Optimization Simulation Of City Land Use In The Context Of Ecological Security

Land,an essential material for human production,provides space for people to live in.In the course of social development,human beings intervene and manage the land in different ways,such as biological and technical means,so as to meet the needs of social development.Since the reform and opening up,China has experienced rapid economic growth and rapid urban expansion in the process of internationalization,information and marketization.While people are acquiring material civilization,there is also a phenomenon that land is difficult to be continuously and efficiently utilized and the ecological security is damaged.This situation isn't in harmony with the high quality development of the ecosystem required by the modernization and the whole society.Therefore,the Central Committee of the Communist Party of China and the State Council have determined strategic goals of optimizing the land use pattern and vigorously promoting the ecological civilization construction from the national level,required all areas to keep the ecological bottom line in the urban development,transformed the ways of land utilization,and established land use patterns which can promote the sustainable urban development.As a window of China's reform and opening up,Shenzhen is among the first to meet the problems of land ecological security and land use in urban development.This paper takes Shenzhen as the object of study,the relevant research results of which are of some practical significance to the maintenance of urban ecological security,the adjustment of the land structure and the optimization of land layout,which can provide basic support for Shenzhen city to delineate the urban development boundary and ecological red line,and can also provide experience for other cities in China.Considering all the above,based on the land use optimization theory,landscape ecology theory,ecological economic theory and sustainable development theory,this paper studies the simulation of land use optimization under the background of ecological safety with multi-disciplinary approach.The specific contents are as follows.(1)The purposes of the study.? to analyze the driving forces of land use change.An evaluation system is constructed to quantitatively analyze the process and trend of the driving factors' influence on land use change.? to explore the analysis method of land ecological security.On the basis of constructing the evaluation index system of land ecological security,the ecological security degree of land is evaluated synthetically,the response mechanism of land ecological security to land use change is discussed,and the land ecological safety control area is delineated.? to explore the optimization simulation method of land use space.Land ecological security is taken as the constraint condition of land use change,and the spatial layout of land use is simulated under the premise of ensuring land ecological security.(2)The research methods.? principal component analysis is used to analyze the driving forces of land use change.The methods of spatial econometric analysis,including the common least squares(OLS),space lag model(SLM)and spatial error model(SEM),are used to quantitatively analyze the influence mechanism of the driving force of land use change.? co-integration theory is used to analyze the response of land ecological security to the degree of land use.In addition,according to the principle of "source-sink" in land ecology,by means of the technology of surface diffusion,the minimum cumulative resistance model(MCR)is used to simulate the movement process of land unit,and to divide the ecological safety control area.? GM(1,1)grey model,CLUE-S model and FLUS model are used to predict the spatial pattern of land use in Shenzhen in 2030 in the scenarios of natural development,ecological security and ecological optimization.(3)The results of the study.? from 1996 to 2005,a large amount of land was changed into construction land,which slowed down from 2005 to 2015.The trend analysis of driving forces of land use change shows that the driving forces of social economy increase with time.The influence mechanism of driving forces of land use change shows that land use change is greatly influenced by economic development,technological innovation and population.?the co-integration analysis of land ecological security and land use degree shows that both of them are synchronously changed,in the state of equilibrium in the long term but fluctuation in the short term.? the spatial distribution of land use in the three scenarios shows that the expansion trend of construction land is effectively controlled under the scenario of ecological optimization,in which the proportion of land use with important ecological functions rises,and the structure and layout of various land use are optimized.(4)The conclusion of the study.? the scientific quantification of driving factors is the basis of the in-depth analysis of land use change.Because some factors are difficult to quantify,which affects the research of the driving forces of land use change,it is necessary to explore further the basic theories and research methods to meet the needs of the research.? scientific delineation of land ecological security control areas and rational utilization of land are the keys to ensuring the ecological safety of land.Due to the great influence of human activities on land ecological processes,various ecological factors should be considered comprehensively to make the land ecological security pattern more scientific.? in the simulation of the spatial distribution of land use,the layout of land use should be changed accordingly when the control area changes.In the future,the real-time monitoring of the control area and dynamic simulation of land use layout are needed from the technical perspective.In optimizing land use,making reasonable policies and implementing land use conversion are the keys to coordinating the relationship between land use and land ecological security.Therefore,policy proposals should be put forward from planning,industry and mechanism to coordinate the relationship between land use and land ecological security.