...The trees are as old as 3,500 years old, and are famous for being old-growth forests. (3) Natural Douglas-fir forests These are large forests found on the west coast of North America, with many trees 70 meters tall and 3 meters in diameter. They grow quickly, and the accumulation exceeds 5,000 m3/ha. *Some of the terminology used to refer to "natural Douglas-fir forests" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…樹齢は3500年にも達し,老齢な森林であることでも有名である。(3)アメリカトガサワラ天然林 北アメリカ西海岸にみられる大森林で,樹高70m,直径3mのものが多い。生長が早く,蓄積は5000m3/haをこえる。… ※「アメリカトガサワラ天然林」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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