Simulation and prediction of multi-scenario evolution of ecological space based on FLUS model: A case study of the Yangtze River Economic Belt, China

Building the Yangtze River Economic Belt (YREB) is one of China's three national development policies in the new era. The ecological environment of the Yangtze River Economic Belt must be protected not only for regional economic development but also for regional ecological security and ecological progress in this region. This paper takes the ecological space of the Yangtze River Economic Belt as the research object, based on land use data in 2010 and 2015, and uses the FLUS model to simulate and predict the ecological space of the research area in 2035. The variation of the research area's ecological space area and its four sub-zones has remarkable stability under diverse situations. Both the production space priority scenarios (S1) and living space priority scenarios (S2) saw a fall in ecological space area, with the former experiencing the highest reduction (a total reduction of 25,212 km(2)). Under the ecological space priority scenarios (S3) and comprehensive space optimization scenario (S4), the ecological space area increased, and the ecological space area expanded even more under the former scenario (a total growth of 23,648 km(2)). In Yunnan-Guizhou, the ecological space is relatively stable, with minimal signs of change. In Sichuan-Chongqing, the Sichuan Basin, Zoige Grassland, and Longmen Mountains were significant regions of area changes in ecological space. In the middle reaches of the Yangtze River, the ecological space changes mainly occur in the Wuyi Mountains, Mufu Mountains, and Dabie Mountains, as well as the surrounding waters of Dongting Lake. The Yangtze River Delta's changes were mainly observed in the eastern Dabie Mountains and Jianghuai Hills.