Taking Ciha Gorge as the research area and using GIS

the terrain factors such as altitude

slope

and aspect were extracted and overlaid with vegetation type map. Combined with indicators of diversity index(H)

evenness(E) and others

the relationships between the spatial pattern of vegetation and the terrain factors were explored. Results showed that spatial vegetation pattern had a close relationship with terrain factors. The optimal growth range for subalpine dark coniferous forest on shady slope was in 3290~3880 m altitudes and 25°~45° slope degrees; for mountain Sabina chinensis forest on sunny slope

3880~4470 m

the same slope degrees as on shady slope; and for coniferous and broad-leaved mixed forest and alpine deciduous broad-leaf forest

2700~3290 m

15°~25° on shady slope and 2995~3290 m on semi-shady slope

respectively. Alpine shrub and grassland had a relatively wide distribution in terms of slope degree and slope aspect.