广西不同林龄马尾松人工林林下木本植物种间联结动态

Interspecific Association Dynamics of Understory Woody Plants with Different Forest Ages of Pinus massoniana Plantation in Guangxi

关键词:  种间联结  种间相关性  优势种  林下植被  马尾松人工林

Key words:  interspecific association  interspecific correlation  dominant species  understory vegetation  Pinus massoniana plantations

摘要:

为了解广西不同林龄马尾松(Pinus massoniana)人工林林下主要木本植物间相互作用的变化规律，以空间代替时间的方法，在群落调查的基础上采用多物种间的总体关联显著性检验、x²统计量分析和Spearman秩相关检验对广西不同林龄马尾松人工林亚乔木层和灌木层木本植物种群进行种间联结分析。结果表明：(1)不同林龄阶段亚乔木层物种间的总体关联性均呈不显著正联结,从中林龄到成熟林再到过熟林，灌木层物种间的总体关联性变化趋势为不显著负联结→不显著正联结→不显著正联结；(2)随着林龄的增长，林下主要木本植物正联结种对比例增加，种间关系逐渐趋于正联结，群落稳定性逐渐增加，向顶级群落方向演替；(3)马尾松人工林林下主要木本植物中大多数种对间的相关性并不显著，物种间的关系较为松散，种对间的关联性较弱，所研究的马尾松人工林仍处于不稳定的演替阶段。充分利用种间关系研究的结果对马尾松人工林群落进行科学维护，可以加速马尾松人工林群落的恢复。

Abstract:

In order to understand the variation of the interaction among the main woody plants in Pinus massoniana plantations of different ages in Guangxi,the method of space instead of time was used to analyze the interspecific association of woody plant populations in sub-tree layer and shrub layer of P.massoniana plantations of different ages in Guangxi by using the overall association significance test,x² statistics analysis and Spearman's rank correlation test on the basis of community investigation.The results showed that: (1) the overall association among species in sub-tree layer at different forest age stages showed no significant positive association.From middle forest age to mature forest and then to over-mature forest,the change trend of the overall association among species in shrub layer showed non-significant negative association→non-significant positive association→non-significant positive association.(2) With the increase of forest age,the proportion of positive association species pairs of main woody plants under the forest increased,the interspecific relationship gradually tended to be positive association,the community stability gradually increased,and the community succeeds to the top community.(3) The correlation between most species pairs in the main woody plants of P.massoniana plantation was not significant.The relationship between species was relatively loose,and the correlation between species pairs was weak.And the studied P.massoniana plantation was still in unstable succession stage.Making full use of the results of interspecific relationship research to maintain the P.massoniana plantation community scientifically can accelerate the recovery of P.massoniana plantation community.