武汉市城镇扩张适宜性与景观生态安全格局的时空耦合关系研究

Spatial and Temporal Coupling Relationship of Urban Expansion Suitability and Landscape Ecological Security Pattern in Wuhan City

城镇用地扩张与景观生态安全格局之间存在空间上的关联性与冲突性,为探究城镇扩张适宜性与景观生态安全格局的耦合关系,本文以武汉市为例,在2001、2007和2014年3期ETM遥感影像解译的基础上,结合武汉市高程、坡度、全国第二次土地调查与变更调查数据、道路交通网络数据等构建武汉市土地利用时空数据库。从自然环境因素与区位条件因素两大方面构建城镇扩张适宜性评价指标体系,利用GIS空间分析获取武汉市城镇扩张适宜性分布特征,采用最小阻力模型(MCR)构建武汉市景观生态安全格局。从空间分布特征与时间演变特征两个维度研究城镇扩张系统与景观生态系统之间的耦合关系。

Spatial correlation and conflict widely exists between the expansion of urban land and landscape ecological security pattern.To reveal the coupling relationship between urban expansion suitability and landscape ecological security pattern,this paper has constructed the spatial and temporal database of land utilization adopting remote-sensing imagery interpretation of Landsat7 ETM satellite data of 2001,2007 and 2014 besides the data of elevation,slope,the second national land survey and land change survey,and the transportation network. The urban expansion suitability expansion index system is established in the aspects of naturalenvironmentand location,and the distribution features of urban expansion suitability are obtained through spatial analyst of geographic information system. Landscape ecological security pattern is calculated by Minimum Cumulative Resistance Model（ MCR）. The different levels of districts of urban expansion suitability and landscape ecological security are respectively designated by K-means classification method and thresholds of salutation. The coupling relationship between urban expansion system and landscape ecological system is analyzed in both aspects of spatial distribution and temporal change features.