甘肃马衔山林区植被的数量分类与排序

 本文用目前各国学者广泛使用的一些数量分类和排序方法对黄土高原区的马衔山植物群落进行了分类和排序。所用方法包括多元等级分划分类(TWINSPAN程序)、PCA排序(ORDINA程序)、RA和DCA排序(DECORANA程序)。研究结果表明可以把32个样地分为两大类共7个群落类型：山地森林 (1)山杨+白桦群落，(2)青杆群落，(3)青杆+白桦+山杨群落，(4)山杨+康定柳+糙皮桦群落；山地灌丛 (1)康定柳+糙皮桦群落，(2)糙皮桦+黄毛杜鹃+裂香杜鹃群落，(3)黄毛杜鹃+裂香杜鹃群落。它们的分布格局与海拔梯度密切相关。此外，本文还对所用方法的比较进行了讨论。

QUANTITATIVE CLASSIFICATION AND ORDINATIO OF VEGETATION IN MAXIAN MOINTAIN FOREST REGLON

The plant communities in the Maxian Mountain Forest Region were classified and ordinated using Two-way Indicator Species Analysis (TWINSPAN), PCA (Prinicipal Components Analysis), RA(Reciprocal Averaging) and DCA (Detrended Correspondence Analysis). Thirty-two plant community samples are classified into seven formations and two vegetation types of higher class. The classification results are: Ⅰ. Hill forest: (1)Form. Populus davidiana + Betula platyphylla (2) Form. Picea wilsonii (3) Form. Picea wilsonii+ Betula platyphylla + Populus davidiana (4) Form. Populus davidiana + Salix paralesis + Betula utilis, Ⅱ. Hill shrub: (1) Form. Salix paraplesis +Betula utilis (2) Form. Betula utilis +Rhododendron rufum+ Rhododendron anthopogonoides (3) Form. Rhododendron rufum+Rhododendron anthopogonoides. The first axis of DCA ordination reflected elevation gradient. The second axis was shade gradient. The methods used in this paper were compared and discussed.