Study On Land Use Change And Its Performance Evaluation In Guiyang City

The degree of land resources security is an important factor affecting the speed and quality of the urbanization process in China.The inconsistency between the total amount of land resources supply and the growth of urban construction land demand,which affects the speed of urbanization.The rapid expansion of urban land scale and the inefficient land use not only affect the quality of urbanization,but also limit the improvement of land use performance.In recent years,the urbanization rate of guiyang city keeps improving,and the scale of urban construction land expands rapidly.Carrying out land use change and its performance dynamic evaluation research,explore the rationality of land use structure and layout adjustment.It is of great significance to promote the scientific,rational and efficient use of land resources,and to balance the speed and quality of the urbanization process.In this paper,remote sensing and GIS technology are used to extract land use and change information.Based on remote sensing software ENVI,the land use information of guiyang city is extracted by using decision tree classification method based on expert knowledge.Data analysis and attribute editing of extracted land use information were carried out through ARCGIS software.Obtaining land use and its changes information in Guiyang City in 2004,2009,and 2016,and processing the maps,all of this will became the basis for the analysis of land use changes in this paper.Through the study of land use change in Guiyang City,the following conclusions have been drawn:The trend of disordered land use structure adjustment is gradually emerging in guiyang;the change characteristics of construction land and green space are mainly manifested in spatial expansion;the change characteristics of cultivated land and water area are mainly spatial shrinkage;unexploited changes take into account space expansion and space contraction,and the characteristics of spatio-temporal changes are not obvious;increased ecological risk index indicates an increase in the possibility of ecological risks due to land use changes.Through the construction of land use structure + land use efficiency + land use effectiveness + ecological sustainability evaluation index system,the author made an empirical study on the dynamic change of land use performance based on land use change.Based on the coordination function model,measure land use performancecoordination level,and the main obstacle factors of land use performance were diagnosed based on the degree of obstruction model.The conclusions are as follows:the level of land use performance keeps rising,and the increase range of performance of different indicator layers is different;the internal coordination of land use performance system has experienced the change process of coordination--coordination good--weak coordination;the obstacles of land use structure performance and ecological sustainability performance system were increasing during the research period;and the obstacles of land use efficiency and benefit performance system declined continuously,and the main obstacle factors of land use performance in different periods were different.Based on the above evaluation and analysis results,Explore the main problems of land use performance in guiyang:the development of land use performance system is unbalanced and uncoordinated;land use structure adjustment is not reasonable;the land use investment structure is not reasonable;there are structural obstacles to the growth of land use efficiency;urban ecological construction has a long way.Based on the above issues,suggestions are proposed to improve the performance of land use in Guiyang City: build an effective government to promote coordinated development of the land use performance system;strengthen the top-level design to guide the rational adjustment of land use structure through planning;optimizing and adjusting the input structure of land use and excavating the potential of land use efficiency;promote supply-side structural reforms and improve land use efficiency;strengthen the ecological construction in the process of urban land use.