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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 Dukes Research Natural Area ： ウィキペディア英語版 Dukes Research Natural Area The Dukes Research Natural Area is a tract of northern hardwood forest located within the ''Upper Peninsula Experimental Forest'', a unit of the Hiawatha National Forest in the Upper Peninsula of the U.S. state of Michigan. The Dukes Research Natural Area was listed in 1974 as a National Natural Landmark by the U.S. Department of the Interior. ==Ecology== The National Park Service describes the Upper Peninsula Experimental Forest as "an undisturbed white cedar and mixed conifer swamp containing old-growth hardwood stands." The Dukes Research Natural Area consists of several hardwood stands that grow on relatively higher, well-drained elevations within the swamp tract. The U.S. Forest Service (USFS) describes the Natural Area as an example of "well-stocked, mature northern hardwood forests that have been undisturbed for over 90 years."〔 Prior to 1920, the ecology of the Upper Peninsula was extensively altered by logging. The USFS notes the presence of black ash, yellow birch, American elm, eastern hemlock, red maple, and sugar maple in the National Natural Landmark.〔 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「Dukes Research Natural Area」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.