平陆运河流域生态环境时空变化特征及生态安全评价OA

The mutual feedback mechanism between major infrastructure and ecological environment is a key scientific issue for achieving sustainable development.Taking the Pinglu Canal Basin as the object,this study integrated remote sensing data,statistical yearbooks,and Digital Elevation Models(DEM)to construct an ec-ological security evaluation system based on the"Pressure-State-Response"(PSR)framework.The spatio-temporal variation characteristics of the Environmental Sustainability Index(ESI)in the study area in 2005,2015,and 2025 were analyzed,and the dominant factors affecting ecological security were identified based on the obstacle degree model.The results are summarized as follows:① From 2005 to 2025,the areas of culti-vated land and water body kept decreasing,while those of forest and construction land increased by 979.79 km2 and 236.65 km2,respectively.Little changes were observed in areas of wetland and unutilized land.② ESI first increased and then decreased,with the proportion of high-value areas being 16.32%,18.53%,and 18.01%in 2005,2015,and 2025,respectively.There was a significant spatial difference in the overall ecologi-cal environment quality of the basin.③ The ecological security pattern presented significant spatial agglomer-ation,and the construction of major infrastructures such as ports and canals caused significant disturbance to the surrounding ecological environment.④ Population density,landscape diversity,road network density,vegetation coverage,and per capita disposable income were the main obstacles to ecological security.The ob-stacle degree of the pressure layer kept increasing;the obstacle degree of the response layer decreased;and the obstacle degree of the state layer showed fluctuations.Given the lagging nature of spatial spillover effects of major infrastructures,strengthening ecological monitoring and restoration measures throughout the construc-tion and operation periods is a necessary guarantee for achieving coordinated evolution of regional socio-econ-omy and ecological environment.