干旱区生态环境知识资源中心

Located in the east and the middle section of Qilian Mountain respectively, the upstream basins of Shivang River and Heihe River are the main body of forest landscape ecosystem of Qilian Mountain. The Landscape patterns of these two districts were compared using TM image and DTM, under the help of Geograpluc Information System. The basic landscape type maps are complied based on the land use maps interpreted from TM images in two research districts in 2000. The correlative landscape indices are calculated to compared fragmentation. connectivity, diversity and heterogeneity of the two districts by using the landscape structure analysis software - FRAGSTATS. The spatial distribution features of all the landscape types in the two districts are analyzed and compared by superposing the maps of DEM. slope gradient and aspect with the maps of landscape types. The results shows that the main difference of the landscape patterns in the two study districts is the proportion of farmland area. this is also the main reason responsible for the difference in the other features of landscape pattern. The upper Sluvang basin have smaller patches but are more uniformly distributed. and the fragmentation degree of the landscape entirety and grassland is higher than that of the upper Heihe basin. which caused by the disturbance of land reclamation. The proportion of farmlands and grasslands are also influence the spatial distribution features of the landscape types at different terrain conditions. The results well demonstrate the relationship of human activities and the and mountain ecosystem structure.