祁连山自然保护区是我国生物多样性的热点区域，选择该保护区6个保护站具有代表性的青海云杉群落(Picea crassifolia Kom.)设置400 m2的样地16块，对群落的β多样性的垂直分布格局进行了分析。结果表明：青海云杉群落植物物种集中分布于海拔2 700~2 900 m，平均种数12.25种，2 700 m以下随海拔梯度的降低和2 900m以上随海拔梯度的增加，物种数都呈减少趋势；随海拔梯度升高相邻样地间共有种数、SΦrenson指数、Cody指数和Jaccard指数大致呈先降低后增加的趋势。沿海拔梯度升高，苔藓青海云杉林组成种类呈减少趋势，共有种数、SΦrenson指数和Jaccard指数呈先升高后降低的趋势，Cody指数呈先降低后上升的趋势；草类青海云杉林共有种数、SΦrenson指数和Jaccard指数逐渐降低，Cody指数则先降低后升高；青海云杉混交林组成种类、共有种数呈减少趋势，SΦrenson指数和Jaccard指数呈逐渐降低的趋势，Cody指数呈逐渐上升的趋势。

Qilianshan National Nature Reserve is a key area for biodiversity in China. Based on the data collected from the 16 sampling plots which 400 m2 per plot selected from representative Picea crassifolia community in six natural forest protection stations, the vertical distribution pattern β diversity were studied. The results showed that: the number of mutual species, SΦrenson index, Cody index and Jaccard index had a general trend of decrease following by increase between adjacent plots with the elevation increased. Along with the elevation gradient increased, in moss and P.crassifolia forest, the species showed a decreasing trend, mutual species,SΦrenson index and Jaccard index decreased after the first increasing trend, and Cody showed a first up after lower trend;in grasses and P.crassifolia forest, the mutual species, SΦrenson index and Jaccard index has been declining and Cody index increased after the first decreasing trend; in mixed P.crassifolia forest, species and mutual species showed a deceasing trend, SΦrenson index and Jaccard index showed a gradually decreasing trend and Cody index showed gradually increasing trend. The correlation between P.crassifolia community and elevation was not significant, the correlation between all diversity index displayed different characteristics.