高黎贡山中山湿性常绿阔叶林树种的种间联结性研究

Interspecific Associations of the Tree Species in the Mid-montane Humid Ever-green Broad-leaved Forest in the Gaoligong Mountains

以高黎贡山中山湿性常绿阔叶林为研究对象,分析中山湿性常绿阔叶树种的总体相关性、种内种间关系,种间联结性与群落发展变化的关系,探讨负密度制约效应对种间关系的影响。结果表明:树种总体相关性表现为显著的正联结关系,说明样地群落各树种和谐共存;样地多数种对(70%以上)的种间关系相互独立,部分种对有联结关系(正或负),但联结程度较弱(其中近半数种对联结系数在-0.6~0.6),印证了群落中多数树种在资源利用上没有明显冲突,相互间依赖性较弱或在生境需求方面竞争较弱,利于形成较稳定的种群和群落结构;样地多数树种的种内联结性在幼树与中树间表现为正联结关系,在幼树与大树间相互独立,可能是负密度制约效应引起的;取样样方大小对种间联结关系及联结程度存在一定影响,取样样方减小时,样地中具有联结关系(正或负)的种对所占比例增加,具负联结关系的种对其联结程度增强,具正联结关系的种对其联结程度减弱。

Based on the data collected from sample plot of 4 hm2’for analysing the relations between interspecific association and community succession’and discussing the effects of the negative density-dependent mechanism on the interspecific association’the overall associations and intra-and interspecific associations among tree species in the mid-montane humid evergreen broad-leaved forest in the Gaoligong Mountains in Yunnan Province were studied.The results showed that the overall associations of tree species in the plot showed significant positive’which suggesting that most of species can be in harmony in the community’and the community was in a relatively stable stage of succession.Most of species combinations among all the species’the dominant species and the species within the same family showed a independent associations’further indicated that most of species in the community had no apparent conflict in the utilization of resources’and their interdependence or intercompetition for the habitat requirements was weaker,more helpful to promote the development of their stability in the community.Intraspecific associations o!most o!species showed positive between the saplings and the medium trees,but independent between the saplings and the adults,which may be caused by the negative density-dependent effect.