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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Propagation of Christmas Trees ： ウィキペディア英語版 Propagation of Christmas Trees Christmas tree propagation is the series of procedures carried out to reproduce trees that are grown for sale as Christmas trees by tree farmers. The species and varieties that are propagated are limited by the type of tree farm that purchases the seedlings or rooted cuttings, the climate/environment where the trees will be grown, the climate/environment of the tree nursery, and what species and varieties that the end-consumer desires. ==Varieties of Traditional Christmas Trees== There are many different species of evergreen trees that are used for Christmas trees. The most common of these species are classified in one of four genera. The genera are: pines (genus Pinus), spruces (genus Picea), firs (genus Abies), and cypress (genus Cupressa). In addition to these, the Douglas fir (Pseudotsuga Menziesii) is also commonly used as a Christmas tree, but it is not a true fir. The most commonly grown species include Eastern White pine, Virginia pine, Scotch pine, Colorado Blue spruce, Norway spruce, Serbian spruce, White spruce, Balsam fir, Grand fir, Frasier fir, Canaan fir, Noble fir, (Turkish fir ), White fir, Blue Ice Carolina and Sapphire cypress (both are sterile hybrids of the Arizona cypress), Leyland cypress, Eastern Red cedar, and Douglas fir. These trees have become popular because of their appearance, color, aroma, texture, or a combination of these properties. The Norway spruce, Serbian spruce, Scotch pine, and Turkish fir are not native to the United States.〔(【引用サイトリンク】title=Christmas Trees and More )〕 However, genetic variations within these species have allowed some varieties to be grown in climates that differ substantially from the climate where the species originated. The Eastern White pine is native to the eastern U.S. The Colorado Blue Spruce is native Colorado and Utah. The White spruce is native to the north-central U.S. and Canada. The Noble, Douglas, and Grand firs are both native to the northwest of the U.S. The Balsam fir is native to the northeastern U.S. The Canaan fir is native to the Canaan Valley of West Virginia. The White fir is native to California and the Southwestern mountains of the U.S.〔(【引用サイトリンク】title=Silvics of North America Vol.1 )〕 From these varied trees, Christmas tree nurseries must select varieties to propagate based on the climate of their region and the type of farms that they will be selling to. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Propagation of Christmas Trees」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.