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Fundamental studies on the conservation of forest genic resources and long rotation working

森林遗传资源保护与长期轮作的基础研究

基本信息

批准号：
62560153
负责人：
HASHIZUME Hayato
金额：
$ 1.28万
依托单位：
Tottori 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：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62560153/
关键词：
pine Zelkova Quercus variation bark characteristic long rotation working high quality wood 良質材アベマキ高品質材

项目摘要

In this study, the following two studies were performed during two years.1. Studies-on variations in mixed stands of Quercus acutissima and Q. variabilis and in pure stands of Q. acutissima. In mixed stands, Q. acutissima, Q. variabilis and their hybrids were obseved. These three species could be easy distinguished by the state leaf hair and the thickness and quality of outer bark. There was a positive correlation between the quantity of leaf hair and the thickness of outer bark. In Q. variabilis, the thickness of outer bark increased with increasing breast height diameter. In the secondary stands of O. acutissima, four types were observed on bark form. the type of bark form, the thickness of bark and the state of bark splits varied according to individual trees and localities.2. Studies on the growth, characteristics and timber price of old pine trees and some useful broad-leaved trees. Old trees of the Bakaku pine were 180-200 years in tree age, 70-110 cm in breast height diameter. The color of heart-wood was reddish brown or light reddish brown and the percentage of heart-wood was 65 % on average. The diameter growth was quick during the first 50-80 years and thereafter it decreased slowly. In broad-leaved trees, two types of growth, namely, early growth and late growth, were recognized. Prunus jamasakura grew into a diameter class suitable for utilization within 50-60 years, while Zelkova serrata took more than 150 years to attain a suitable for lumber. The log price varied with species, wood quality and log size. In pine trees and Z. serrata, log prices showed a rising tendency with the increasing diameter of logs.

在这项研究中，在两年内进行了以下两项研究。麻栎、青冈混交林分的动态变化。variabilis纯林中的变异系数为0. acutissima。在混交林中，Q. acutissima、麻栎Q. variabilis及其杂种进行了观察。根据叶毛状态、外树皮的厚度和质量可将这3种植物区分开来。叶毛的数量与树皮的厚度呈正相关。在Q.外树皮厚度随胸径的增大而增大。在O. acutissima，树皮形态有4种类型。树皮形态类型、树皮厚度和树皮劈裂状态因个体和地点而异.古松及几种有用阔叶树生长、材性及材价之研究。长白松古树树龄180-200年，胸径70-110 cm。心材颜色为红棕色或浅红棕色，平均心材率为65%。直径生长在前50-80年迅速，以后缓慢下降。在阔叶树中，两种类型的生长，即早期生长和晚期生长，被确认。山樱花在50-60年内生长到适合利用的直径级，而榉树则需要150多年才能达到适合木材的直径级。原木价格因树种、木材质量和原木尺寸而异。在松树和Z.锯缘材的原木价格随着原木直径的增加而呈上升趋势。