Spatio-Temporal Evolution and Multi-Scenario Simulation of Land Use Landscape Pattern in the Main Urban Area of Changsha City
As an important node city and a mega city in the middle reaches of the Yangtze River,the study on the land use pattern in the main urban area of Changsha is of great significance to the future urban construction.This study is based on the land use classification data of the main urban area in Changsha in 2000,2005,2010,2015,and 2020,and adopts research methods such as expansion intensity index,land use dynamic degree,land-scape pattern index,Markov prediction model,and GeoSOS-FLUS model.The research results are as follows.(1)From the perspective of the expansion strength index,the expansion intensity and extension rate of the main urban area in Changsha from 2000 to 2020 are not stable.(2)From the perspective of land use dynamic attitude,the annual average land use of grass and impermeable plots is the largest and the expansion is the most intense,while the expansion of farmland is far from the grassland due to the differences in area.(3)From the perspective of land use dynamics,the main urban area in Changsha has experienced rapid development of impermeable plots at the cost of forest and natural water erosion during the construction process,while forest land is slowly recovering.(4)The GeoSOS-FLUS multi-scenario simulation and prediction model can effectively simulate the future expansion of urban land in the main urban area of Changsha.Taking into account the three scenarios of natural development,economic growth,and ecological protection,farmland and impermeable plots generally exhibit a trend of expansion around natural water bodies.In areas without natural water bodies,the expansion trend of the two types of land is not obvious.Due to the near saturation of impermeable plots and farmland in the central area of the main urban are-a,the main trend in the future is to expand towards the eastern and northeastern regions with more forests.
land use patternGeoSOS-FLUS modelsimulationChangsha city
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