土地利用类型结构的多尺度转换特征

On multi-scale characteristics of structure of land use

尺度一直是LUCC到GLP研究所关注的重要问题。以不同比例尺的辽宁省土地利用数据为例,以贵州省土地利用数据进行验证,系统探讨了土地利用类型结构在不同尺度间可能存在的转换特征。结论如下:(1)辽宁省土地利用的分形结构跨1∶10万、1∶50万、1∶100万这3个比例尺客观存在;(2)对不同比例尺的同一区域不同土地利用类型而言,各土地利用类型分维在不同比例尺之间存在的响应关系并不一致,某些土地利用类型的分维随着比例尺由1∶10万向1∶50万再向1∶100万的变小,分维呈现变大趋势,而某些土地利用类型的分维随比例尺的变化并不如此,所以,对于不同的土地利用类型而言存在一定的差别,不可一概而论;(3)不同尺度间的土地利用类型结构只能够在两两连续间隔的两种比例尺土地分维之间建立起关系显著的定量关系模型。所得结论对科学认知土地结构空间配置的多尺度特征以及建立相应尺度转换模型具有积极的参考意义。

Applications of fractal theory to LUCC have involved calculation of fractal dimensions of different land types,correct research methods,fractal description of land structure and its evolution,fractal modeling of regional landscape patterns,etc.Although many related studies have been done,investigations to determine the spatial fractal characters of land use and its scale character istics should be further attempted.In this paper,the fractal theory is applied to analyze the spatial multi-scale characteristics of structure of landuse as a case study of Liaoning Province at scales of 1∶100000,1∶500000 and 1∶1000000.The perimeter-area relationships of patches of different landuse types of Liaoning Province at different scales are established.The fractal characteristics of landuse structure in Liaoning Province are analysed,and the relationships between fractal dimensions of landuse spatial structure are established.It is indicated that spatial structure of Liaoning Province＇s landuse exists at scales of 1∶100000,1∶500000 and 1∶1000000,the change of fractal dimension at scales of 1∶100000,1∶500000 and 1∶1000000 is different,and the spatial corresponding models of fractal dimensions for different landuse types in different scales only can be established by the fractal dimension data between scales of 1∶100000 and 1∶500000,1∶500000 and 1∶1000000.The conclusions drawn based on data of Liaoning Province are validated by using the landuse data of Guizhou Province.