大青山林区米老排人工林伐桩萌芽更新研究

以33年生米老排伐桩为研究对象，分析了不同伐桩基径(≤30 cm、30＜X≤40 cm、40＜X≤50 cm、＞50 cm)及伐桩高度(≤5 cm、5＜Y≤10 cm、10＜Y≤20 cm、＞20 cm)对其萌芽植株数量、胸径及高度等生长状况的影响。结果表明，4个不同的伐桩基径级之间，30＜X≤40 cm其萌芽植株数量、胸径及高生长较大；伐桩基径对其萌芽植株数量影响差异显著，但对胸径及高生长影响差异不显著。伐桩高度在≤5 cm和5＜Y≤10 cm时，其萌芽植株数量、胸径及高生长较大，且随着伐桩高度的增加而降低。

Effeets of Varied Diameter and Height of Stump on Sprout Regeneration of Mytilaria laosensis Plantations in Daqingshan

By taking the stumps of 33 a Mytilaria laosensis as the research objects,the effects of different stump basal diameters (≤30,30＜X≤40,40＜X≤50,＞50 cm) and heights (≤5,5＜Y≤10,10＜Y≤20,＞20 cm) on DBH and height of stump sprouting were analyzed.Among four stump basal diameters,the number,DBH and height of stump sprouting were the biggest in the diameter range of 30＜X≤40 cm.The stump basal diameter demonstrated significant effects on the number of sprouting,while the influences of DBH and height of the stump were not significant.When the stump height was between ≤5 cm and 5＜Y≤10 cm,the number,DBH and height of stump sprouting were the biggest,and decreased with the stump height.