Spatial variance characters of urban synthesis pattern indices at different scales

Abstract

Abstract: Scale holds the key to understand pattern-process interactions,and indeed,becomes one of the corner-stone concepts in landscape ecology.Geographic Information System and remote sensing techniques provide an effective tool to characterize the spatial pattern and spatial heterogeneity at different scales.As an example,these techniques are applied to analyze the urban landscape diversity index,contagion index and fractal dimension on the SPOT remote sensing images at four scales.This paper modeled the semivariogram of these three landscape indices at different scales,and the results indicated that the spatial variance characters of diversity index,contagion index and fractal dimension were similar at different scales,which was spatial dependence.The spatial dependence was showed at each scale,the smaller the scale,the stronger the spatial dependence.With the scale reduced,more details of spatial variance were discovered.The contribution of spatial autocorrelation of these three indices to total spatial variance increased gradually,but when the scale was quite small,spatial variance analysis would destroy the interior structure of landscape system.The semivariogram models of different landscape indices were very different at the same scale,illuminating that these models were incomparable at different scales.According to above analyses and based on the study of urban land use structure,1 km extent was the more perfect scale for studying the spatial variance of urban landscape pattern in Shanghai.The spatial variance of landscape indices had the character of scale-dependence,and was a function of scale.The results differed at different scales we chose,and thus,the influence of scales on pattern could not be neglected in the research of landscape ecology.The changes of these three landscape indices displayed the regularity of urban spatial structure at different scales,i.e.,they were complicated and no regularity at small scale,polycentric at moderate scale,and circle-zoning at big scale.

Key words: Scale, Spatial pattern, Semivariogram

CLC Number:

Q143

YUE Wenze, XU Jianhua, XU Lihua, TAN Wenqi, MEI Anxin . Spatial variance characters of urban synthesis pattern indices at different scales[J]. Chinese Journal of Applied Ecology, 2005, 16(11): 2053-2059.

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