<正>在罗卜岩自然保护区中调查以闽楠、光皮桦和台湾冬青为优势的常绿落叶阔叶混交林１０个样地，运用生态位重叠计量公式计算ＬｏｔｋａＶｏｌｔｅｒａ竞争系数，比较竞争系数与Ｋ值比，其中Ｋ值由Ｌｏｇｉｓｔｉｃ种群增长模型估算。结果表明，在调查群落中，耐阴的顶极树种闽楠和台湾冬青种群在竞争平衡时将取代喜光的先锋树种光皮桦种群。现存林分中闽楠种群密度虽然较台湾冬青为大，但随着种间竞争的进行，台湾冬青将不断扩大种群密度，达到与闽楠种群共存的竞争结果，而此竞争结果与各树种的生态学特性如对光照适应等密切相关。

This paper deals with competition among three species (Phoebe bournei,Betula luminifera and Ilex formosana) in Luoboyan Nature Reserve of Fujian province. The relative densities of these species are taken as the measurement of niche overlap and their competitions are analysed by comparing K ratios with competition coefficients with the results that Betula luminifera will be replaced by increasing Phoebe bournei and Ilex formosana populations. Ilex formosana population can coexist with Phoebe bournei population while present density of Phoebe bournei population is larger than that of Ilex formosana population. The results show that LotkaVolterra competition equation together with K of the Logistic model is practical to predict population dynamics in this research. The process of competition is closely related to ecological characteristics of these different populations.