热带人工林土壤动物群落的次生演替和发展过程探讨

在广东小良地区的桉林迹地上,对不同林龄的阔叶混交林土壤动物的组成进行比较,探讨群落随林龄的增加而变化的过程。以多样性为基础,可将这里土壤动物群落的演替和发展分成3个阶段,即增长期、过渡期和稳定期。在林龄20多年后,群落发展可进入最后阶段。不同类群的演变程序:(1)湿生动物个体数逐渐增加,直至平稳;(2)昆虫中不稳定类群逐渐减少;(3)白蚁种群在增长期前段迅速增加,随后即在较低水平上受到控制;(4)蚯蚓在增长期后段才出现,并迅速成为优势类群。过渡期及其以前的蚯蚓种类主要为寒(虫宪)蚓属(Ocnerodrilus),稳定后为环毛蚓属(Pheretima)。

Secondary succession of soil animal community and its development process in tropical artificial forest.

Secondary succession of soil animal community in tropical littoral eroded land and its development process might be divided into three stages: aggradation, transition and steady state. The last stage will be arrived after about 20 years.The succession dynamics for various animal groups are.a)Individuals of hygrocolous microfauna increased quickly during aggradation stage, and decreased slightly during transition stage; b) Unstable groups of insects decreased gradually; c) Termites increased to a highest level in the earlier aggradation stage,then decreased and kept at a lower level;d) Earthworns appeared in the later stage of aggradation, then developed quickly and became a dominant group.