Analysis of spatial heterogeneity based on fractal dimension on Nanjing road-region vegetation ecosystem

摘要

Spatial heterogeneity, by applying the index of fractal dimension, can quantitatively analyze the ecology function and quality of different landscapes in different scales. In this paper, the road-region vegetation ecosystem of Nanjing urban roads was studied by means of semi-variogram analysis, fractal dimension calculation and field survey. The rationality of vegetation arrangement, spatial heterogeneity and ecosystem stability of vegetation were analyzed comparatively in different road-region and slope directions. The result showed that fractal dimension could accurately and quantitatively value the spatial heterogeneity and ecosystem stability of road-region ecosystem. Under different conditions, the road-region with natural vegetation and less artificial disturbance, in southern slopes, and the wide separating vegetation zones were of high spatial heterogeneity, high ecosystem stability and low fractal dimension.