麻池背油松天然林林分生长结构的研究

Study on Natural Forest Stand Structure of Pinus tabulaeformis in Machibei

依据历年调查资料,对麻池背油松天然林的林分生长结构进行了研究。该林分的植物种类丰富;直径、树高、林龄等林分结构呈正态分布、近似正态分布和多峰状分布;近熟林的林分蓄积生长率为0.82%,材积生长量69年生时连年生长量仍大于平均生长量。由于林分密度过大,油松形状比值偏高,林木自然稀疏强烈,枯损率达32.7%,其中小径木占86.3%,病虫害感染枯死木占29.4%。油松天然更新不良,辽东栎不能成为更新树种,林下有青木千、落叶松幼树分布。

Based on survey resources in the past years, natural forest stand structure of Pinus tabulaeformis in Machibei was studied. The results show that the plant species was abundant, and forest stand structure such as diameter, height and tree age is three kinds of distributions, which are normal distribution,approximately normal distribution, and muti-peaks distribution; forest stand volume growth rate of forest of near to mature is 0.82%; timber volume of 69-year-old tree is still more than average growth quantity. Because of too high dense forest stands, crown-stem ratio of Pinus tabulaeformis is high, the sparsity degree is intensive in nature. Meanwhile, shrivel rate of forest trees reaches 32.7%, of which the trees with little diameter are 86.3%; dead trees attacked by diseases and insects are 29.4%;Pinus tabulaeformis does not regenerate naturally, Quercus liaotungensis does not become the species for regeneration; there is distribute of Picea wilsonii and young Pinus tabulaeformis under the forest trees.