关键词: 青冈, 常绿阔叶林, 群落组成与结构, 种群大小级结构, 动态

Abstract:

Dynamics of evergreen broad-leaved forests dominated by Cyclobalanopsis glauca in Zhejiang, China was studied.Species composition of the forests indicated that it was dominated by evergreen species with fairly proportion of deciduous species in all four stages.LAI of the forest tree layers was bigger in 7 years forest than that of 20 years forest, and it increased gradually after 20 years.Diversity of the individuals and amount of species of trees, subtrees, liana and herbs were highest in 7 years.Shannon - Wiener index of tree, subtree, and herb layer in four stages was respectively 3.32 ~ 4.88、3.59 ~ 4.14、1.14 ~ 2.36, and its dynamic characteristics was similar to that of the community structure and species numbers.C.glauca can germinate fast in the cutover land, it is dominant in the 7 years young forest.Because of this, the community demonstrates condensed succession to go to the phase of evergreen broad-leaved forest quickly.C.glauca population was short of seedlings and saplings and its size class structure shows as spindle shape in 40 years, the reasons for this were:the population age was young, the seed pool was destroyed by animals and microbes, sprouting of seeds and growing of seedlings needed certain conditions such as light, temperature, and humidity' etc..To fill up the vacancy of seedlings and saplings, mother ramets can grow a lot of daughter ramets and sprouted branches.In the later stages, it may be propagated by sexual and/or asexual ways according to the habitat to consolidate its dominant position. Biomass, growth-yield of tree and subtrees layers increased with the development of community.

Key words: Cyclobalanopsis glauca, Evergreen broad-leaved forest, Species composition and structure of the community, Size class structure of population, Dynamics