关键词: 城市景观, 城市化, 景观格局, 景观指数, 空间采样, 梯度分析

Abstract: 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.

Key words: urban landscape, urbanization, landscape pattern, landscape indices, spatial sampling, gradient analysis