---

作 者 ：郑敬刚,董东平,赵登海,何明珠,李新荣

期 刊 ：生态学报 2008年 28卷 9期 页码：4559~4567

关键词：植被群落；土壤水分；主成分排序；贺兰山；

Keywords:vegetation community, soil water, principal component analysis, Helan Mountain,

摘 要 ：通过SPSS聚类分析和CANOCO排序研究了贺兰山西坡植被分布与环境因子的关系，结果表明：在海拔梯度上，贺兰山西坡植被大致可以划分珍珠猪毛菜（Salsola passerina）-红砂（Reaumuria soongorica）群落、短花针茅（Stipa breviflora）-大针茅（Stipa grandis）群落和蒙古扁桃（Prunus mongolica ）-灰榆（Ulmus glaucescens）群落3种类型。从典范对应分析（CCA）排序结果来看，不同植被群落与环境因子的关系存在明显的分异。在珍珠猪毛菜-红砂群落，第一排序轴反映了土壤盐碱化梯度，沿着藏锦鸡儿群落—珍珠猪毛菜、猫头刺群落—珍珠猪毛菜、红砂群落序列，土壤盐碱化程度不断增强；第二排序轴则反映了土壤结构梯度，沿着藏锦鸡儿群落—珍珠猪毛菜、红砂群落—珍珠猪毛菜、猫头刺群落序列，土壤质地逐渐粗化；在短花针茅-大针茅群落，第一排序轴反映了土壤水分梯度，第二排序轴反映了海拔梯度上的水热组合梯度；在蒙古扁桃-灰榆群落，第一排序轴反映了土壤pH梯度，沿着灰榆、蒙古扁桃群落—蒙古扁桃、金露梅群落—蒙古扁桃群落序列，土壤pH值逐渐下降；第二排序轴主要反映了土壤结构梯度，沿着蒙古扁桃群落—灰榆、蒙古扁桃群落—蒙古扁桃、金露梅群落序列，土壤中粉粒、粘粒含量逐渐增加，土壤质地呈细化趋势。

Abstract:SPSS cluster analysis and CANOCO ordination method were applied to discuss the relationship between vegetation and its environmental factors in the west slope of Helan Mountain. The results show that the vegetation community can be divided into three types, namely Salsola passerina -Reaumuria soongorica community, Stipa breviflora - Stipa grandis community and Prunus mongolica-Ulmus glaucescens community. Canonical correspondence analysis suggests a significant difference on the relationship between vegetation and environmental factors. In Salsola passerina -Reaumuria soongorica community, the first ordination axes explains the salinization gradient, along the order of Caragana tibetica community，Salsola passerina-Oxytropis aciphylla community，and Reaumuria soongorica-Salsola passerine community，soil alkalization increases. The second ordination axis explains soil structure gradient, along the order of Caragana tibetica community, Reaumuria soongorica-Salsola passerina community and Salsola passerina community, soil texture becomes coarser. In the Stipa breviflora-Stipa grandis community, the first ordination axis indicates the soil water gradient, and the second ordination axes explains hydrothermal coupling gradient. In the Prunus mongolica-Ulmus glaucescens community, the first ordination axis explains the soil pH gradient, along the order of Ulmus glaucescens-Prunus mongolica community, Prunus mongolica-Potentilla fruticosa community, and Potentilla fruticosa-Prunus mongolica community, soil pH value reduces. The second ordination axis explains soil structure gradient, along the order Prunus mongolica-Ulmus glaucescens community, and Prunus mongolica-Potentilla fruticosa community, the contents of silt and clay increase, and soil texture suggests a fine trend.

---