基于ETM+影像的深圳城市绿地空间异质性研究

Study on Spatial Heterogeneity of Urban Green Land Based on ETM+ Image in Shenzhen City

[目的]探讨不同绿地类型的空间异质性对其相应的生态效果及功能的影响。[方法]利用ETM+影像将城市绿地划分为公园绿地、附属绿地和其他绿地3种类型,利用地统计学的原理方法对其空间异质性进行了分析。[结果]不同绿地类型的空间异质性存在较大差异,空间异质性尺度具有"附属绿地<其他绿地<公园绿地"的规律。[结论]说明了不同绿地类型对生态功能和过程起作用的尺度是不同的;同时也说明半方差函数图的形状与地物的空间范围、大小及变化等都有关;但在不同方向上的半方差函数差异不显著,近似或趋于各向同性。

[ Objective ] The study aimed to discusses the ecological efficiency and function effects which were relative to spatial heterogeneity of different green land types. [ Method] Urban green land was classified into three types, including park green land, affiliated green land and other green land with the ETM ＋ image. Their spatial heterogeneity was analyzed by using the principle and method of geo - statistics. [ Resuit] The result showed that there are significant differences on spatial heterogeneity among different types. The spatial heterogeneity scale of different green land types has the rule of ＂affiliated green land 〈 other green land 〈 park green land＂, different green lands have different scales in ecological effects and process. At the same time, the results also indicated that shape of semi - variance function was related with the spatial range, size and variety of objects, but differences of semi - variance function in different directions were not significant, and it was approximately isotropy.