Spatial And Temporal Change And Driving Force Of Land Use In Nanchang From 2000 To 2017 Based On Remote Sensing Image

Based on the understanding of the research status of land use / cover change at home and abroad,formulate a technical route,use ENVI5.1 to process the remote sensing image maps of Nanchang 2000,2005,2010,and 2017,and obtain the land use status maps corresponding to the four years.And the land use type is determined to be 6 types,namely cultivated land,forest land,grassland,construction land,water area and other land.The land-use transfer matrix,land-use dynamics,and county-level change differences were obtained through Arc GIS 10.2 processing.Based on this,the changes in land use in Nanchang from 2000 to 2017 in time and space were analyzed.On this basis,a qualitative and quantitative analysis of the driving forces of land use change in Nanchang is made.The qualitative analysis is used to identify the influencing factors,and then the 18 social and economic indicators are selected to calculate the contribution of the driving factors.A multiple regression analysis method is used.Get the regression equation.Based on the research and analysis,the conclusions are as follows:(1)To analyze the spatial and temporal change of land use in Nanchang.In 2000-2017,the area of the other five types of land except construction land showed an overall trend of decrease,and the land with the largest single land use dynamic attitude was also construction land,whose transfer sources were mainly cultivated land,waters and other land.And the single land use dynamic attitude of grassland and other land,next to the construction land,farmland,waters and other land all show a trend of increasing and then decreasing.From the perspective of space,the land use change of each district and county in the study area is obviously different.The land use of construction land centered on the Ganjiang River has a relatively obvious trend of expansion in the east-west direction.The area of other land reduction is mainly concentrated in the northeast of the new construction area,Jinxian County and the middle part of Nanchang County.Cultivated land is still the largest one of all land use types,and it is all over the counties.Woodland and grassland are mainly concentrated in the northwest top of Anyi County,the middle of Wanli District and Xinjian District,and the southeast of Jinxian County.(2)The driving force of land use change in Nanchang is analyzed.Firstly,the driving factors of land use change in Nanchang from 2000 to 2017 are determined by qualitative method as population factor,economic factor,policy factor and industrialization and urbanization factor.Then,by principal component analysis,the driving factors of land use change in Nanchang are 18 social and economic indicators,such as the total population and the city's GDP.Two principal components are extracted,mainly economic development and industrial structure factors,population and agricultural technology development factors.The regression equation of construction land obtained through stepwise regression analysis shows that the construction land area increases with the increase of non-agricultural population and socially employed population,indicating that population is the main driving force of land use change in Nanchang.