作　　者： ; ; ; ; ;

机构地区： 中华人民共和国环境保护部

出　　处： 《国土资源遥感》 2011年第1期133-137,共5页

摘　　要： 基于2000年长沙市1∶10万土地利用图,利用ERDAS软件对1989年、2006年的遥感图像进行解译;在地理信息系统软件ArcGIS和景观格局分析软件Fragstats支持下,以城镇建设空间重心为中心,分别选取东西、南北景观样带(40 km×8 km)和8个不同半径的同心圆缓冲区,用斑块密度、边界密度、平均斑块分维数、蔓延度指数及香农多样性指数等指标,定量分析长沙市景观破碎化时空分异特征。研究结果表明:①相对于1989年,2006年长沙市城市建设用地空间重心向东偏南约75°角方向移动了2.45 km;②随着城市化的不断推进,城镇建设不断以圈层式空间形态向外扩张,对近郊地区的景观生态格局造成较大的影响;③"城市-乡村"样带研究表明,城市集聚效应明显,市中心景观破碎化程度较小,连通性较好,近郊地区土地利用类型多样,景观异质性变化显著,各斑块被边界割裂的程度高,连通性差,破碎化程度高。 Based on Remote Sensing and GIS, this paper quantified the landscape fragmentation of Changsha city by using landscape pattern metrics such as patch density, edge density, mean patch fractal dimension, landscape contagion index and Shannon diversity index. To reflect the spatial change in landscape fragmentation from the extent of human influence on the environment, the authors selected two transects in the orientation from north to south （N -S,40 km ×8 km） and from west to east （W - E, 40 km ×8 km） through Changsha＇ s spatial gravity center. Eight concentric areas with different radii from Changsha＇ s spatial gravity center were also selected to analyze the temporal change in landscape fragmentation. The results show that the spatial gravity center has moved 2.45 km in east - southeast direction for about 75 %. The outward expansion of the construction land in the form of concentric zone model has a great impact on the landscape pattern of the suburbs. The study of urban - to - rural transects has also showed that the agglomeration effects in urban areas are obvious. In contrast to the city center, fragmentation of landscape has been increasing and spatial heterogeneity has been changing dramatically in suburban areas.

关 键 词： 景观破碎化 移动窗口 梯度分析 空间重心 长沙市

领　　域： [环境科学与工程]