山西关帝山神尾沟植物群落物种多样性与环境关系的研究I．丰富度、均匀度和物种多样性指数

以89个植物群落调查样地数据为基础，运用8个多样性指数对山西关帝山神尾沟物种多样性与环境之间的关系进行了分析.（1）群落总的表现为多样性和均匀度随海拔升高而下降，丰富度从1700m下降到2400m后开始升高；（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1900m后开始上升；（3）乔灌草三者多样性和丰富度指数值以及变化幅度都表现为草本层>灌木层>乔木层，三者均匀度相差不大；（4）群落不同坡向表现为阳坡多样性和丰富度都大于阴坡，均匀度相差不大.图6参7

PLANT SPECIES DIVERSITY OF SHENWEIGOU IN GUANDI MOUNTAINS (SHANXI, CHINA) I. RICHNESS， EVENNESS AND DIVERSITY INDEXES

Based on the data form 89 plots, the plant species diversity in Shenweigou in the Guandi Mountains, Shanxi were studied by using 8 diversity indices. The results indicated: (1) The diversity and evenness declined, and the richness descended from 1 700 to 2 400 m, but rose from 2 400 to 2 700 m when the altitude rose. (2) 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. (3) The diversity and the richness of grasses layer>that of bush layer>that of trees layer, and there was no significant difference in the evenness among them. (4) The diversity and richness on sunny slopes>that on shadow slope, and there was no significant difference in evenness indices. Fig 6, Ref 7