小五台山亚高山草甸生物多样性的空间格局

在野外考察获取第一手资料的基础上，主要采用Shannon-Weaver指数和Sφrensen指数对小五台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和研究。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2700m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。2）不同坡向条件下群落的α多样性表现为东坡＞西坡＞南坡＞北坡；而Sφrensen指数分析表明，当坡向变化时，β多样性较高。3）山坡中部特别是中下部具有较高的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。

The Spatial Pattern of Biodiversity in Subalpine Meadow on Mt. Xiaowutai

Based on the data from field survey in subalpine meadow on Mt. Xiaowutai, Hebei Province, α diversity and β diversity of the meadow were analyzed through Shannon-Weaver index and S?rensen index analysis in this paper. The results are as follows: 1) Both diversity indexes change obviously with elevation, and α diversity and β diversity change dramatically at the elevations of around 2300 m and 2700 m. 2) The order of α diversity index, from high to low, is Eastern > Western > Southern > Northern. β diversity reflected by S?rensen index increases when slope exposure changes. 3) Higher α diversity, but lower β diversity is observed on the mid-slope or the mid-bottom slope. The value of β diversity depends mostly on the range of elevation, normally between 2300 m and 2750 m, the β value reaches the highest.