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作 者 ：陈宝瑞;朱玉霞;张宏斌;周磊;辛晓平;

期 刊 ：武汉植物学研究 2008年 26卷 5期 页码：475-481

关键词：呼伦贝尔；环境因素；草甸草原；群落特征；群系；

Keywords:Hulunber, Environmental factors, Meadow grassland, Community characteristics, Association,

摘 要 ：在群落样方调查的基础上,研究了物种组成,采用TWINSPAN、DCA、DCCA对呼伦贝尔草甸草原植被进行了数量分类和排序。96个物种分属25科66属,物种丰富度在20.1种/m2。菊科(13种)、禾本科(11种)、豆科(10种)、百合科(8种)、蔷薇科(8种)等科所含物种数最多,分别占到13.4%、11.3%、10.3%、8.2%、8.2%。生活型以多年生草本占绝大多数。TWINSPAN将96个样方划分为13组,根据植被分类原则确定为13个群丛,并对群落学特征给予说明。96个样方的DCA排序结果反映了植物群落类型与环境梯度之间的关系,影响群丛分布格局的主导生态因子为坡位、土壤养分、土壤水分和pH值。优势种的DCA排序图与样方的DCA排序图有很大的相似性。排序结果与分类结果相吻合,反映出植物群落类型和物种分布随环境因子梯度变化的趋势。

Abstract:Numerical characteristics such as species composition and its relationship with environment are studied based on field survey and TWINSPAN and CANOCO software.The dominant families are Compositae,Gramineae,Leguminosae,Liliaceae,and Rosaceae,which representing 13.4%,11.3%,10.3% and 8.2%,8.2%,respectively,of the collected 96 species from 66 genera and 25 families,and perennial herbages are most abundant.Communities including 96 samples are divided into 13 groups by TWINSPAN according to the community characteristics.The result indicated that spatial pattern of the associations were mainly affected by sample position,soil nutrition,soil water and pH.DCA analysis shows that the ordination diagram of dominant species was similar to that of the samples,and ordination results couple well with classification outputs,which implicate that variation of community and species distribution are determined by change of environmental factors.

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