National Spatial Optimization Based On Land Resource Carrying Capacity Evaluation

With the continuous development of China's new urbanization and urban-rural integration construction,The city scale expands unceasingly,the problem of farmland protection,Soil and water loss and ecological environment protection becomes more and more serious,The existing spatial distribution of land falls behind the current demand for economic and social development,and it is urgent to adjust and optimize the spatial distribution of land,adjust the land use structure reasonably,and promote the efficient and intensive use of land.At present,the study on Optimization of national spatial mostly focus on land space optimization based on the suitability evaluation of land space development,and seldom link the evaluation of land resources carrying capacity with the optimization of land space to carry out research and demonstration.The carrying capacity of land resources is the supporting of land resources to human social and economic activities in a certain region and in a certain period of time.The carrying capacity of land resources restricts the intensity of land development.Only by comprehensively understanding the background,status and potential of the carrying capacity of land resources,can we optimize the land use layout more reasonably and put forward a more targeted land spatial optimization layout scheme.On the basis of analyzing the natural conditions and economic development of the research area,the evaluation index system is constructed with the particle swarm optimization projection pursuit method,from four aspects of land,economy,society and ecology.and the carrying capacity of land resources of 162administrative villages and communities in ningming county was evaluated.determine the carrying capacity of land resources of each evaluation unit.According to the evaluation results,using the natural breakpoint method of Arcgis to divide the carrying capacity of land resources in ningming county into three grades:high,medium and low.On the basis of the bearing capacity of land resources,the three-dimensional rubik's cube model is applied to divide the functional zoning of land use,then using cluster analysis method combined with local natural conditions and economic development situation to further optimize the land space of Ningming county and put forward the optimization development plan and development guidance.Through research and analysis,the following conclusions are drawn:(1)Ningming county land resources carrying capacity evaluation results can be divided into three grades:high,medium and low.Among them,The research results show that the total area of the high grade land resource carrying capacity area of Ningming county is 127979.02m~2,it accounts for 37.99 of the total evaluation area.Mainly distributed in the Tingliang,Mingjiang town and in the north of Nakan,Haiyuan Zhaian,Nanan township.The total area of the middle grade land resource carrying capacity area is 91647.626m~2,accounting for 27.21 of the total evaluation area.Mainly distributed in the Chengzhong,Tingliang,Aidian,Bangun and Shilang township.The total area of the low-grade land resource bearing capacity area is 117,184.215 m~2,accounting for 34.80 percent of the total evaluation area.Mainly distributed in Shilang,Tongmian and in the south of Nakan town.(2)The functional zoning of land use in Ningming county was obtained by using three-dimensional rubik's cube graphic method.Based on the carrying capacity of land resources,through Three-dimensional rubik's cube model to get optimize development zones,key development zones,moderate development zones and ecological conservation zones.The dominant function and development direction of land use in each subdistrict were established.Effectively coordinate the balance between land use and development intensity to improve land use efficiency.(3)It also puts forward the optimal zoning scheme and zoning development guidelines for Ningming county.Using systematic clustering method,combining with local natural conditions,social and economic development,The land space divided into 8 zones:economic and industrial optimization zone,land development optimization zone,key economic development zone,undertaking development zone,main agricultural production area,main forestry production area,nature reserve and general ecological reserve.And last,put forward the zoning development guidelines on the basis of functional zoning of land use.last,Different development guidelines are proposed for different districts.