南京东郊生物多样性保护核心绿地分析方法研究

Analysis Method of Greenspace in the Core Area for Biodiversity Conservation in Eastern Suburb of Nanjing City

以南京东郊绿地系统为对象,在ArcGIS 9.2、连通性分析软件conefor sensinode 2.2的支持下,以2005年南京东郊SPOT 5卫星影像、2005年南京快速交通矢量化文件为主要信息源,采用巧合概率指数(LCP)、整体连通性指数(IIC)、可能连通性指数(PC)和重要值(dI)等评价指标,分析研究区内的绿地斑块等级、连通性和空间结构。在此基础上,利用连通性指数确定生物多样性保护核心绿地区域。结果表明:以青龙山为主的24个绿地斑块,面积占研究区绿地斑块总面积的35%,构成了研究区域生物多样性保护的核心绿地;核心绿地斑块平均大小、最大斑块占景观面积比例2项指标分别比研究区高出0.31、59.46,景观边缘密度、景观形状指数2项指标分别比研究区低13.55、6.59;宁杭公路和沪宁高速2条快速通道对核心绿地的屏障作用最大。提出快速交通影响下南京东郊生物多样性保护核心绿地的管理对策。

The green space system in the eastern suburb area of Nanjing City was chosen as the research object,while the remote sensing data of SPOT 5 satellite image taken in 2005 and a vector file of Nanjing rapid traffic network in 2005 were taken as the major information sources to analyze the patch grade,the connectivity and spatial structure of the studied green space under the support of ArcGIS 9.2 and connectivity computation software of Conefor Sensinode 2.2 by taking landscape coincidence probability(LCP),integral index of connectivity(IIC),probability of connectivity(PC),and the important value(dI) as evaluation indexes.The core green space area for biodiversity conservation was determined based on calculation of the connectivity indexes.The research results showed that 24 green space patches around the Qinglong Mount,whose area accounted for 35% of the total studied green space area,consisted in the core area for biodiversity conservation in the eastern suburb area of Nanjing City.The mean patch size(MPS) and the largest patch index(LSI) in the core area was 31% bigger and 59.46% higher respectively than those of in the whole study area.Whereas the landscape edge density(ED) and the landscape shape index(LSI) of the core area for biodiversity conservation was 13.55 and 6.59 lower respectively than those of in the whole study area.The most important barrier effect to the core green space area was brought with the Ning-Hang Highway and the Hu-Ning Express.The countermeasures to manage the core green space area for biodiversity conservation in the eastern suburb area of Nanjing City under the impact of rapid traffic network were put forward in the paper.