论文部分内容阅读
在浙江省临安市选择典型天然次生灌丛,分别进行封禁和目标树抚育,探讨灌丛恢复为乔木林的可能性.结果表明:4年后,与未管护(对照)相比,封禁和目标树抚育后群落平均胸径分别提高1.3和2.6倍,平均高度分别提高0.5和1.1倍;目标树抚育林木出现了对照林分没有的4.5~8.5 cm径阶和4.5~8.5 m树高阶,形成了4 m高的新林层;灌木层物种丰富度和多样性指数没有因抚育而下降;封禁管理维持了群落的树种组成,遵循原有的演替方向;目标树抚育显著改变了群落的树种组成,提高了目的树种的重要值,近期有可能恢复成为针阔混交林群落.与封禁相比,目标树抚育在优势林木胸径和高度生长、树种组成改善等方面更能达到预想的目标.在有条件经营的情况下,可以选择目标树抚育模式对天然次生灌丛进行管理,从而达到加快群落恢复演替形成乔木林的目的.
In Lin’an City, Zhejiang Province, typical secondary shrubs were selected and banned and target tree nurtured respectively to explore the possibility of returning shrubs to arborvitae forest.The results showed that after 4 years, And average tree diameter increased by 1.3 and 2.6 times and average height increased 0.5 and 1.1 times respectively after tending the target tree. The target tree tending forest appeared 4.5 ~ 8.5 cm diameter step and 4.5 ~ 8.5 m high-order tree, A 4 m tall forest layer was formed; species richness and diversity index of shrub layer did not decline due to tending; closure management maintained the species composition of the community, followed the original succession direction; tending of the target tree significantly changed the community Tree species composition, increased the important value of the purpose of tree species, the recent may be restored as a coniferous and broad-leaved forest community. Compared with the ban, the target tree tending at the DBH and height growth of superior trees, to improve the composition of trees to achieve the desired goal. Under the conditions of conditional management, the secondary tree shrubs can be managed by choosing the target tree tending mode, so as to accelerate the succession of community restoration and succession to form the arbor forest.