【摘要】 以苏木山不同林龄的华北落叶松人工林为研究对象,应用标准木法和枝解析木法研究华北落叶松枝、叶、果冠层分布特征。研究结果表明:(1)幼龄林和中龄林下层枝生物量所占比例最大(57.48%～61.75%),中层次之(33.21%～40.49%),上层最小(2.03%～5.04%);近熟林和成熟林中层枝生物量所占比例最大(45.71%～56.71%),下层次之(27.76%～42.92%),上层最小(11.37%～15.53%)。(2)幼龄林和中龄林叶主要分布于中层(36.43%～46.53%)和下层(45.95%～59.51%),近熟林和成熟林叶主要分布于中层(45.35%～56.58%)和上层(33.37%～38.44%)。(3)幼龄林和中龄林下层枝叶果所占比例最大,分别为58.14%和57.60%,近熟林和成熟林中层枝叶果所占比例最大,分别为45.80%和57.51%。结合苏木山华北落叶松冠层分布规律,建议苏木山华北落叶松人工林进入近熟林阶段进行修枝管理,有利于林分质量提升。更多还原

【Abstract】 Taking different-aged Larix principis-rupprechtii plantation in Sumu Mountains as research objects, the canopy distributing features of branches, leaves and fruits of Larix principis-rupprechtii were studied by use of standard tree method and branch analysis method. The results showed that in young forest and middle-aged forest, the proportion of lower branch biomass was the largest(57.48%-61.75%), followed by middle branch biomass(33.21%-40.49%) and upper branch biomass(2.03%-5.04%). In near-mature forest and mature forest, the proportion of middle branch biomass was the largest(45.71%-56.71%), followed by lower branch biomass(27.76%-42.92%) and upper branch biomass(11.37%-15.53%). The leaves of young forest and middle-aged forest mainly distributed in middle layer(36.43%-46.53%) and lower layer(45.95%-59.51%), the leaves of near-mature forest and mature forest mainly distributed in middle layer(45.35%-56.58%) and upper layer(33.37%-38.44%). The proportion of branches, leaves and fruits in lower layer of young forest and middle-aged forest was the largest, with 58.14% and 57.60% respectively. The proportion of branches, leaves and fruits in middle layer of near-mature forest and mature forest was the largest, with 45.80% and 57.51% respectively. Combined with the canopy distribution rule of Larix principis-rupprechtii, it is suggested that branch pruning should be done when Larix principis-rupprechtii plantation entering in the stage of near-mature forest, which could be favourable to the promotion of stand quality.更多还原