大城市城乡耦合地域空间演变及其景观格局——以无锡市为例

基于城乡耦合关系,选择无锡市城市化地域过程和空间范围动态变化显著的城乡耦合地域作为研究实体,综合RS、GIS及景观生态学分析方法,确定1984～2008年5个时段城乡耦合地域范围,并揭示其动态演变过程.在此基础上,研究不同时期城乡耦合地域范围内景观生态格局及其响应变化.结果表明,快速城市化地区城市连续建成区的扩张导致耦合地域同幅扩展;耦合地域内建设用地比例随着耦合地域向外推移和扩展而持续增加,并且其内部的主要建设用地斑块结构稳定性呈现先降后升的特征;耦合地域空间演变引起各类型景观格局密度指数相应变化,建设用地景观增加导致生态景观整体趋于破碎化;而耕地景观相邻边界的主导地位在快速丧失的同时建设用地相邻边界主导地位不断增强,以边界镶嵌度EPD表征的景观交错分布程度不断提高.

Analysis of landscape pattern and spatial evolution in the metropolitan urban- rural coupling regions: a case study of Wuxi City

The urban-rural coupling region of Wuxi has been selected as the focus of this study because of the co-existence of both urban and rural landscapes. This region has experienced remarkable urbanization and transformation. In this paper we ascertained the urban-rural coupling regions of five periods about Wuxi over 1984-2008 by synthesizing remote sensing, geographic information system, and landscape ecology, with the landscape ecology pattern analyzed in each period. Results indicate that the expansion of continuous built-up area in this rapidly urbanized area accompanied by a synchronous expansion of the coupling regions. The percentage of construction land in coupling region keeps increasing along with the expansion of coupling region. The master construction patch is characterized by an initial decrease and subsequent increase in its stability. The spatial evolution of coupling region has induced a corresponding change of landscape pattern density index. The increases of construction patch lead to landscape fragmentation as a whole. With the rapid decline in the dominance position of plowland adjacent boundary, construction adjacent boundary is increasingly gaining its dominance. This has resulted in the ever rise in the inter-mingling of different landscapes, as revealed by the degree of landscape mosaic denoted by the edge patchiness degree.