化州不同林龄人工林土壤养分及林下植物功能群特征研究

Study on the Characteristics of Soil Nutrients and Understory Plant Functional Groups of Artificial Forests of Different Ages in Huazhou

该研究以桉树纯林、湿地松纯林、混交林的3种林龄阶段林分为对象,探究不同林龄林地土壤因子和林下植物丰富度及重要值,明确林下植物功能群与环境因子之间的关系。结果表明,3种类型林分土壤全氮、全钾、钾氮比与植物功能群重要值都有着显著的相关性,土壤氮元素和钾元素对林下植物群变异都发挥着重要作用。不同林分类型不同林龄人工林林下阳性、耐阴性植物功能群丰富度和重要值都存在显著差异,随着林龄或混交树种增加,耐阴性植物功能群的丰富度增加,重要值降低,群落逐渐向成熟阶段发展。

In this study,three age-stage forests of Eucalyptus pure forest,Pinus elliottii forest,and mixed forest were divided into objects to explore the soil factors of forests of different forest ages and the richness and important values of understory plants,and clarify the relationship between the function groups of understory plants and environment factors.The results showed that the soil total nitrogen,total potassium,potassium-nitrogen ratio of the three types of forest stands have significant correlations with the important values of plant functional groups.Soil and soil nitrogen and potassium play an important role in the variation of the understory flora.There are significant differences in the richness and important values of the functional groups of positive and negative-tolerant plants under different plantations of different forest types and ages.As the age of the forest or mixed tree species increases,the richness of the functional groups of negative-tolerant plants increases and the important value decreases.The community gradually developed to a mature stage.