基于Circuit理论的城市生态安全格局研究——以安庆市为例

Constructing the Urban Ecological Security Pattern of Anqing City by Circuit Theory

生态安全格局构建是保障区域生态安全,协调经济社会发展与生态系统矛盾,提升人类福祉的重要途径之一。以安庆市为实证区,通过生态系统服务功能评估识别区域生态源地,运用电路理论构建生态安全格局,根据电流密度解释区域生态安全格局结构特征,并提出区域生态网络与生态安全的优化策略。研究结果表明:安庆市生态安全格局包括24个大于1 km^2的生态源地、3条潜在廊道、23个夹点区域以及3个重要的障碍点,生态源地主要由林地与耕地构成。生态资源本底较好的区域主要分布在城市北部的大龙山森林公园沿线、东部开发区边缘地区及西部农场区域,中心城区生态资源流通受阻,生态廊道连通性较差,生态安全格局空间异质性特征显著。该研究通过对不同阈值下的生态网络安全进行分析,提出对不同网络格局下的生态系统改善、修复策略,对于提高区域生态系统服务的供给能力与生态网络的连通性具有积极的实践指导意义。

The construction of ecological network pattern is one of the important ways to ensure regional ecological security,to coordinate economic and social development and ecological system contradictions,and to enhance human well-being.This study takes Anqing City as an empirical area,identifies the regional ecological sources by evaluating the ecosystem service functions,and then uses the circuit theory to construct the ecological network pattern,demonstrates the regional ecological network structure characteristics according to the current density,and finally proposes the regional ecological network and Ecological security optimization strategies.The results of this study indicate that the ecological network structure of Anqing City is mainly composed of 24 source sites larger than 1 km^2,3 potential corridors,23 pinch points and 3 important obstacles.The ecological sources are mainly composed of forest land and cultivated land.The areas with better ecological resources are mainly distributed along the Dalongshan Forest Park in the north of the city,the edge area of the eastern development zone and the western farm area.The ecological resource flow in the central urban area is blocked,the ecological corridor connectivity is poor,and the ecological network pattern is significantly heterogeneous.This study analyzes the ecological network security under different thresholds,proposes the ecosystem improvement and restoration strategies under different network patterns,and has positive practical guiding implication for improving the supply capacity of regional ecosystem services and the connectivity of ecological networks.