【目的】跨界地区生态安全格局的构建是保障区域生态安全以及高质量发展的关键,通过构建跨区域的生态网络,揭示快速城市化进程中生态屏障功能退化与空间异质性特征,促进生态源地间的完整性、连通性、稳定性,为跨省域城市群生态安全格局的保护与优化提供科学依据。【方法】以南京-合肥双都市圈为研究区域,对比分析了2000、2010、2020年3个时期生态安全格局的时空格局变化特征,根据生态源地具有可逆性的特点选择恢复和新增的生态源地,对区域的生态安全格局进行优化,结合区域生态本底提出国土空间保护修复格局,探究跨界地区生态网络协同治理路径。【结果】①2000—2020年研究区生态源地数量逐年减少,总面积稳定上升;②2000—2020年研究区生境质量整体处于中等水平且呈现衰退的趋势,而生态综合阻力逐渐升高;③3个时期生态廊道数量先增加后减少,生态节点逐年增加,研究区东部生态廊道匮乏;④2000—2020年研究区域高优先级生态廊道数量先增后减,总体呈现倒“T”形空间分布格局,生态网络结构也愈发脆弱;⑤结合研究区域自然生态本底的空间分布与优化后生态安全格局,提出“多核四廊三屏两带一心”的国土空间保护修复格局,并探索跨界地区的生态环境协同治理的建设路径。【结论】本研究从时空变化的角度,考虑南京-合肥双都市圈生态网络的整体性,结合区域生态本底的实际情况进行生态安全格局的优化并提出国土空间保护修复对策,可为南京-合肥双都市圈生态安全和国土空间跨区域保护修复提供理论依据和技术参考。

【Objective】The construction of an ecological security pattern in cross-border areas is the key to ensuring regional ecological security and high-quality development. By building an ecological network across regions, this study reveals the degradation and spatial heterogeneity characteristics of ecological barriers in the process of rapid urbanization, promotes the integrity, connectivity and stability among ecological sources, and provides a scientific basis for the protection and optimization of the ecological security pattern of cross-provincial urban agglomerations.【Method】Taking the Nanjing-Hefei metropolitan area as the research area, the spatio-temporal pattern changes of the ecological security pattern in 2000, 2010 and 2020 were compared and analyzed. Based on the reversible nature of ecological sources, the restored and newly added ecological sources were selected to optimize the regional ecological security pattern. Combined with the regional ecological background, the protection and restoration pattern of territorial space was proposed, and the collaborative governance path of the ecological network in the cross-border area was explored.【Result】(1)The number of ecological sources in the study area decreased year by year from 2000 to 2020, while the total area remained stable and increased. (2)The overall habitat quality in the study area was at a medium level from 2000 to 2020 and showed a declining trend, while the ecological resistance gradually increased.(3)The number of ecological corridors increased first and then decreased in the three periods, and the number of ecological nodes increased year by year. The eastern part of the study area was lacking in ecological corridors.(4)The number of high-priority ecological corridors in the study area increased first and then decreased from 2000 to 2020, and the overall spatial distribution pattern was an inverted “T” shape. The ecological network structure became increasingly fragile.(5)Combining the spatial distribution of the natural ecological background of the study area and the optimized ecological security pattern, the protection and restoration pattern of territorial space was proposed as “multiple cores, four corridors, three screens, two belts and one center”, and the construction path of collaborative governance of the ecological environment in the cross-border area was explored.【Conclusion】This study considers the integrity of the ecological network of the Nanjing-Hefei metropolitan area from the perspective of spatiotemporal changes, and optimizes the ecological security pattern based on the actual situation of the regional ecological background. It also proposes measures for the protection and restoration of national land space, which can provide theoretical basis and technical reference for the ecological security and cross regional protection and restoration of national land space in the Nanjing-Hefei metropolitan area.