落叶松人工中近熟林大径材定向培育技术

Preliminary Studies on the Directional Breed of Large Timber of the Planted Larch Middle and Adolescent Forest

本文通过对落叶松人工中近熟林大径材定向培育试验区与其它保留密度试验区的调查分析比较得出；大径材培育措施可以提高林分的直径、树高和材积生长量；获取较高的间伐经济效益；改善林内的光照条件，增加林冠下植物种类和覆盖度；增强林冠下植物天然更新能力，促进异龄复层混交林的形成，缩短培育周期。林冠下人工更新红皮云杉等耐阴树种，大径材培育试验区比其它试验区生长良好。同时，对常规落叶松人工林进行大径材定向培育的时间和保留密度等方面提出了初步建议。

Through observing and analyzing on the experimental area of the directional breed of large timber of the planted larch middle and adolescent forest with others, the results showed that the measure of the directional breed of large timber,could increase diameter, height and volume increment.gain high intermediate yield, improve illuminance within the forest, increaseplant kinds and vegetatation cover under crown canopy, strengthen natural regeneration under orown canopy, advance the form of uneven aged mixed stand, shorten breeding period. The suitable time and density of the directional breed of large timber of planted larch are also discussed.