The Analysis Of Spatial Heterogeneity And Land Carrying Capacity Of Land Use In Maoxian County

With the economical development and increase of population,the conflict is gradually apparent between the development of land use restrained by limited land resource and land conditions and the scarce land resource.The relationship between people and land is in tension in the alpine alley region,due to the complicated natural environment,fragile ecosystem,and constant natural disasters.In this way,it is necessary to learn about the spatial heterogeneity and influence factor of land use,land carrying capacity in a scientific way,as well as optimize layout of land use.This thesis takes Maoxian County of Aba Tibetan and Qiang Autonomous Prefecture as the research object,based on related domestic and international scholarship,with the methods of field study,landscape pattern analysis,spatial analysis of GIS,in order to study its layout and optimization for providing theory and strategic reference of land-use and layout planning in Maoxian County.According to the data analysis of economy and land use in Maoxian County,its village and town area are the main land utilization for construction land,accounted for over 80%.With the field study,it is obvious to find some problems of village and town land use,including scattered arrangement of land use,large land area per capita,discarded rural land in remote and high altitude villages,and land use gathered in valley area,and the land use liable to be influenced by natural disasters.On the basis of analyzing spatial heterogeneity of land use in Maoxian County,its land spatial distribution is a type of highly agglomerate distribution mode which the core area is distributed in the valleys of southern Min river and Fu river.On the whole,the dense area is located at the southern and central area,while the sparse one in the northern area.In terms of land scale distribution,it is characteristic of large scale and small scale with high density as well as small scale with low density.In terms of pattern and landscape organization,the land-use pattern is normal in each villages and towns of Maoxian County featured with the land patch of good continuity;while land fragmentation is of great difference that the western towns and villages are more fragmented than the Eastern.In accordance with former scholarships,this paper analyzes the ten influence factors for land distribution in terms of natural environment,economy and resources.According to the research results,the land spatial distribution tends to the low altitude area and area with gentle slope.At the same time,the natural disasters also exert pressure on the land spatial distribution.In the aspect of society,the area of large population,high density and good economical development is also of importance for land spatial distribution.In particular,it is obvious that the land use of villages and towns gather along the roads.In the aspect of resources,the land use has the tendency to be close to water source and distributed in farm land.This thesis evaluates the suitability of land use in Maoxian County by the standard of influence factors of distribution of land use,applying mean square error method to confirm index balance and Arc GIS for overlay analysis and algebraic operation.This thesis,with the present land-use condition,measures the land development intensity,present development level,present matched-degree of land arrangement,and land-use pressure.It shows that the land-use pressure of 14 villages and towns is small and 6 ones is large.However,there is one village’s pressure in process of transforming to be large.Simultaneously,the pressure state index is used to determine the bearing state of land development in towns and villages;by calculating the bearing population of cultivated land area and water resources in Maoxian County,and comparing the current population in Maoxian county to determine the bearing state of cultivated land and water resources,it is finally determined that 10 towns in Maoxian county are overloaded and 11 towns are loadable.At the same time,according to the evaluation results of village and town land suitability and the characteristics of patch space differentiation,the optimization model of village and town land in Maoxian county is divided into three types: urbanization agglomeration,key development,reclamation and internal integration.The typical cases are analyzed in order to provide reference for village and town land optimization.