北京地区植被景观斑块形状的分形分析

 借助GIS软件ARC／INFO、利用分形理论对北京地区的植被景观进行了分析，并对各种类型不同尺度上的斑块复杂性以及可能的尺度域进行了评价。结果表明：计算分维的两种方法得到的结果具有很强的正线性相关性，分维与平均斑块面积也呈显著的正相关；并且大多数相近类型(即同一大类内的各类型)斑块的分维也相近。本研究还识别出两个尺度域，一个是斑块面积小于2.7km2(大约)，另一个是斑块面积大于2.7km2(大约)。后一个域中的斑块明显比前一个域中的斑块复杂。出现这种现象的原因主要是由于大斑块经常出现不同类型的斑块相互嵌套，而小斑块则很少出现甚至不出现这种现象。

LANDSCAPE SCALE FRACTAL ANALYSIS OF PATCH SHAPE IN THE VEGETATION OF THE BEIJING REGION

The pattern of the vegetated landscape in Beijing was analyzed using fractals and the GIS software ARC/ INFO. Patch complexity was examined for a range of defined vegetation types. Significant positive linear correlations were found between fractal dimensions calculated using two different methods, and between each of the two fractal dimensions and average patch size. Fractal dimensions for the types within a type in the higher level are more similar than those not within a type in the higher level. Two domains of scale were identified: those larger and smaller than about 2. 7km2. Patches in the large domain are more complex than those in the smaller domain. The main reason for which is that large patches are of ten inlaid with smaller ones while this phenomenon rarely occurs among smaller patches.