华北落叶松边材在树干中垂直分布的探讨

The Discussion of the Vertical Distribution in the Stem of the Sapwood Area of Larix Princiqis—rupprechtii Mayr

本文依据华北落叶松单木的资料,发现由心、边材颜色的不同来确定树干中边材面积时,随树干高度的降低边材面识逐渐增加。通过分析笔者认为:研究边材面积在树干中的垂直分布首先应明确边材的确定标准,仅仅由颜色的不同进行判断是不全面的。同时发现心材的形成在同一年轮内是从树干的上部开始向下逐渐发展的过程。

According to the stem analysis data of Larix principis—rupprechtii Mayr.it shows that when we definite the area of sapwood based on the different colour between the sapwood and the heartwood,it increases with the stem height we make it out that the studying of the vertical distribution in the stem of the sapwood area should identify the mark of sapwood firstly.It is not all correct only based on the different colour between the sapwood and the heartwood.Meanwhile,we have found that the formation of the heartwood in a year ring is succesively developed process from the top of the stem to the stem of downward.