基于空间采样的城市景观格局梯度分析——以成都市中心城区为例

通过空间网格采样的格局指数在景观水平上定量并图示化分析了成都市绕城高速以内区域的城市景观格局特征和城乡景观格局差异。结果表明,成都市的圈层式发展特点能够通过空间采样的格局指数进行量化,并且不同的指数从不同的方面表现了成都市景观格局在城乡梯度上的差异。除表现景观形状特征的指数不太规则外,在城乡梯度上平均斑块面积、斑块密度、边缘密度以及聚集度均表现出逐渐上升或下降的单调变化趋势,而最大斑块指数、分割度和Shannon多样性指数均由于城乡交错带的影响表现出非单调变化趋势。

Gradient Analysis of Urban Landscape Pattern Based on Spatial Sampling: A Case Study within the Central Region of Chengdu

Combining spatial lattice sampling with landscape pattern indices,the paper analyzes and illustrates the spatial pattern of the whole expressway rounding area in Chengdu,Sichuan,China.Results of the circling distributed index values indicate that the development of Chengdu city follows the concentric zone theory,and different indices represent different aspects of the landscape pattern along the urban-rural gradient.Except the irregular variation of the patch shape,mean patch size,patch density,edge density and contagion show ascending or descending monotonic trends at the urban-rural gradient,and the largest patch index,division and Shannon's diversity index all have non-monotonic trends for the unique characteristics of landscape pattern at the urban-rural ecotone.