Abstract: Due to its unique topography, the mountainous and hilly transition zone has a complex but regular landscape pattern. The analysis of terrain factors can not only make a reasonable explanation for the landscape pattern of complex geographical units, but also help further understand the distribution law of landscape pattern, laying a foundation for optimizing spatial allocation. Mainly based on Google Earth image, DEM and 30 m global surface coverage data in 2017 as data sources, applying methods of GIS technology, distribution index, landscape pattern index and moving window, this paper analyzes the spatial distribution characteristics of landscape types in the middle and upper reaches of Fujiang River Basin with the changes of elevation, slope, fluctuation and slope direction, the spatial difference of landscape pattern with the moving window method as well as exploring the influence degree of different terrain factors on landscape pattern change with Pearson correlation analysis method. The results show that: (1) With the increase of elevation, slope and fluctuation, the landscape type changes from man-made culticated and construction land to nature-driven grass and forest land; it is with the most obvious advantage and disadvantage changes of the construction land from sunny slope. (2) The most abundant landscape type in the basin is the impact plain, which is mainly distributed in the areas with altitude (>500-650 m), slope (0-5°) and fluctuation (>10-30 m); while the landscape pattern tends to be single and the fragmentation degree is weak in the areas with high altitude, slope and fluctuation. (3) The diversified landscape in mountainous areas is mainly distributed along the Fujiang River, while the landscape in hilly areas tends to be unitary along the Fujiang River. The landscape in the impact plain areas tends to be relatively unitary → diversified → relatively unitary from the outside to the inside, and the landscape in the urban-rural junctions is the most abundant. (4) The influence degree of different terrain factors on landscape pattern can be expressed as: elevation > slope > fluctuation > slope direction. Elevation, slope and fluctuation have strong correlation with landscape pattern, while slope direction shows weak correlation.

Key words: transition zone from mountainous to hilly areas, topography factor, landscape pattern, middle and upper reaches of Fujiang River