Landscape Pattern Characteristics and Grain Effect of Landscape Index in Loess Hilly Region

Taking Gaojiagou Basin as study area,based on RS(Remote Sensing) technologies,the landscape map was made.In order to analyze the grain effects at the landscape level,GIS(Geographic Information System) software and landscape pattern analysis software Fragstats were used to calculate landscape pattern indices of Gaojiagou Basin.The results showed that the grassland was the dominant land use type in Gaojiagou Basin while the garden plot was small and the structures of many land use types were unreasonable with complicated patches as well as scattering distribution;grain change had great effects on landscape index calculation and different indices had different grain effects:(1) landscape indices showed a gradual downward trend with the increasing grain size;(2) landscape indices showed the unobvious trend with the increasing grain size,and it was fluctuation.The grain size which was suitable for analyzing the landscape in the study area should be 75~120 m.