浙江天台山常绿阔叶林不同演替阶段优势种群动态

以大小级代替年龄结构对浙江天台山常绿阔叶林次生演替系列群落优势种群密度动态和分布格局进行了研究.研究结果表明:从针叶林向常绿阔叶林演替的进程中,马尾松Pinus masonniana种群的密度逐渐降低,种群的年龄结构均为衰退型.木荷Schima superba种群在3个群落中密度大小顺序为针阔混交林＞针叶林＞常绿阔叶林,种群的年龄结构均为增长型.甜槠Castanopsis eyrei种群仅出现在针阔混交林和常绿阔叶林中,在针阔混交林中甜槠种群密度较大,种群年龄结构为增长型,在常绿阔叶林中种群年龄结构为稳定型.种群分布格局随演替进程而变化,衰退型种群多为随机分布或均匀分布,而增长型或稳定型种群多为集群分布.表2参10

Dynamic characteristics of the dominant populations in different succession stages of evergreen broad-leaved forest on Tiantai Mountain in Zhejiang Province

Using the size class instead of age structure, the density dynamic and the distribution patterns of the dominant populations were studied, which were in the secondary sere community of evergreen broad-leaved forests on Tiantai Mountain in Zhejiang Province. The results showed that in the processes of succession from needle leaved forest to evergreen broad-leaved forest, the density of Pinus massoniana populations reduced gradually and the age structure of the populations was all decline pattern. The density sequences of Schima superba population in three communities were needle broad leaved mixed forest, needle leaved forest and evergreen broad-leaved forest. The age structure of the populations was all growing pattern. The Castanopsis eyrei population only appeared in needle broad leaved mixed forest and evergreen broad-leaved forest. The population density in needle broad leaved mixed forest was relatively greater and the age structure of the population was growing pattern, while the age structure of the population in evergreen broad-leayed forest was stable pattern. The distribution patterns of the populations changed with development of forest succession. The declined population was mostly randormly or uniformly distributed while the growing population or stable population was laryely aggregated distributed. Ch, 2 tab. 10 ref. ]