基于Linkage Mapper与复杂网络的成都市生态网络构建与优化

Construction and Optimization of Chengdu Ecological Network Based on Linkage Mapperand Complex Network

城市化速度加快,城镇内部生态斑块破碎,生态廊道隔断,区域可持续发展受到阻碍。构建生态网络可以连接破碎斑块,保护生物多样性与地域特色。以成都市为例,基于形态学空间格局分析(morphological spatial pattern analysis, MSPA)方法并结合景观连通度指数确定生态源地,从地形、景观结构、人类活动三方面确定阻力因子来构建综合阻力面,基于ArcGIS水文分析原理和linkageMapper识别生态廊道和生态节点,利用复杂网络增边优化理论,对研究区处于高阻力值且介中心性低的点进行模拟增边,最后对比增边前后的稳定性,验证增边效果。结果表明:1)成都市生态源地主要分布在西部林区,东部和中部较为稀疏。2)成都市阻力值呈现由中部向外部降低趋势,中心都市圈阻力值最高。3)基于GIS共提取111条生态廊道、209条辐射道、101个生态节点。4)识别出增边优化节点8个,成功模拟增加11条生态廊道,模拟增边优化后网络稳定性明显提升,网络连通性增强,网络结构整体更为稳定。

With the acceleration of urbanization,the ecological plaques inside cities and towns are fragmented,the ecological corridors are cut off,and the sustainable development of the region is hindered.Building an ecological network can connect broken patches and protect biodiversity and regional characteristics.Taking Chengdu as an example,this study used the morphological spatial pattern analysis(MSPA)method to determine the ecological source area combined with the landscape connectivity index.Resistance factors that were determined from morphology,landscape structure and human activities were used to construct resistance surface.Ecological corridors and nodes were identified based on the hydrological analysis principle of ArcGIS and linkage Mapper.The edge-adding of the points with high resistance value and low betweenness in the study area was simulated by using the complex network edge-adding optimization theory.The stabilities before and after the edge were compared to verify the effect of increasing the edge.The research results were as follows.1)The ecological sources of Chengdu were mainly distributed in the western forest area,and the eastern and central areas were relatively sparse.2)The resistance value of Chengdu showed a downward trend from the middle to the outside,and the resistance value of the central metropolitan area was the highest.3)Based on GIS,a total of 111 ecological corridors,209 radial corridors and 101 ecological nodes were extracted.4)Eight edge-added optimization nodes were identified,and 11 ecological corridors were successfully simulated.After the simulated edge-added optimization,the network stability was significantly improved,the network connectivity was enhanced,and the overall network structure was more stable.