黄土高原马栏林区植物群落的多元分析与环境解释

Multivariate Analysis and Environmental Interpretation of the Florae in Malan Forest Region of the Loess Plateau

应用双向指示种分析(TW IN SPAN)及除趋势对应分析(DCA)对黄土高原马栏林区40个植物群落样地资料进行了多元分析——数量分类和排序,并结合群落排序值与环境参数的回归分析给出各群落类型的定量环境解释,探讨了该区植物群落的基本类型、生态梯度及其与环境因子的定量关系.结果表明:在大尺度范围内,决定马栏林区植物群落宏观分布格局的主导因子是坡向和坡位;小尺度范围内,决定该区植物群落类型和分布的主导因子是枯枝落叶层厚度、土壤腐殖质厚度、土壤全磷、速效磷含量及土壤的pH值.

The paper adopts TWINSPAN and DCA to conduct the multivariate analysis of the quadrat data of forty florae in Malan forest region of the Loess Plateau quantitatively classify and collate the florae, and presents the quantitative environmental interpretations of different flora types in combination with the correlation analysis of the quantitative ordination and environmental parameters of the florae,and probes basic types and ecological gradients of the florae and their relations to environmental factors in the forest region. The results show that on a large scale,the dominating factors that the macro-distribution of the florae in Malan forest region depends on are slope aspect and position, but on a small scale, the dominating factors that the macro-distribution of the florae in Malan forest region depends on are litter thickness,soil humus thickness,total soil phosphorous,available soil phosphorous content and soil pH.