芦芽山亚高山草甸的数量分类与排序研究

芦芽山亚高山草甸是在华北地区最典型的山地草甸之一，该草甸在水土保持、生态旅游资源开发和生物多样性保护等方面发挥着重要作用。应用双向指示种分析法（TWINSPAN）和除趋势对应分析（DCA）相结合的方法，对山西芦芽山亚高山草甸进行数越分类和排序，将该草甸划分为13个群丛类型，分别位于不同的海拔高度。分类结果很好地反映了植物群丛类型与环境梯度之间的关系，并在DCA二维排序图上得到较好的验证。DCA排序轴反映了海拔、土壤湿度和坡向的梯度变化，表明海拔高度、水热条件和地形是影响植物群丛变化的主要生态因子。

Quantitative Classification and Ordination of the Subalpine Meadows in Luyashan Mountain

The subalpine meadows in Luyashan Mountain are one of the typical meadows in north China and play an important role in water and soil conservation, eco-tourism resource exploitation and bio-diversity protection and so on. The meadows in west Luyashan Mountain were classified and ranked by TWINSPAN and DCA into 13 associations that were located at different altitudes above sea level. The results of the classification and ordination better reflected the relationship of plant associations with environmental gradients that was verified in the two dimension ordination diagram by DCA. The axes of the ordination by DCA displayed the gradient changes of the altitude above sea level, soil moisture and slope aspects as well as that the altitude above sea level, water and thermal conditions and landforms are the major ecological factors to exert influence on plant associations.