雪山雪東線之不同海拔梯度的物種及生活型多樣性

摘要

This study compiled 44 plots (each 10 � 25 m^2) and recorded 383 species of vascular plant along the eastern trail of Mt. Shei from 1,682 m to 3,886 m. Overstory species richness and abundance generally increased along the altitudinal gradient until the peak appeared between 2,000 and 2,500 m and then declined along the altitudinal gradient. Understory species richness and abundance increased slightly at an altitude of 3,000 to 3,500 m. Overstory and understory evenness indices showed no obvious trends. Jaccard and S�renson similarity indices decreased with an increase in the altitudinal gradient, This may be caused by environment factors and a decrease in spatial heterogeneity. Along the altitudinal distribution of sample plots, life form abundance clearly decreased. The vegetation distribution showed that the vegetation subtypes differed with the structure and composition of life forms. The structure of plant life-forms in the area may be based on plant survival strategies determined by their habitat.