黄土高原典型地貌类型的土地利用分形特征

以山西省闻喜县1∶1万土地利用现状数据库为数据源,运用GIS技术,基于DEM数据及地貌特征将闻喜县分为河谷、塬地、丘陵、山地4种地貌,计算各地貌下不同土地类型的分维数和稳定数,并对计算结果进行分析比较。结果表明:不同的地貌特征不仅对土地利用结构有影响,对其分维指数和稳定性指数也有影响;相同地貌特征下不同的土地类型分维数和稳定性指数存在着差异,分维数越高土地利用类型的结构越复杂,稳定性指数越高土地利用类型的结构越简单。通过对分维数和稳定性指数的研究可为优化土地利用结构和可持续利用土地资源提供依据。

Fractal Characteristics of Land-Use for Typical Geomorphic Types in Loess Plateau

In this paper,with 1 ∶ 10 000 land-use database of Wenxi County as the data source,supported by GIS and based on DEM data and geomorphologic features,the geomorphology of Wenxi County was divided into four kinds such as the river valley,yuan region,hill and mountains.The fractal dimensions and stability index of different landforms and different land type were calculated.The result showed that the distribution of land-use type in Wenxi County had the fractal properties,different landforms affected not only the land utilization structure but also the fractal dimension and stability index,the distinction existed between the different fractal dimension and stability index in the same landforms.The higher the fractal dimension was,the more complex the land-use structure would be,the higher the stability index was,the more simple the structure of land-use structure would be.According to the research of fractal dimension and stability index,a basis for the further optimization of land-use structure would be provided.The studies of land use complexity and stability of different landforms could provide valuable reference for more rational land use,spatial arrangement and structural optimization of land resources in Loess Plateau Region.