摘要
本文以人工林和天然次生林两类群落类型为研究对象,按生态恢复所经历的时间,把群落年龄归为A1、A2、A3和A4四个阶段。通过对两种生态恢复过程中群落α多样性动态变化规律的研究发现;(1)自然演替状态下,乔木层多样性变化不大,A1～A3阶段的灌木层多样性大于A4阶段。A1和A4阶段,草本层的多样性明显比A2～A3阶段大;A1～A3阶段人工林灌木层和草本层多样性有逐渐增大的趋势,到A3阶段人工林群落还没有达到稳定状态;(2)A1阶段天然林灌木层物种多样性大于人工林,随着演替的进行两者逐渐趋于一致;A1阶段天然次生林草本层多样性远大于人工林,从A2阶段开始人工林草本层多样性反而超过天然次生林。
In this paper researches are made on two kinds of community types,namely,silvicultural forest and natural secondary forest.According to the duration of ecological regeneration the ages of the communities are divided into the four stages:A1?A2?A3 and A4.Results have shown that:(1)In natural regeneration treatment,the diversity of trees is similar among four stages,the diversity of shrubs in stage A1～A3 is higher than in stage A4.The diversity of herbages in stage A1 and A4 is significantly higher than in stage A2 and A3.In silvicultural regeneration treatment,the diversity of shrubs and herbages increases gradually in stage A1～A3,and the variation will continue after stage A3,further work is needed to examine the dynamic.(2)The diversity of shrubs in natural regeneration treatment is higher than in silvicultural regeneration treatment in stage A1,and the difference between them decreases gradually since stage A2.The diversity of herbages in natural regeneration treatment is significantly higher than in silvicultural regeneration treatment in stage A1.On the contrary,the diversity of herbages in silviicultural regeneration treatment is higher than in natural regeneration treatment since stage A2.
出处
《四川林业科技》
2004年第1期10-15,共6页
Journal of Sichuan Forestry Science and Technology
基金
国家重点基础研究发展规划项目(G20000046807)
关键词
群落多样性
植物群落
生态恢复
卧龙
Community diversity,Plant community,Regeneration,Disturbance,Wolong
