成都市中心城区绿色空间格局演变与道路网络耦合分析

路网密度的提升会导致斑块破碎、栖息地减少等现象.以成都市中心城区为研究对象,基于遥感影像获取1995、2005、2015年的绿色空间数据,运用形态学空间分析等方法明确了绿色空间格局演变特征及划分出绿地斑块等级,同时针对包含高速公路在内的5种道路类型分别按照100、500、1000、2000m的宽度建立缓冲区,分析出不同...

Coupling Analysis of the Spatial Pattern Evolution of Green Space and Road Network in the Central City of Chengdu

The increasing density of urban road network will cause impacts such as patch fragmentation and habitat reduction. Taking Chengdu''s central city as the research area, based on remote sensing images, the data of green space in 1995, 2005 and 2015 were obtained, and the spatial-temporal evolution of green space network structure elements, as well as the grade and evolution of patches were clarified by morphological spatial pattern analysis and other methods. Then, buffer zones of 100m, 500m, 1000m and 2000m were established for 5 road types including expressway. Finally, patch changes of different road types in different buffers were analyzed, and the graph relationship between green space fragmentation and road network coupling was summarized. The results showed that: 1) Land use changes are mainly due to the massive conversion of green space area into construction land. The fragmentation of patch in 1995-2005 was perforated, and in 2005-2015 the patches were further broken to the northeast and southwest. 2) The number of low-grade patches in different buffer zones has increased, the overall area is small, and the number of high-grade patches has increased, and the area has declined significantly. The green patch area has a decreasing trend, and the highway has the largest impact area. Each road type shows the rule that the larger the width, the weaker the impact on the patch. 3) From 1995 to 2015, different road types had different strengths of fragmentation, but overall the landscape structure was further diversified, the phenomenon of patch fragmentation had become more obvious, and the shape of the patch had a single development trend. For green spots on both sides of different road types, the complexity of the block shapes tends to be the same. 4) In 1995-2005, the patches atlas types were mainly fragmented, also including hollow, cutting, scattered types. In 2005-2015, the patch types evolved further, especially the increase of fragmented type. The results can provide references for road network planning and ecological space protection