Simulation Of Land Use Change And Analysis Of Langscape Effects In Dali City

Land use / cover change is an important part of global environmental change,which is influencing and changing the structure and service function of the ecosystem of different scales.Understanding the future land use / cover change and its ecological effects under different policies and trends is of great significance for exploring sustainable land use and maintaining local ecological safety.Based on the data of land use status in 2014,and the delimit of the important ecological safety area in Dali and the change of the total amount of various of land use in the overall planning of the land use in Dali,4 different contextual model are built,and the distribution of land use in Dali in 2020 is simulated by using DLS model;then,the simulation results of 2020 in four modes are compared and analyzed,At the same time,from the perspective of landscape ecology,the Fragstats software was used to evaluate the results of the landscape index of 2 scales of patches and types of landscape in different models.The following conclusions are obtained through the study:1?The results of different models are different in the amount of land use,The increasing amount of construction land in Dali is mainly converted from woodland and cultivated land,but in different situations.The conversion of woodland and cultivated land does not have the same proportion of the total amount of land conversion in construction land.The highest proportion of cultivated land is circumstances 4,followed by circumstances 3,circumstances 1 and circumstances 2.2?The spatial distribution of land use in Dali in 2020 under different modes,the increase of construction land is mainly around the urban area of Dali City,Xiaguan district,regions bordering Haidong and Fengyi,and the middle area of the ancient city of Dali to the urban area of Dali.Relatively speaking,in the absence of control of important areas of ecological security,with the increase of the total amount of in Dali's planning and control construction land,the construction land is gradually expanded to the outside;But under the limits of the red line in important areas of ecological security,The increase in the total amount of construction land is affected by the restricted area,and the increased construction land is scattered in the Dali region.3?From the perspective of landscape ecology,no matter under what type of development model,on the pattern index of landscape patch type and overall landscape pattern index,The development results of Dali in 2020 are facing a trend of increased habitat fragmentation,declining connectivity and a decline in landscape diversity compared with 2014.The areas restricted by the important ecological security areas can mitigate the above ecological risks to a certain extent.4?In the case of an important area of ecological security,under the influence of the planning control quantity before and after.There is a certain difference in the pattern index of patch type in different land landscape;with the increase of construction land,the number of patch(NP)and patch density(PD)in construction land is higher than that of the original plan.It shows that the construction land fragmentation is further increased after the construction land is added.There is not much difference between the connectivity indicators and the overall indicators of other landscape patch types.However,compared with the two cases,which are not restricted by the important ecological safety area,all kinds of landscape plaque pattern index of various kinds of land are in the dominant position.5?In a restricted case of an important area of ecological security,and the influence of the planning controlled quantity before and after.There is not much difference in the calculation results of the overall landscape pattern index of the two,In general In terms of habitat fragmentation,connectivity and landscape diversity,the scenario results(situation 1)under the original planning control amount are slightly better than those of the revised planning situation(situation 2).But the indicators of situation 2 is better than situation 3 and situation 4.6?Under the control of the important area of ecological safety,the ecological landscape benefits of land use in Dali will be better than that without ecological restriction;At the same time,the revision of the total index of the total planning control in Dali makes little significant difference to the ecological benefits of the landscape of Dali.