Research On The Optimization Of Geographical Spatial Structure And Pattern In Qinglong County Based On GMDP And CA-Markov Models

Since the reform and opening-up,great changes have been taken place in the natural and social economic pattern.A host of regional problems followed.The contradiction between social economy and resource environment is increasingly prominent.The harmony between man and nature has been destroyed to a certain extent.On the basis of limited land resources,how to promote the comprehensive development of economy,social development and ecological environment protection through structure and layout regulation has become a problem.It is an important task of current geographical space planning to realize the maximization of regional comprehensive benefits.The GMDP model has the function of data prediction.The CA-Markov model has a spatial simulation function.This study combines the two models.Taking Qinglong County as an example,this paper analyzes the spatial pattern transfer characteristics of Qinglong County.In the case of better simulation effect of 2018,CA-Markov model was used to simulate the spatial pattern of Qinglong County in 2022.The optimized structure of Qinglong County in 2022 was obtained by using GMDP and CA-Markov model.On the basis of the specific studies the quantity structure and space layout optimization configuration problems.The final results are compared and analyzed.The following conclusions were drawn:(1)During the study period,the changes of geographic spatial structure in Qinglong County showed the rule of "two rises,two falls and one fluctuates" in terms of area.During 2010-2014 and 2014-2018,the area of urban development space and rural living space increased.The area of ecological water space and ecological land space decreased.The land area of agricultural production space increased first and then decreased.From the perspective of land structure,the ecological land space is the most important space type.The ecological land area accounts for more than 70%of the total land area.From the perspective of dynamic attitude,the comprehensive dynamic change was small during the research period.From the perspective of space transfer characteristics,the ecological space was transferred to urban space and agricultural space.(2)In this paper,CA-Markov model is used to simulate the geospatial pattern of Qinglong County in 2018.By cross-comparing with the current data of the research area in 2018,the simulation accuracy is 92.10%.The simulation result of the model is very good.The result shows that the CA-Markov model can better simulate the geographic spatial pattern.The CA-Markov model is used to simulate the geographical spatial pattern of Qinglong County in 2022.Compared with the current situation in 2018,the land area of urban space and agricultural space had increased significantly.The urban development space increased by 1657.70hm2.The rural living space increased by 5646.33hm2.The agricultural production space increased by 539.15hm2.The ecological land space was greatly reduced,with a reduction area of 7,843.17hm2.(3)In this paper,the aim is to maximize the regional comprehensive benefit.The GMDP model and ca-markov model are used to optimize the structure and layout of geographical space.The optimization results show that the urban development space area of Qinglong County in 2022 is 4078.53hm2.The rural living space and agricultural production space are respectively 8894.61hm2 and 83416.53hm2.The space areas of ecological waters and ecological land are respectively 8794.32hm2 and 245,429.30 hm2.Compared with the simulation results,the urban space and agricultural space after optimization are no longer disorderly expansion.The spatial layout is more reasonable.The optimization results are more in line with the development orientation of Qinglong County as "Beijing-Tianjin-Hebei Important Ecological Conservation Area".The economic benefit of Qinglong County reached 13.942 billion yuan by optimization.Compared with 201 8,the economic benefit increased by 812 million yuan.The ecological benefit reached 15.095 billion yuan,an increase of 1.510 billion yuan compared with before optimization.Compared with the result of simulation,the economic benefit decreased by 0.179 billion yuan.The ecological benefit incresaed 0.330 billion yuan.The ecological benefits were significantly improved.The comprehensive benefits have been improved.This study is helpful to gain a deeper understanding of the characteristics of the change of geographical space of Qinglong Manchu Autonomous County.In this way,the geographical spatial structure and layout can be optimized with the aim of giving consideration to the optimal regional comprehensive benefits.This provides support and basis for Qinglong Manchu Autonomous County to formulate policies for the optimal allocation of county territory space.