根据西鄂尔多斯地区半日花群落的70个样方调查数据,利用TWINSPAN数量分类和DCA、CCA排序方法对半日花群落进行分析,结果表明:半日花群落可分为2个群丛组8个群丛类型,其中以半日花为建群种的半日花—蓍状亚菊群丛和半日花—刺叶柄棘豆群丛为主要群丛类型,以半日花为次优势种的群丛类型有3个.DCA、CCA 排序结果与分类结果基本一致.半日花群丛的分布与坡度、坡向、土壤水分密切相关,随水分条件的降低半灌木成分在群落中的作用下降,其他小灌木在群落中的作用增强.半日花群落表现出一定的复杂性和生境的破碎性.%Hellanthemum soongoricum is a tertiary relic plant and now is regarded as rare and endangered plant.In this study,in order to understand the community types of Hellanthemum soongoricum in west Ordos,a field investigation was conducted at 70 sampling plots,and the quantitative classification and ordination on the community types were made by the methods of TWINSPAN,DCA and CCA.The results showed that Hellanthemum soongoricum community was classified into 2 association groups and 5 associations,in which Association Hellanthemum soongoricum-Ajania achilleoides and Association Hellanthemum soongoricum-Oxytropis aciphylla were the major association types.In addition,there were 3 association types that Hellanthemum soongoricum was the dominant species of subdominant synusias.DCA and CCA ordination also showed the same results that the distribution of Hellanthemum soongoricum associations correlated with slop,slop aspect and soil moisture closely.With the decrease of soil moisture,the function of subshrub in community decreased but that of undershrub increased.The study indicated that Hellanthemum soongoricum showed a certain complexity and fragmentation of habitat.
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