上海市景观格局梯度分析的空间幅度效应

Effects of spatial extent in gradient analysis of Shanghai City landscape pattern.

基于2002年上海市土地利用图,利用梯度分析方法,探讨了空间幅度变化对城市景观格局分析的影响。结果表明,景观指数随着空间幅度变化表现出不同的变化规律。当幅度较大(≥5km)时,景观指数沿土地利用样带变化平缓,表现出一定的梯度规律。而当幅度较小(≤3km)时,景观指数沿土地利用样带变化波动较大,规律性不明显。不同景观指数沿样带的表现也有差异,景观比例、斑块密度和景观形状指数的梯度变化规律比较明显,而最大斑块指数、平均斑块分维度、Shannon多样性指数和景观聚集度指数的变化规律不明显。因此,5km的幅度是城市景观格局梯度分析比较合理的尺度。

Scale is the key issue in landscape pattern analysis,and also,in landscape ecology. Based on the land use dataset of 2002,and combining gradient analysis with landscape metrics,this paper analyzed the urban landscape of Shanghai,aimed to investigate the effects of spatial extent in analyzing urban landscape pattern. The results showed that landscape metrics had different variation patterns with the variation of spatial extent,i.e.,varied smoothly and regularly along the land use transect when the extent was...