基于分维数和稳定性指数的苏州市土地利用类型变化分析

Analysis of Dynamic Changes in Land Use of the Land in Suzhou Based on the Fractal Dimensions and Stability Indexes

在苏州市1985年、2000年土地利用空间数据库基础上,利用分形模型,计算出耕地、林地、草地、水域、居住与工矿用地、未利用土地6种不同地类的分维数、稳定性指数以及平均分维数和平均稳定性指数,并对15年间土地利用类型的分维变化进行了分析。结果表明:苏州市各土地利用类型的分布具有分形结构。从1985年至2000年,林地、草地以及居住与工矿用地趋于规则、稳定;耕地、水域用地趋于复杂、不稳定;未利用土地没有变化;苏州市土地利用结构不够稳定,土地利用形态趋于复杂化。

Based on the spatial database of land use of Suzhou in 1985 and 2000, fractal dimensions (D) and stability indexes (S) as well as average D and S were calculated for cropland, woodland, grassland, water area, industrial and residential land, unused land with the fractal model.Dynamic changes in land use in Suzhou in the past 15 years were analyzed.Results indicated that the distribution of different types of land use in Suzhou City demonstrates fractal properties.From 1985 to 2000, woodland, grassland, industrial and residential land tended to be more inerratic and stable, whereas cropland and water area more complex and unstable. Unused land remained unchanged. During this period, the land use structure of Suzhou was unsteady, and its form became more complex.