Construction land expansion simulation and landscape effect analysis of the urban agglomeration in central Yunnan

Carrying out the simulation of urban construction land expansion is an effective way to follow the objective law of land use change, taking into account cultivated land and ecological protection, and guiding the rational expansion of construction land. It is also an important attempt to find the coordination of land space layout between planning. Taking the urban agglomeration in central Yunnan as an example, this paper selects 2000, 2005, 2009 and 2015 as research periods to analyse the spatio-temporal expansion characteristics of construction land in whole region. The results show that the overall distribution of construction land is relatively dispersion at four time points, mainly along the northeast-southwest direction, and the distribution in the southwest direction is the most concentrated. Using FLUS model simulate the construction land spatial expansion pattern by 2020 under the scenarios of planning guidance and policy restraint, and analyze the ecological effects of spatial expansion. The simulation results show that the construction land expansion area under the two scenarios is continuously increased, but the degree of expansion is different. The construction land fragmentation degree and fractal dimension have been reduced compared with the previous, and the degree of intensive utilization of construction land is increased.