摘要
Background The urban green infrastructure(GI)network is an important conduit for ecological fows and plays a crucial role in improving regional habitats,especially in karst areas that are highly ecologically fragile and sensitive.However,the existing research only focuses on the construction of GI network in karst mountain cities,and the evolution characteristics of its elements and driving mechanism are not clear,which is of great signifcance for guiding urban land use planning and comprehensively improving the quality of the ecological environment.In view of this,this study took Qianzhong urban agglomeration as the study area,based on multi-source data,and identifed ecological sources through ecological resilience analysis.Considering the special geographic environment,the rock exposure rate factor was added to correct the resistance surface,and the minimum cumulative resistance(MCR)and gravity model were coupled to extract the GI network.The complex network topology characterization parameter was introduced to assess the spatial and temporal variations of ecological sources and corridors.Finally,the geographical detector was used to identify the dominant infuencing factors and interactions of the spatial distribution of the GI network.Results The results showed that from 2000 to 2020,the condition of GI network elements in the study area presented a decreasing and then an increasing trend.The ecological sources or corridors in highly urbanized areas were critical for ecological fow transport and the overall structural stability of the GI network.The infuence of natural factors on the spatial distribution of the GI network gradually weakened,and the infuence of human factors continuously increased.The spatial distribution of the GI network was infuenced by multiple factors,and the interaction between all the factors was enhanced,which gradually changed from the interaction of natural factors to the interaction of human factors during the study period.Conclusions The research results will provide scientifc references for the construction of an ecologically safe environment and sustainable development of karst mountain cities.
基金
supported by the Fundamental Research Funds for the Central Universities,Northeast Forestry University(2572018CP06,2572017CA12)
the Guizhou University Renjihezi(2023)No.34(Natural Science).
