China 2 Ecology Agglomeration 1 Beijing [China] 1 Beijing-Tianjin-Hebei urban agglomeration (BTH) 1 Beijing-tianjin-hebei urban agglomeration (BTH) 1 Biodiversity 1 Complex nexus 1 Comprehensive effect 1 Development modes 1 Ecological networks 1 Ecological security 1 Ecological security index 1 Ecological security index (ESI) 1 Economics 1 Hebei 1 Landscape connectivities 1 Landscape pattern indexes 1 Landscape pattern indices 1 MCR 1 Rapid urbanizations 1 Scenario simulation 1 Scenario simulations 1 Security indices 1 System dynamics model 1 System dynamics modelling 1 System theory 1 Tianjin 1 Urban agglomerations 1 Urban ecological network 1