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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 List of oldest trees ： ウィキペディア英語版 List of oldest trees This is a list of the oldest known trees, as reported in reliable sources. Definitions of what constitutes an individual tree vary. In addition, tree ages are derived from a variety of sources, including documented "tree-ring" count core samples, and from estimates. For these reasons, this article presents three lists of "oldest trees", each using varying criteria. There are three tables of trees, which are listed by age and species. The first table includes trees for which a minimum age has been directly determined, either through counting or cross-referencing tree rings or through radiocarbon dating. Many of these trees may be even older than their listed ages, but the oldest wood in the tree has rotted away. For some old trees, so much of the centre is missing that their age cannot be directly determined. Instead, estimates are made based on the tree's size and presumed growth rate. The second table includes trees with these estimated ages. The last table lists clonal colonies in which no individual tree trunks may be remarkably old but in which the organism as a whole is thought to be very old. The current record-holders for individual, non-clonal trees are the Great Basin bristlecone pine trees from California and Nevada, in the United States. Through tree-ring cross-referencing, they have been shown to be more than five millennia old. A clonal colony can survive for much longer than an individual tree. A colony of 47,000 quaking aspen trees (nicknamed "Pando"), covering in the Fishlake National Forest of Utah, is considered one of the oldest and largest organisms in the world. The colony has been estimated to be 80,000 years old, although tree ring samples date individual, above-ground, trees at only an average of about 130 years.〔(【引用サイトリンク】title=''Botanical Record-Breakers'' )〕〔(【引用サイトリンク】title=''Quaking Aspen'' )〕〔(【引用サイトリンク】title=''SPECIES: Populus tremuloides'' )〕 A colony of Huon pine trees covering on Mount Read, Tasmania is estimated to be around 10,000 years old, as determined by DNA samples taken from pollen collected from the sediment of a nearby lake. Individual trees in this group date to no more than 4,000 years old, as determined by tree ring samples.〔(【引用サイトリンク】title=''Native Conifers of Tasmania'' )〕 ==Individual trees with verified ages== 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「List of oldest 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.