西双版纳热带季节雨林林冠种群种内、种间竞争的初步研究

利用Hegyi的竞争指数模型,分析了西双版纳热带季节雨林的主要类型绒毛番龙眼群落中林冠种群种内和种间的竞争强度及种群和个体在群落中的竞争干扰状态.结果表明,季节雨林中林冠种群的种间竞争大于种内竞争,每个林冠种群一般与多个其它林冠种群发生竞争.多数种群既被竞争种干扰,又干扰竞争种.个体在群落中所处的层次越高,受到的竞争干扰越小,下层中的个体多数处于受压迫状态.群落中没有完全的竞争优胜者.只有成年个体处于竞争优势地位,幼苗、幼树又能在受压迫中生存的种群,才能在群落中保持长期存在.

A preliminary study on the intraspecific and interspecific competitions of canopy populations in tropical rain forest in Xishuanbanna.

With Hegyi's competition index model, the intraspecific and interspecific competitive intensity and the population and individual competitive disturbance of canopy populations in Pometia tomentosa community, one of the tropical seasonal rain forests in Xishuangbanna, were analyzed. The interspecific competition is more intensive than the intraspecific competition. A canopy population competes with many of other canopy populations. Most tree populations in canopy layer are interfered by and with other populations. The competition intensity of individuals decreases with increasing height of objective trees. Most individuals in lower layers are suppressed. None of tree populations is superior in competition. The mature individuals are only superior in competition. The populations whose seedlings and juveniles are alive under the suppressed condition may maintain their stability in the community over a long period of time.