论文部分内容阅读
以“空间序列”代替“时间序列”的方法对渝西地区不同恢复方式下不同年龄的火烧迹地进行了调查研究,结果表明:火烧迹地的植被均匀度、丰富度和Shannon-Wiener指数等随恢复年限的变化曲线在人工恢复和自然恢复两种情况下有很大差异.实验中看不出两种恢复方式的不同是否能决定群落最终的物种多样性水平,但是不同的恢复方式可以加快或减缓物种多样性恢复的过程.实验还表明:在人工恢复的35年以内,多样性的恢复是一个“S”形变动的过程.人工恢复可以缩短灌木丛阶段的年限,加快乔木层的建成,同时促使该类型林区更长时间的停留在针叶林阶段,推迟该林区向顶级群落的演替进程;在自然恢复的40年以内,多样性的恢复是一个逐渐上升的过程,在最初的8年以内,其多样性不如人工恢复,但在恢复40年左右的时候,其多样性却可以达到一个比人工恢复高很多的水平.
The results showed that the vegetation evenness, richness and Shannon-Wiener index of the burned area were similar to those of the restored area, with the “spatial sequence” instead of “time series” The variation curve of years varies greatly between artificial and natural restoration, and it can not be seen in the experiment whether the difference of the two restoration methods can determine the ultimate species diversity of the community, but different recovery methods can be accelerated or slowed down The process of species diversity recovery.The experiment also shows that within 35 years of artificial restoration, the restoration of diversity is a process of “S” shape deformation.Artificial restoration can shorten the shrub period and speed up the arbor layer formation, at the same time This type of forest was more prolonged stay in the coniferous forest stage, postponed the succession process of the forest to the top community; within 40 years of natural recovery, the recovery of diversity is a gradual increase in the initial Within eight years, its diversity is not as good as that of artificial restoration, but its diversity can reach a much higher level of recovery than that of artificial restoration Level.