College of Landscape Architecture, Northeast Forestry University, Harbin 150000, China.
Key Lab for Garden Plant Germplasm Development & Landscape Eco-Restoration in Cold Regions of Heilongjiang Province, Harbin 150000, China.
Int J Environ Res Public Health. 2021 Feb 3;18(4):1427. doi: 10.3390/ijerph18041427.
Habitat destruction and declining ecosystem service levels caused by urban expansion have led to increased ecological risks in cities, and ecological network optimization has become the main way to resolve this contradiction. Here, we used landscape patterns, meteorological and hydrological data as data sources, applied the complex network theory, landscape ecology, and spatial analysis technology, a quantitative analysis of the current state of landscape pattern characteristics in the central district of Harbin was conducted. The minimum cumulative resistance was used to extract the ecological network of the study area. Optimized the ecological network by edge-adding of the complex network theory, compared the optimizing effects of different edge-adding strategies by using robustness analysis, and put forward an effective way to optimize the ecological network of the study area. The results demonstrate that: The ecological patches of Daowai, Xiangfang, Nangang, and other old districts in the study area are small in size, fewer in number, strongly fragmented, with a single external morphology, and high internal porosity. While the ecological patches in the new districts of Songbei, Hulan, and Acheng have a relatively good foundation. And ecological network connectivity in the study area is generally poor, the ecological corridors are relatively sparse and scattered, the connections between various ecological sources of the corridors are not close. Comparing different edge-adding strategies of complex network theory, the low-degree-first strategy has the most outstanding performance in the robustness test. The low-degree-first strategy was used to optimize the ecological network of the study area, 43 ecological corridors are added. After the optimization, the large and the small ecological corridors are evenly distributed to form a complete network, the optimized ecological network will be significantly more connected, resilient, and resistant to interference, the ecological flow transmission will be more efficient.
城市扩张导致的栖息地破坏和生态系统服务水平下降，增加了城市的生态风险，生态网络优化已成为解决这一矛盾的主要途径。在这里，我们使用景观格局、气象和水文数据作为数据源，应用复杂网络理论、景观生态学和空间分析技术，对哈尔滨市中心区的景观格局特征进行了定量分析。采用最小累积阻力法提取研究区的生态网络，运用复杂网络理论的边添加方法对生态网络进行优化，并通过稳健性分析比较不同边添加策略的优化效果，提出了优化研究区生态网络的有效方法。结果表明：研究区道外、香坊、南岗等老城区的生态斑块面积小、数量少、强烈破碎化、外部形态单一、内部孔隙率高；而松北、呼兰、阿城等新城区的生态斑块则具有较好的基础。研究区的生态网络连通性普遍较差，生态廊道较为稀疏分散，廊道内各种生态源之间的连接不够紧密。比较复杂网络理论的不同边添加策略，低度优先策略在稳健性测试中表现最为突出。采用低度优先策略对研究区的生态网络进行优化，增加了 43 条生态廊道。优化后，大、小生态廊道均匀分布，形成完整的网络，优化后的生态网络将显著更加连通、有弹性和抗干扰，生态流传输将更加高效。
