落叶松人工林下天然更新水曲柳的生长发育状况

Growth analysis of naturally regenerated Fraxinus mandshurica trees in Larix gmelinii plantations

通过对2个树龄类型落叶松人工林内水曲柳天然更新幼树的年龄结构、水平分布、生长级数量、种群生长指标和标准解析木树高生长量的调查,分析了水曲柳天然更新幼树的生长状况。结果表明,落叶松人工林林下水曲柳更新良好,在上层落叶松达到7～10 a时开始发生更新,间伐后会有新一波的更新发生,更新可以发生在林冠下、林隙内和林缘。25年生落叶松人工林中天然更新的水曲柳幼树生长发育状况比较正常,而35年生落叶松人工林下水曲柳幼树的生长发育受到严重抑制。说明要在保证上层落叶松的正常生长、下层水曲柳发育良好的状态下,构建落叶松人工林水曲柳天然林的混交林,必须及时对落叶松进行间伐、对水曲柳进行保育。

In order to understand the grow situation of Fraxinus mandshurica trees in Larix gmelinii plantations,we analyzed the growth of naturally regenerated F. mandshurica trees in 2 age-type L. gmelinii plantations based on the investigation on their age structure,regeneration position,tree quantity in different growth class,growth index and height increment of standard sample trees. The results showed that F. mandshurica exhibited good regeneration in larch plantations,the regeneration would be occurred when the L. gmelinii was 7-10 years old and new regeneration would be re-occurred after thinning,the regeneration could be occurred under the larch canopy,in gaps and along the plantation edge. The growth of the naturally regenerated F. mandshurica trees in the 25 years old L. gmelinii plantation was relatively normal,but that in the 35 years old L. gmelinii plantation was restrained seriously. This was indicated that if we want to establish a mixed forest with normally grown planted larch trees and well developed natural regenerated F. mandshurica trees,the on time thinning of the planted larch and taking good care of the naturally regenerated F. mandshurica trees was indispensable.