多维视角下天津市生态网络结构演变特征综合评价

以天津市为研究区,在构建2000、2010和2020年天津市生态网络的基础上,运用复杂网络的评价指标和景观格局指数并综合稳定性、均匀性和连通性指数,从源地-廊道-节点-整体多维度对其结构演变进行综合评价。结果表明: 2000—2020年间,天津市生态源地的萎缩退化现象严重且空间分布不均匀,生态廊道也越来越稀疏;景观破碎度和形状复杂度呈先上升后下降的态势;2000和2010年的廊道平均路径长度较短,生物流动效率相对较高;2000、2010、2020年重要度较高的节点数量分别占统计节点数量的35.7%、29.4%和21.4%;2020年的网络连通鲁棒性和脆弱鲁棒性均起伏较大且差异明显,网络稳定性最差;2010年的生态网络具有较高的连接性和较强的复杂程度,2000和2020年则较为一般;2000年的网络均匀程度最好,2010年次之,2020年最差。

Comprehensive evaluation of the evolution of ecological network structure in Tianjin,China from a multi-dimensional perspective.

Based on the construction of ecological network in Tianjin in 2000, 2010 and 2020, we evaluated the structural evolution of Tianjin ecological network from the multi-dimensional perspective of source-corridor-node-whole, using complex network evaluation index and landscape pattern index integrated with the stability, uniformity and connectivity indices. The results showed that from 2000 to 2020, the ecological source areas in Tianjin significantly shrank and degraded, be uneven in spatial distribution. Ecological corridors became sparse. Landscape fragmentation and shape complexity first increased and then decreased. The average length of corridors in 2000 and 2010 was shorter, with the bioflow efficiency being relatively high. In 2000, 2010, and 2020, the number of nodes with high significance accounted for 35.7%, 29.4% and 21.4% of the statistical nodes respectively. In 2020, the network connectivity robustness and vulnerability robustness showed substantial fluctuation, and the network was the most unstable. In 2010, the ecological network was of high connectivity and complexity, while in 2000 and 2020, it was more general. In 2000, the network uniformity was the highest, followed by 2010, and lowest in 2020.