...As a result, many countries suffered from excessive deforestation, and the stock of native trees was drastically reduced. Therefore, in Italy, which suffered from a timber shortage especially during World War II, crossbreeding was carried out using P. nigra L. (black poplar) (illustration), its broom-shaped variant P. italica Koehne (Lombardy poplar) (illustration), and P. deltoides Marsh. (cottonwood) (illustration), and many early-maturing varieties, namely Italian poplar, were created. Furthermore, after the war, breeding using many more species was extensively promoted in various countries around the world, and many so-called improved poplar varieties were created. ... *Some of the terminology that refers to "American black poplar" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その結果,各国で乱伐に遭い,自生木の蓄積が激減してしまった。そこでとくに第2次大戦中の木材不足に悩まされたイタリアで,ヨーロッパクロヤマナラシP.nigra L.(英名black poplar)(イラスト),その変種で樹形がほうき状となるセイヨウハコヤナギvar.italica Koehne(英名Lombardy poplar)(イラスト)やアメリカクロヤマナラシP.deltoides Marsh.(英名cottonwood)(イラスト)などを使った交雑が行われ,多数の早生の品種すなわちイタリアポプラが作り出された。さらに戦後,より多くの種を用いた育種が世界各国で大々的に進められ,多くのいわゆる改良ポプラの品種が作られた。… ※「アメリカクロヤマナラシ」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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