<正>本文研究了混交林对祥云新松叶蜂低龄幼虫种群动态的影响,结果表明:同纯林相比,混交林中幼虫种群在林冠内猖獗发生时间长,转移扩散至林间的幼虫,种群数量不但没有以强扩散趋势增长,和持续约20天的猖獗发生动态,且格局呈聚集趋势。混交林能抑制害虫种群数量增长和空间扩展,从而抑制害虫的发生与危害。树种的空间分隔和食性多寡是混交林抑制害虫发生与危害的重要表面原因。

Effects of mixed forest on immature larvae population dynamic of N. xiangyunicus arc studied in this paper. The results show that the happening period is seriously longer with immature larvae population incrown at mixed forest, there isn’t a serious dynamic oflarvac populattion by increasing with hard spread trend and continuing about 20 days, but it’s an aggregated pattern, compared with pure forest. The spread in space and the increase in quantity of pest population arc restrained in mixed forest, therefore the happening and damage of pest are restrained, the space separating of forest phase and the number of kinds with feeding plants of forest pest are main superficial reasons.