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以长沙市建成区为研究区域,选取2000年、2005年和2010年的遥感影像作为数据源,在ArcGIS和Fragstats4.0软件平台的支持下,运用缓冲区分析和景观指数方法,对长沙市的城市空间扩张及其对边缘区景观格局的影响进行研究,结果表明:2000-2010年期间,长沙市城市空间扩展在速度上呈前期低速蔓延、后期加速扩张的特点,在方向上呈前期东拓西控、后期北扩南伸的特点;城市空间扩展对类型层次和景观层次的景观格局指数变化的影响均不同。在类型层次上,城市空间扩张对耕地的影响最大,与城市边界距离3 000~4 000m处是城市扩张与耕地减少的空间边界;在景观层次上,随着城市空间扩张,景观的斑块密度减小、蔓延度增加、香农多样性先减后增、聚集度增加。
Taking the built-up area of Changsha City as the research area, the remote sensing images of 2000, 2005 and 2010 were selected as data sources. With the support of ArcGIS and Fragstats4.0 software platform, the buffer area analysis and landscape index Urban space expansion and its impact on the marginal zone landscape pattern. The results show that during the period of 2000-2010, the urban space expansion in Changsha City showed the characteristics of slow spread in the early period and accelerated expansion in the late period, Westward control and post-North expansion southward. The impact of urban space expansion on the change of landscape pattern index at the type and landscape levels is different. At the type level, the expansion of urban space has the greatest impact on cultivated land. The distance from the urban boundary is between 3,000 and 4,000 meters, which is the spatial boundary of urban expansion and reduction of cultivated land. At the landscape level, as the urban space expands, the patch density Reduce and increase the degree of spread. Shannon’s diversity first decreases and then increases, and the degree of aggregation increases.