The Growth and Wood Quality of Trees Managed with Various Systems of Density Control for Sugi (Cryptomeria japonica D. Don) Stands.

采用各种密度控制系统管理的杉树（Cryptomeria japonica D. Don）林的生长和木材质量。

基本信息

批准号：
59560153
负责人：
IWAG@AMI Seiro
金额：
$ 1.09万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59560153/
关键词：
Sugi Wood Quality Reee Growth Density Control Annual Ring Width Basic Density Tracheid 力学的性質

项目摘要

To study the relation between growth and wood quality of trees managed with various density control systems, the three typical districts (Kito district - sparse planting ;Kuma district - dense planting; Aki district - standard plantation) of Sugi plantation in Shikoku island were selected. The 12 sample trees in each district were investigated.The results obtained are as follows:(1) In middle aged stands, the difference of annual ring width between Kito and the other districts are significant at the 1% level.(2) Kito managed with low density is well growing.(3) On the properties of appearance of wood, the length of dead/live branch knot in Kito district is longer than it in other district, the sapwood begins to form at a disk diameter of 6 - 8cm, and there is a highly significant relationship between heartwood diameter and disk diameter in all stands.(4) A tree with large radius increments has longer tracheids in both juvenile and mature wood.(5) On the physical properties of wood, the most important factor influencing basic density is the percentage of late wood. There is negative correlation between ring width and basic density with wide variation between individual tree. On the strength properties of wood, the bending and compressive strength is directly proportional to the specific gravity. The average strength of wood from Kito is low because of its low specific gravity.

为了研究通过各种密度控制系统管理的树木的生长与木质之间的关系，选择了Shikoku岛Sugi Plantation的三个典型地区（稀疏的种植；繁殖区 - 茂密的种植 - 标准种植园）。 The 12 sample trees in each district were investigated.The results obtained are as follows:(1) In middle aged stands, the difference of annual ring width between Kito and the other districts are significant at the 1% level.(2) Kito managed with low density is well growing.(3) On the properties of appearance of wood, the length of dead/live branch knot in Kito district is longer than it in other district, the sapwood begins to form at a disk直径为6-8厘米，在所有架子上，心脏直径和磁盘直径之间都有高度显着的关系。（4）幼年和成熟木材的气管含量较大。（5）在木材的物理特性上，木材的物理性质，最重要的因素影响基本密度最重要的因素是木材后期木材的百分比。环宽与基本密度之间存在负相关，各个树之间的变化很大。在木材的强度特性上，弯曲和抗压强度与特定重力成正比。由于其特异性低的重力，因此木材的平均木材强度很低。