不同疏伐密度对油松天然更新的影响

Effect of Different Thinning Density on Natural Regeneration of Pinustabulaeformis

采用固定标准地观测方法,研究分析了辽宁阜新半干旱区油松母树林不同疏伐密度对天然更新的影响,旨在为半干旱区油松林的科学经营提供理论与技术依据。结果表明:油松天然更新状况和母树林密度有密切关系,在低密度林分下,天然更新幼树数量增加;在高密度林分下,天然更新幼树数量没有明显增加或无更新的变化规律和特征。对油松母树林下天然更新幼树进行疏伐密度处理后,天然更新幼树地径和树高都有明显增长,表明油松在更新密度较大情况下进行疏伐有利于天然更新幼树的生长。

In order to provide theoretical&technical basis for the scientific management of Pinus tabulaeformis plantation,the effects of different thinning density on natural regeneration and saplings growth of Pinus tabulaeformis seed stand in semiarid region of Fuxin City of Liaoning Province were discussed by employing the observation of permanent plots.Result shows that the natural regeneration of Pinus tabulaeformis is closely related to the density of seed forest.Under the low-density stands,the number of natural regeneration saplings increase,and under the high-density stands,the number of natural regeneration saplings have no obvious increase or no updated change rule&characteristics.After density thinning treatment on natural regeneration saplings of Pinus tabulaeformis,diameter&height both increase significantly,which indicates that the thinning under the higher density are profitable to the natural regeneration of saplings.