Study On Land Use Change And Ecological Environment Effect Of Linzi District Based On Remote Sensing And GIS

Land plays a vital role in the life activities of living things,and is one of the important natural conditions for human survival.With the rapid growth of the current social population and the rapid development of the economy,the impact of human activities on the natural environment and The change in intensity continues to increase,and the change in the type of land use/cover is one of the important visual manifestations of human transformation.Studying the changes in land use is of great significance for more rational optimization of the natural conditions of human survival and the sustainable development of the ecological environment.As a municipality with a strong industrial city,Linyi District has developed industries and abundant natural resources.In the process of industrial expansion,the change of land use type and the unreasonable traditional farming have led to the problem of land ecological environment.If the land ecological security problem cannot be solved reasonably,it will not only bring losses to the social economy,but also adversely affect regional agricultural production and the ecological environment.To this end,this study is based on remote sensing image data from three different periods in Linyi District in 2008,2012 and 2018,using land information applications such as ArcGis,Erdas,ENVI,etc.for the 10-year period in Linyi District during 2008-1018/ The calculation and analysis of cover change,landscape evolution,and ecological environment effects are as follows:(1)The main land use/cover types in Linyi District during the 10 years from 2008 to 2018 are cultivated land and construction land.During this period,the area of grassland and construction land increased,and the area of cultivated land,woodland,waters and other land used decreased.Moreover,the area of cultivated land reduction is the largest,and the area of construction land is increased the most.(2)From 2008 to 2012,the increased area of grassland came from cultivated land,forest land,water area and other land,most of which came from cultivated land;the increased area of construction land came from cultivated land,forest land and other land,most of which came from cultivated land.From 2012 to 2018,the increased area of grassland came from arable land and woodland,more from woodland;the increased area of construction land came from arable land,woodland,water and other land,most of which came from arable land.(3)From 2008 to 2012,the increased area of grassland comes from cultivated land,forest land,waters and other land,mainly from cultivated land;the increased area of construction land comes from cultivated land,forest land and other land,mainly from cultivated land.From 2012 to 2018,the increased area of grassland comes from cultivated land and forest land,and more from forest land;the increased area of construction land comes from cultivated land,woodland,waters and other land,most of which comes from cultivated land.(4)In the evolution of landscape type pattern in Linyi District from 2008 to 2018,the patch shape complexity and landscape fragmentation of construction land increased,and the shape complexity and landscape fragmentation of other five types of grassland and cultivated land decreased.The degree of landscape separation with construction land is reduced,and the landscape separation of forest land,cultivated land,waters and other land uses increases.At the same time,from the analysis of the overall level of landscape,the land use/cover change in Linyi District from 2008 to 2018 caused the fragmentation of the landscape pattern to increase.(5)Among the land use/cover types in Linyi District from 2008 to 2018,the cultivated land and waters are of high ecological sensitivity type,the forest land is moderately sensitive,the grassland is low sensitivity,and the construction land and other land use are not sensitive.In the past ten years,the ecological environment quality index of Linyi District has been declining year by year,indicating that the changes in the land use/cover type during the 10-year period have had a negative impact on the overall ecological environment quality of Linyi District.(6)The driving factors for the change of land use/cover type affecting the ecological environment quality in Linyi District are different in different time periods: in 2008-2012,the conversion of cultivated land to construction land is the main factor for the deterioration of ecological environment quality,and the cultivated land is converted into Grassland is the main factor for improving the quality of ecological environment.In 2012-2018,the conversion of grassland to construction land is the main factor for the deterioration of ecological environment quality.The conversion of construction land to cultivated land is the main factor for improving the quality of ecological environment.(7)Changes in land use/cover types during the period 2008-2018 led to an increase in the area of high-risk,relative high-risk and relative low-risk areas in Linyi District,while the area of medium-and low-risk areas continued to decrease.