The diversity, richness and evenness of tree layer and bush layer descended when altitude rose, however, the diversity and evenness of grasses rose from 1 700 m to 1 900 m with rise of altitude, and the richness rose from 1 900 m to 2 700 m.

• (2 )群落不同层次表现为 :乔木层和灌木层多样性、丰富度和均匀度随海拔升高而下降 ,草本多样性和均匀度表现为上升趋势 ,丰富度下降到 190 0m后开始上升 ;