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首页> 外文期刊>Journal of Forest Planning >Estimating of Timber Resources from Large Diameter and Long Materials Used for Wooden Cultural Buildings
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Estimating of Timber Resources from Large Diameter and Long Materials Used for Wooden Cultural Buildings

机译：木制文化建筑用大直径长材料的木材资源估算

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摘要

Wooden cultural buildings are a symbol of Japanese culture. It is necessary to secure a supply of large logs to maintain these important cultural buildings in perpetuity. Besides to having a large diameter and length, these logs need to have a high quality of wood. However, it is difficult to secure a permanent supply of such logs. That is because required large diameter and long materials logs are usually not offered at a customary timber-market. Prescribed conditions to maintain important culturalbuildings are strict and require using the same building technique as well as using the same tree species of the same tree quality. That imposes a demand for the trees of the same kind, size and wood quality as it is used in existing wooden cultural buildings. Therefore, there is a need to conduct a research on the quantity of the demand and to investigate capability of forests to fulfill such demands. We need to secure a sufficient supply of required trees and to find out a present state of large sizedtrees. This paper presents our developed technique to estimate a standard size of standing trees which have served to produce a large-sized building material for wooden structures.We have taken a representative sample from published reports on Japan's cultural buildings built throughout Heian (794-1185) and Kamakura (1185-1333) period. Furthermore, in order to presume the size of saw-wood, we have measured logs at the warehouse and have calculated the width of sapwood. Moreover, in order to calculate the height and the relative taper-curve using a three-order equation, we have measured heights, DBH as well as diameters along the trunks of standing Japanese cypress trees growing at Kiso area of Japan. Finally, we have estimated standard sizes of standing trees which have served to produce a large-sized building material for wooden structures.Now, we have information on standard sizes of standing trees which have served to produce a large-sized building material for wooden structures. Furthermore, using our developed technique and measuring only the DBH, now we can assess a present state of standing trees being suitable for the maintenance of wooden cultural buildings. The standing trees being the most difficult to obtain were the trees of size used to build the 18 pillars of Nandaimon at Todaiji temple. These pillars have a size of 1 meterin diameter and 19.17 meters in length. We have estimated that the standing trees should have a DBH more than 150 cm to be of use in producing such large sized pillars. Even at Kiso area where a large-sized Japanese cypress trees still can be found, it is extremely difficult to secure a supply of trees having a DBH larger than 150 cm. Hereafter, the present state of large trees should be assessed. Furthermore, a relatively large forest area should be bequeathed for the purpose of securing a permanent supply of large-sized trees having a required good-quality. Our next tasks are to follow up the growth of the prospective trees in forests.
机译：木制文化建筑是日本文化的象征。有必要确保大量原木的供应，以使这些重要的文化建筑永存。除了具有大的直径和长度之外，这些原木还需要具有高质量的木材。但是，很难保证这种原木的永久供应。这是因为通常的木材市场通常不提供所需的大直径和长材料原木。维护重要文化建筑的规定条件是严格的，并且要求使用相同的建筑技术以及使用相同树种的相同树种。这就要求与现有木制文化建筑中使用的树木种类，大小和木材质量相同。因此，需要对需求量进行研究并调查森林满足这些需求的能力。我们需要确保足够的所需树木供应，并找出大型树木的当前状态。本文介绍了我们开发的估算立木标准尺寸的技术，这些立木用于生产大型木结构建筑材料。我们从发表的有关整个平安时代（794-1185）日本文化建筑的报告中提取了代表性样本和镰仓（1185-1333）时期。此外，为了推测锯木的尺寸，我们在仓库测量了原木并计算了边材的宽度。此外，为了使用三阶方程计算高度和相对锥度曲线，我们测量了在日本木曾地区生长的站立的日本柏树树干的高度，DBH以及直径。最后，我们估算了用于生产大型木结构建筑材料的立木的标准尺寸。现在，我们掌握了用于生产木结构大型建筑材料的立木的标准尺寸的信息。此外，使用我们开发的技术并仅测量DBH，现在我们可以评估适合维护木制文化建筑的立木的现状。最难获得的立树是在东大寺建造南大门18根柱子的树木。这些支柱的直径为1米，长度为19.17米。我们估计站立的树木的DBH应该超过150厘米，才能用于生产这种大尺寸的支柱。即使在仍然可以找到大型日本柏树的木曾地区，也很难确保DBH大于150厘米的树木的供应。此后，应评估大树的现状。此外，应该保留相对较大的森林面积，以确保永久供应具有所需质量的大型树木。我们的下一个任务是跟进森林中预期树木的生长。

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