海南岛桉树林林下植物多样性与环境因子相关性初探

根据野外样方样地调查数据,通过单因子相关分析,探讨了海南岛桉树林林下植物多样性与年降水量、土壤含水量及土壤速效养分N、P、K含量的相关性。结果表明,林下木本植物的多样性指数H′、D与年降水量、土壤含水量、土壤速效N及有效P含量显著或极显著相关,但草本植物的多样性指数H′、D与这些因子均无显著相关关系。此种差异,可能是桉树林内灌木发育良好,限制了林下草本的生长所造成的,或是桉树林林下植被演替所处阶段使然。

Analysis of the Relationship Between Undergrowth Diversity in Hainan Eucalyptus Plantation and Its Relative Factors

This paper intended to find critical factors which influence diversity of Eucalyptus understorey vegetation on the basis of comparative analysis of annual rainfall,soil water content and soil available N, P,K by the method of outdoor's sample plot surveying in Hainan Island.The result of single factorial correlation analysis shows the Diversity index H'and D of woody plants have significant correlation with soil moisture,annual rainfall,available N and P of soil,but none of these factors has significant correlationship with the diversity index H'and D of herbaceous plants.This difference can be explained by the fact that understorey shrub's development limited herb's growth;or by the stage of understorey vegetation succession in Eucalyptus forest.