Abstract: Based on the investigation along the transect of 10 m?1 200 m in the Dinghu Moutain,which started from 50.2 m to 476.5 m above sea level,the vertical pattern of plant community and their biodiversity were studied.There were 3 forest types and 5 communities along the transect,which consisted of a succession series.But vertical distribution was not in order.In the tree layer,the biodiversity index was in order of broad-leaved forest of mesophytes > pine and broad-leaved mixed forest > broad-leaved forest of heliophytes;In the herb layer,The biodivecsiey index was in order of pine and broad-leaved mixed forest > broad-leaved forest.Most herb groups of heliophytes grew in pine and broad-leaved mixed forest and broad-leaved forest of heliophytes.The distribution of herb groups was complex under tree canopy,and some herb groups of shade-tolerance species grew under heliophytes groups,which indicated that micro-environment under tree-crown could influence the pattern of herb group distribution obviously.

Key words: Artemisia frigida, Grazing-induced retrogression, Biomass, Resource allocation