Simulation and control of the evolution of construction land in Changzhutan metropolitan area under the constraints of ecological security pattern

With the rapid development of urbanization, the contradiction between construction land and ecological land has become increasingly prominent. Controlling the expansion of urban construction land from the perspective of ecological security is the embodiment of ecological priority and green development in land and space planning in the new era. Changzhutan metropolitan area was selected as the research object, and the changes in construction land from 2000 to 2020 were identified through remote sensing data. The comprehensive ecological importance assessment model and the minimal cumulative resistance (MCR) model were used to construct the ecological security pattern of the metropolitan area. Based on the future land use change scenario simulation (FLUS) model, three construction land simulation scenarios of natural development (ND), core ecological block protection (CEP), and ecological security pattern restriction (ESPR) were set up. And the urban development boundary of Changzhutan metropolitan area was delineated on the basis of the simulation results. The results showed that from 2000 to 2020, the construction land in Changzhutan metropolitan area expanded very rapidly, and gradually changed from rapid and disorderly expansion to slow and concentrated expansion. By using the comprehensive ecological importance evaluation, it was concluded that the extremely important ecological land was 2 649.54 km², the ecological source area was 1 204.38 km², accounting for 13.97% of the total area of the study area, and the comprehensive ecological security pattern of Changzhutan metropolitan area was constructed. Under the three scenarios of ND, CEP and ESPR, the scale of construction land reached 1 345.88 km², 1 345.79 km² and 1 284.94 km², respectively. The delineation of urban development boundaries based on ESPR scenarios could effectively maximize land economy and ecological benefits, and provide references for ecological protection and land use planning in the region.