山西五台山蓝花棘豆群落的数量分类和排序

应用双向指示种分析法(TWINSPAN)和除趋势对应分析法(DCA)对山西五台山蓝花棘豆群落Oxytropis coerulea (Pall.) DC.]进行了分类和排序.TWINSPAN分类结果将26个样方划分为8个群丛,即,蓝花棘豆 披针叶苔草 垂穗鹅观草群丛、蓝花棘豆 披针叶苔草群丛、蓝花棘豆 披针叶苔草 地榆群丛、蓝花棘豆群丛、蓝花棘豆 披针叶苔草 莓叶委陵菜群丛、蓝花棘豆 无芒雀麦群丛、蓝花棘豆 地榆群丛、蓝花棘豆 山蒿群丛,并分别对每个群丛生境进行了论述. DCA二维排序图较好地验证了TWINSPAN的分类结果,其纵、横坐标均反映了群丛所在环境的海拔等生态因子的梯度变化.种的DCA排序结果表明,群落中的建群种对海拔等生态因子有明显的指示作用,随海拔升高群落中的建群种由喜温耐旱植物演变为喜湿耐寒植物.

The numerical classification and ordination of Oxytropis coerulea community of Wutai Mountain in Shanxi Province

The classification and ordination of Oxytropis coerulea (Pall.) DC. community of Wutai Mountain in Shanxi Province were studied using the two-way indicator species analysis (TWINSPAN) and the distended correspondence analysis (DCA). Twenty-six quadrats selected from the O. coerulea community were classified into eight associations by TWINSPAN,that is, Assoc. O. coerulea (Pall.) DC.+ Carex lanceolata Boott.+ Roegneria nutans (Keng) Keng,Assoc. O. coerulea +C. lanceolata, Assoc. O. coerulea +C. lanceolata + Sanguisorba officinallis L.,Assoc. O. coerulea,Assoc. O. coerulea + C. lanceolata + Potentilla fragarioides L.,Assoc. O. coerulea + Bromus inermis Leyss.,Assoc. O. coerulea +S. officinallis,Assoc. O. coerulea + Artemisia brachyloba Franch. The result of DCA ordination tested and verified the result of TWINSPAN, the ordinate and abscissa of DCA ordination indicate the gradient varity of altitude of every associations. Furthermore, DCA ordination of 65 species shows that the edificato in the community possesses the indication to the ecological factors, with the altitude increasing, the edificato changes from the hyperthermophilic and arido-tolerant species to the hygrophilic and frigophilic species.