中文摘要：

基于野外考察获取的第一手资料，主要采用shannon-weaver指数和sorensen指数对五台山高山、亚高山草甸植被的植物生物多样性及其空间变化格局进行了分析．主要结论如下：1）海拔高度对植物生物多样性影响非常明显，海拔2300m和2800m左右分别既是α多样性也是β多样性出现明显变化的地段，海拔2300m可能为亚高山草甸分布的下限，而海拔2800m为高山草甸分布的下限；2）不同坡向条件下群落的α多样性大小依次排列为：半阳坡、阳坡、阴坡、半阴坡；3）sorensen指数分析表明，当坡向变化时，β多样性较高；4）山坡中部特别是中上部具有较高的α多样性，而β多样性较低，坡面上β多样性的大小主要取决于坡面所处海拔高度的范围．

英文摘要：

Based on field survey data for alpine meadow on Wutai Mountain, Shanxi province, α and β meadow diversity were analyzed through shannon-weaver index and sorensen index. Data show that： 1） Both diversity indices changed markedly with elevation, α and β diversity changed dramatically at elevations 2 300 m and 2 800 m. 2 300 m a. s. 1. might be the lower limit of sub-alpine meadow, while 2 800 m a. s. 1. being the lower limit of alpine meadow. 2） The order of α diversity index, from high to low, is. semi-sunny convex slopes, sunny slopes, shady slopes, semi-shady convex slopes. 3）β diversity reflected by sorensen index increased with different slope exposures. 4） Higher a diversity, but lower β diversity is observed on mid-slope or mid-up slope. The value of β diversity depends mostly on elevation, normally between 2 300 and 2 800 m,β value was the highest.