珠江三角洲城市群区域绿道与生态游憩空间的连接度与分布模式

绿道对城市群构建连续的生态开放空间网络具有重要作用。基于珠三角城市群现有区域绿道网络,采用拓扑网络和社会网络分析评估生态游憩空间的连接度,揭示生态游憩空间联系的空间分布模式,结果表明：“生态游憩空间-区域绿道”拓扑网络的α、β、γ指数分别为0、0.386、0.129,说明网络中点和边较少,网络为树状形,环通性不高,总体连接度较低;绿道对生态游憩空间的连接度呈集群式分布,且处在边缘的凝聚子群连接度高于中心地区的子群;各集群之间的连接度呈现出东部-北部区域大于西部、东西部之间空间分割性比较明显的格局;连接度分布模式的形成主要受绿道政策与布局、绿道建设机制、生态游憩空间规模集聚格局、地理阻隔与空间邻近性的影响。最后,论文提出了优化“生态游憩空间-绿道”分布模式、构建连接度更高的生态开放空间系统的路径,给中国城市群规划和发展提供参考。

Connectivity and distribution pattern of regional greenways and ecological recreation spaces in the Pearl River Delta urban agglomeration

Greenways play an important role in building a continuous ecological open space system in an urban agglomeration. Based on the regional greenways in the Pearl River Delta urban agglomeration, topological network analysis and social network analysis were used to assess the connectivity and distribution pattern of ecological recreation space-regional greenway network. The results show that: 1) The α, β, and γ indices are 0, 0.386, and 0.129 respectively, indicating a low-circuitry and low-connectivity topological structure of the network. 2) The network is clustered, and the degree of connectivity of the cohesive subgroups at the edge is higher than that of the central region. 3) The degree of connectivity between the cohesive subgroups in the eastern and northern regions is greater than that of the cohesive subgroups in the western region, and the connectivity between the western subgroups and eastern subgroups is low, suggesting that the network is fragmented in the east-west direction. 4) The distribution pattern of the connectivity is formed under the influences of the greenway development policy and layout, the greenway construction mechanism, the agglomeration pattern of ecological recreation spaces, geographical barriers, and spatial proximity. Several pathways were proposed to construct an ecological recreation space-greenway network with higher connectivity, for providing some references for the planning and development of China's urban agglomerations.