长沙市绿色空间与城市扩张耦合关系研究

Coupling Relationship Between Green Space and Urban Expansion in Changsha

基于长沙市2000、2010、2020年土地覆被数据和统计数据,借助ArcGIS、SPSS分析工具,提取长沙市6区1县绿色空间和城市空间数据,从绿色空间迁移、城市重心迁移、城市扩张速率以及景观指数变化趋势等方面对长沙城市扩张的时空特征进行研究。结果表明:(1)2000—2020年,6区1县城市绿色空间和城市空间向东部和东北部迁移,城市空间吸引绿色空间集聚,向心力作用起主导作用。(2)绿色空间和城市空间“此消彼长”,6区1县在近20年间城市空间以14.23%的扩张速率推进城市化进程,扩张总面积达576.78 km^(2)。(3)近20年间6区1县绿色空间的破碎度增加,集聚性降低,人为干扰强度大,而城市空间的集聚性增强,但两类空间的最大斑块面积均呈持续增加的状态,表明城市空间在成片扩张的同时也注重对生态空间的整合。

Based on the land cover data and statistical data of Changsha City in 2000,2010 and 2020,this paper extracts the green space and the urban space in six districts and one county of Changsha with the help of ArcGIS and SPSS,and analyzes the spatial and temporal characteristics of urban expansiond from the aspects of green space migration,urban center migration,urban expansion intensity and landscape index change trend.The results show that:1)In 2000-2020,the urban green space and the urban space in six districts and one county of Changsha City migrated to the east and the northeast,and the overall migration direction of the urban green space was consistent with the direction of urban expansion,in which centripetal force plays a leading role.2)It has conflicts between the growth of the green space and the urban space.In the past 20 years,the urban space expands at a rate of 28.46%in six districts and one county and increases to the total area of 576.78 km2.3)In the past 20 years,the fragmentation degree of green space has increased,the agglomeration has decreased,and the intensity of human interference is high,while the agglomeration of urban space has increased.However,the maximum patch area of the two types of spaces has continued to increase,indicating that urban space pays attention to the integration of ecological space while expanding into pieces.The results can provide reference for the coordination and optimization of urban development and landscape ecology in Changsha.