山西北部地区沙棘群落的数量分类和排序研究

采用双向指示种分析法对山西北部地区沙棘群落进行分类和排序研究，结果将山西北部地区沙棘群落划分为14个群系，并论述了各群系的特征。DCA排序进一步说明了群系的分布格局与水分和土壤的密切关系，结果表明组成沙棘灌丛的种群对群落生境具有指示作用，能客观反映群落的生境特征．

Study on classification and ordination of Hippophae rhamnoides subsp.sinensis community in the north of Shanxi

The classification and ordination of Hippophae rhamnoides subsp.sinensis community in the north Shanxi were studied using two-way indicator species analysis (TWINSPAN) and detrended correspondence analysis(DCA).Thirty-there samples collected from the north Shanxi were classified into 14 associations by TWINSPAN.The community characteristics of every association were described.The result of DCA ordination indicated that there were obvious relationship between the distribution pattern of associations and soil water content,soil texture.Furthermore,the analysis of DCA proved the continuous change of association and environmental variation.DCA ordination of species showed that species acted as indicator for habitat factors and was impersonally reflected characteristics of biotope.