城市绿地作为城市生态系统的重要组成部分,对城市发展的贡献不可估量。以扬州市为例, 在ArcGIS 9.2支持下，借助于2005年SPOT 5遥感影像数据，引入景观巧合概率指数(LCP)、整体连通性指数(IIC)、可能连通性指数(PC)和重要值等评价指数，对研究区内的绿地斑块等级、连通性和空间结构进行分析。结果表明：当连通距离设置为500 m时， LCP、IIC和PC所反映的斑块重要性排列顺序基本一致；以500 m阈值确定2 km2绿地核心区内，绿地斑块数和面积分别占总体的8 %和16 %；核心区内的绿地斑块主要以中大型和大型斑块为主，斑块连接度高，破碎化程度较低。因此，控制核心区用地规模，加强核心区内的植物保护与建设，通过构建以核心区为重要节点的绿地网络是增加扬州城市绿地系统生态效益的关键。
Abstract
Greenland is an important part of complex urban ecosystems and provides significant ecosystem services. According to the spot 5 remote sensing data in 2005,the rank, connectivity and space structural measurement of urban green patches in Yangzhou were analyzed under the support of ArcGIS 9.2.In the analysis, some key indexes, e.g., landscape coincidence probability (LCP), integral index of connectivity (IIC), probability of connectivity (PC) and the important value etc., were introduced. The results showed that when the connectivity distance was 500 m, the order of important value reflected by dLCP, dIIC and dPC was almost the same. In the 2 km2 established core region by setting 500 m threshold value, the number and size of green patches accounted for 8 % and 16 % of the total respectively; the core region was mainly composed of medium large patch and large patch. The green patches in this area had high connectivity and low degree of fragmentation. In the future planning and construction, several aspects i.e., controlling land size of green core region, strengthening construction and plant protection in core region and constructing important node of core region in greenland ecological network should be concerned, they are important to enhance the ecological benefits of urban greenland system.
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基金
收稿日期：2010-05-31修回日期：2010-10-12基金项目：国家自然科学基金项目(30972415)；“十一五”国家科技支撑计划(2008BAJ10B02)作者简介：侍昊（1986—），博士生。*徐雁南（通信作者），教授。 Email: nfuxyn@yahoo.com.cn。
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