Research On Characteristics And Driving Forces Of Land Use Change In Changsha City From 1995 To 2015

With the development of economy,Land-Use and Land-Cover Change(LUCC)is becoming one of the most important contents in the world.In this study,the Landsat 8 remote sensing image data of 2015 were selected,and the land use status data and the land use status map of Changsha City were obtained by using remote sensing software ENVI to obtain the land use status data and land use vector data of four periods in2010.The change characteristics of land use in Changsha City from 1995 to2015 were analyzed by using GIS software ArcGIS to obtain the change data of land use types in five periods.At the same time,using the theoretical method of intensity analysis of land use change,this paper discusses and studies the changes of land use in Changsha during the past 20 years,so as to analyze the stability of land use and analyze the process of land use change in a systematic way.It is helpful to further excavate the information of land use change and to explain the process of land use change.At the same time,using the theoretical method of intensity analysis of land use change,this paper discusses and studies the changes of land use in Changsha during the past 20 years,so as to analyze the stability of land use and analyze the process of land use change in a systematic way.It is helpful to further excavate the information of land use change and to explain the process of land use change.The main conclusions of study:(1)In the period of 1995-2015,the largest proportion of land use in Changsha is woodland,the average 729613.6ha is about 62% of the total area.The largest proportion of land to land area is woodland,followed by forest land,cultivated land,construction land,water area,grassland(garden land)and unused land.The main characteristics of the transformation of each geographical class are as follows: other land use land?construction land,cultivated land?forest land,unused land?other land use land.Among them,the conversion of cultivated land into construction land is the most obvious,and the transfer area is large.During the study period,the absolutevalue of a single dynamic attitude was the largest in unused areas,with a value of 43.51.The smallest absolute value of a single dynamic attitude is unused land,with a value of 0.00.(2)During the period from 1995 to 2015,the results of intensity analysis at the interval level show that the land use change in Changsha is unstable.Before 2000,the intensity of land use change was small,and the change of land use was not active.After 2000,the intensity of land use change in Changsha gradually increased,except that the intensity of land use change in 2010-2015,the other stages were all less than the average intensity,and the land use change was gradually active.From the intensity analysis at the level of the type of feature,it can be seen that the amount of land used for construction increases in the whole study period,the increasing and decreasing intensity are more than the total average change intensity,so the change of the construction land in the whole time interval is active;The increasing and decreasing intensity of forest land in the whole time period are less than the total average change intensity,so the change of forest land in the whole time interval is stable;The increase or decrease of the intensity of the other four types of land showed different intensity variation trend in the four stages.(3)To explore the driving forces of land use change in Changsha City,there are four driving forces: nature,population,social economy and policy factors,the most critical of which is population,social economy and policy factors.