Analysis On The Change Of Landscape Patterns Of Mibu Land Use In Different Purple Hilly Area

Geomorphology can be classified into mountains, hills, plateaus, plains and basins in geological theories.Different geomorphic type has significantly different rules in satellite images and interpretation of aerial images;meanwhile, the change law of landscape patterns in land use are not the same.Therefore, to study the change rule of certain geomorphic types is inevitable to combe high-resolution remote sensing images.Hilly region is typical geomorphic type in Sichuan basin,and mibu land use(Production land, Living land, Ecological land) is one of the central and hotpot study field in landscape ecology.To study the law of landscape patterns in mibu land use is not only integrated the trend of ecological field,but also enriched the basic theories of mibu land use.With the support of ENVI4.8,Arcgis9.3 and Fragstats3.3 softwares, The paper has regarded the three types of land use as research object in the typical hilly region and based on aerial image data,then made analysis on variation of three types of land use change and landscape pattern structure in diverse hilly areas. The main results are as follows:(1)Studying on extracted information from different kinds of hilly land aerial images showed that different hilly region hah different segmentation and merging scale,and the land use information showed the same trend with a mere distinct.When merging scale changed in 75-90,segmentation scale range mainly was between 20-40.(2) Analyzing the characteristic of three types land use structure in different hilly area has shown as follows:productive ldnd area decreased, with the rise of height terrain,however,ecological land area increased and living space area basically remained steady.The ratio of land use feature in different hill areas as follows:in the areas of shallow hill and platform area,the ratio of land use feature is 5:3:2 in productive areas,living areas geological areas,respectively. In middle hill and median valley area and deep hill and strid area,,the ratio of land use feature are 3:3:4 and 3:3:5,respectively.(3) The features of patch types showed that though the same hill experienced a different change,the different hill showed the same trend of landscape patterns in mibu land use.There were a variable increase and decline,in contrast,the different hills in mibu land use showed a regular trend. The results showed that despite of the opposite changes in middle hill and median valley area and deep hill and strid area, the landscape index of perimeter-area fractal dimension show the same trend in different hill areas.Analyzing the features of landscape showed that with the rise of topography fluctuation,the diversity indices,eveness indices distribution and juxtaposition indices decreased showing the same trend.The value of CONTAG increased with the growth of topography fluctuation,indicating high hill areas have great influence on human disturbance.