the spatial scale of county area and the remote sensing image of a 30-metre resolution, fragmentations of ecological land are the combined representation of urbanization, ecological land properties and the other disturbance resources. The general mode of ecological land fragmentation F has no evident relationship with urbanization level and urban land ratio, whose relative coefficients respectively are 0.303 and 0.432, but has a very clearly negative relationship with urban land Aggregation Index, whose relative coefficient is -0.807. (3) The conclusions of ecological land fragmentation areas and their connectivities with urbanization provide scientific basis for selecting spatial strategies of ecological land safety patterns. At the same time it is very meaningful to guide scientifically urban spatial development direction. The following researches about this topic mainly are from three aspects: exploring influencing factors for ecological land fragmentation by use of high-revolution image data in typical areas; analyzing fragmentation and its connectivity with urbanization based on the buffer zone around urban area; and revealing the dynamical process of ecological land fragmentation caused by urbanization.

Cite this article

SU Weizhong, YANG Guishan, ZHEN Feng . Ecological Land Fr agmentation and Its Connectivity with Urbanization in the Yangtze River Delta[J]. Acta Geographica Sinica, 2007 , 62(12) : 1309 -1317 . DOI: 10.11821/xb200712007


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