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本文用几种方法计算出山西太岳森林经营局好地方林场一片34年生油松人工林的叶面积指数(Leaf Atea Index)为13.088 5.总叶面积的60%多分布在3～6m深的冠层内,叶面积最大层位于林冠中部4～5m处.一年生叶面积最大层在林冠的中部偏上约1m,三年以上生(包括三年生)叶面积最大层在林冠中部稍偏下,二年生叶面积最大层在林冠中部.对整个林分来说,不同年龄的叶面积大致相等.光在林冠中的透射和被吸收与叶在林冠中的分布密切相关.林冠的消光系数为0.3779.
In this paper, the leaf Atea Index of a 34-year-old Pinus tabulaeformis plantation in a good local forest farm of Taiyue Forest Management Bureau in Shanxi Province was calculated to be 13.088 by several methods. (5) 60% of the total leaf area was distributed in 3 ~ 6m deep Within the canopy, the largest layer of leaf area is located at 4 ~ 5m in the middle of the canopy.The maximum layer of annual leaf area is about 1m above the middle of the canopy, and the largest layer of leaf area over three years (including three years) The maximum leaf area in the second year was in the middle of the canopy, and the leaf area was approximately the same at different ages for the entire stand.The light transmission and absorption in the canopy were closely related to the leaf distribution in the canopy.