| The intensity of land development is an important indicator of regional development and construction.It is usually characterized by the proportion of construction land to the total land area.According to international convention,the limit of land development intensity in a region is 30%.If this limit is exceeded,the living environment of human beings will be affected.In recent years,the intensity of land development in some cities in China has exceeded the international security line,which brought about various problems have aroused public concern.Therefore,the intensity of regional land development and its related researches play an important role in reasonably controlling land development intensity,optimizing the spatial structure of construction land,and ensuring food and ecological security.Based on the related concepts,theories and GIS technology,and based on the land use data of xi 'an in 2005,2010 and 2015,this paper evaluates the spatial-temporal differentiation and limits of land development intensity in Xi'an.Firstly,the measurement model of land development intensity is constructed and its size is calculated.The spatial and temporal characteristics of land development intensity in Xi'an are analyzed by using GIS spatial analysis method.Secondly,a multiple regression model is used to analyze the driving mechanism of land development intensity pattern change.Finally,the intensity of land development is analyzed.From the perspective of natural background constraints and three-person function space,a land development restrictive evaluation model is constructed to divide the development and construction restriction levels,and to measure the maximum extent of regional land development intensity and the remaining development intensity.The main conclusions include:(1)The overall situation of land use change in Xi'an is as follow: According to the analysis of scale and structure of land use,construction land in Xi'an is obviously increased from 2005 to 2015,and the area of cultivated land has decreased year by year.Meanwhile,the information entropy and equilibrium of land use structure have shown an upward trend.The continuous decline in dominance indicates that the land use structure is gradually moving towards a balanced development.(2)The spatial-temporal characteristics of land development intensity in Xi'an are as follows: The time-series analysis shows that the regional differences in land development intensity in Xi'an show a narrowing trend.Through space analysis,it is concluded that the intensity of land development in Xi'an shows a positive spatial autocorrelation and a strong spatial agglomeration.From 2005 to 2015,the spatial agglomeration of land development intensity in Xi'an shows the characteristics of increasing first and then weakening.Based on the standard deviation ellipse analysis,the focus of land development intensity in 2005-2015 presents the trend of change from northwest to northeast,covering the districts and counties with high land development intensity.(3)Through the analysis of the driving mechanism of land use intensity change in Xi'an City,it was found that the investment intensity of land use,industrial structure,urban development,and economic development level were the dominant factors affecting the intensity of land development in Xi'an.(4)Through the limit evaluation of land development intensity in Xi'an City,the maximum reasonable scale for development and construction in Xi'an is 25.442 million hectares,and the maximum of land development intensity is 25.20%.There are significant differences in the limits of land development intensity in all districts and counties. |
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