基于MSPA-生境质量评估和电路理论的城市绿色基础设施网络优化研究——以深圳市为例

Optimization of Urban Green Infrastructure Network Based on MSPA–Habitat Quality Assessment and Circuit Theory:Case of Shenzhen

城市绿色基础设施对缓解生态环境问题、确保人居环境安全和促进城市可持续发展有重要作用。以深圳市域为研究区域,采用形态学空间格局分析法(MSPA)和InVEST生境质量评估模型来识别生态源地,利用电路理论提取生态廊道并识别生态夹点和障碍点,构建城市绿色基础设施网络并提出优化策略。深圳城市绿色基础设施网络由56个生态源地、79条生态廊道、面积约71.69 km^(2)的生态夹点和180.12 km^(2)的生态障碍点构成。生态源地主要分布在东南部和中西部的山体、林地等生态质量较高的区域;生态廊道主要分布在中西部和东北部等地区;生态源地间普遍存在生态夹点,主要分布在中西部、西南部及东北部;生态障碍点多位于生态源地的边缘或生态廊道内部,主要分布在西南部、中部及东北部。从生态源地、廊道和夹点的保护与质量提升,生态障碍点的修复,生态修复优先区的界定与分级三方面,提出城市绿色基础设施网络优化策略,为深圳城市绿色基础设施网络的构建与优化提供方法支撑和实践指导。

Green infrastructure is crucial in mitigating ecological environmental problems,ensuring the safety of human settlements,and promoting sustainable development.With Shenzhen as the study area,ecological source patches were identified through the morphological spatial pattern analysis(MSPA)and habitat quality assessment using the InVEST model.Then,the circuit theory was applied to extract ecological corridors and identify ecological pinch points and obstacles.Based on the spatial characteristics of these patches,corridors and pinch points,an urban green infrastructure network was constructed,and optimization strategies for this network were proposed.The findings indicate that the UGI network in Shenzhen encompasses 56 ecological source patches,279 ecological corridors,71.69 km of ecological pinch points,and 180.12 km^(2) of ecological obstacles.These ecological source patches are concentrated in regions with high ecological quality,such as mountains and forests in the southeast,central,and western parts of the city.Ecological corridors are mainly located in the central,western,and northeastern regions.Ecological pinch points,which are prevalent among ecological patches,are primarily distributed in the central,southwestern,and northeastern areas.Most of the ecological obstacles are located along the periphery of ecological source patches or within ecological corridors,mainly in the southwestern,central,and northeastern areas.From three aspects,the protection and quality improvement of ecological patches,corridors,and pinch points,the restoration of ecological obstacle points,and the prioritization of areas for ecological restoration,optimization strategies for Shenzhen's urban green infrastructure network are proposed.This research provides methodological support and practical guidance for the optimization of urban green infrastructure network in Shenzhen.