基于ETM＋影像的深圳城市绿地空间异质性研究

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。

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

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.Result] 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.