Isseirin - Isseirin

Japanese: 一斉林 - いっせいりん

...It is ideal for growing forests over many years, but it is essential that young trees grow easily, and there are some difficulties, such as the fact that young trees are easily damaged when felling or transporting cut trees, and the low income per unit area. On the other hand, umbrella felling is a method in which, when a forest of uniform tree species and age (uniform forest) reaches the cutting age, the trees are not all cut at once as in clear-cutting, but are cut in several stages, and is also called gradual felling. It is a felling method in which young trees grow under the umbrella of a parent tree, and it is a method of creating a forest of roughly uniform trees by repeating felling in stages. ...

From [Forest]

…(1) Aomori's hiba forests are distributed on both the Shimokita and Tsugaru peninsulas. In the Shimokita peninsula, the Nanbu clan successively cut down the larger hiba trees, so the forests are somewhat younger and multi-layered, while in the Tsugaru peninsula, the Tsugaru clan restricted the felling of hiba trees, so the forests are mostly old, uniform forests. Since the early Showa period, natural forest management experimental forests have been set up in parts of the hiba forests on both peninsulas, and ideal management is being carried out. …

*Some of the terminology used to refer to "Ichigairin" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…森林を長年にわたって育てていくには理想的であるが，稚樹の生えやすいことが必須条件であり，伐採や切った木を運び出す際に稚樹を傷めやすいことや単位面積当りの1回の収入が少ないなどの難しい点がある。一方，傘伐は樹種，樹齢がそろった林(一斉林)が伐期に達した時，皆伐のように一時に全部を切らず，数回に分けて切る方法で漸伐ともよんでいる。親木の傘の下に稚樹を育てる伐採方法という意味で，段階的に伐採を繰り返してほぼ同じ樹齢の林をつくる方法である。…

【森林】より

…(1)青森のヒバ林は下北，津軽の両半島に分布している。下北半島では南部藩がヒバの大径木から順に抜き切りをしていたので，若干若く複層林型を示し，津軽半島では津軽藩がヒバの伐採を制限していたので老齢な一斉林型が多い。両半島のヒバ林に対して昭和の初期からその一部に天然林施業実験林を設け，理想的な施業を行っている。…

※「一斉林」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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