翻訳と辞書 Words near each other ・ Brown Deer, Wisconsin ・ Brown Dense ・ Brown Derby ・ Brown Derby (actor) ・ Brown Derby (liquor company) ・ Brown diamonds ・ Brown dipper ・ Brown diving beetle ・ Brown Dog ・ Brown Dog affair ・ Brown dorcopsis ・ Brown dove ・ Brown dragon (disambiguation) ・ Brown dwarf ・ Brown eared pheasant ・ Brown earth ・ Brown Earth Presbyterian Church ・ Brown Edge, Staffordshire ・ Brown Elementary School (Berlin, New Hampshire) ・ Brown emutail ・ Brown energy ・ Brown Engineering ・ Brown Enhanced Automatic Rifle ・ Brown envelope journalism ・ Brown Estate ・ Brown Eye, Evil Eye ・ Brown Eyed Girl ・ Brown Eyed Girls ・ Brown Eyed Girls discography ・ Brown Eyed Handsome Man Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Brown earth ： ウィキペディア英語版 Brown earth Brown earth is a type of soil. Brown earths are mostly located between 35° and 55° north of the Equator. The largest expanses cover western and central Europe, large areas of western and trans-Uralian Russia, the east coast of America and eastern Asia. Here, areas of brown earth soil types are found particularly in Japan, Korea, China, eastern Australia and New Zealand. Brown earths cover 45% of the land in England and Wales. They are common in lowland areas (below 1,000 feet) on permeable parent material. The most common vegetation types are deciduous woodland and grassland. Due to the reasonable natural fertility of brown earths, large tracts of deciduous woodland have been cut down and the land is now used for farming. They are normally located in regions with a humid temperate climate. Rainfall totals are moderate, usually below 76 cm per year, and temperatures range from 4°C in the winter to 18°C in the summer. They are well-drained fertile soils with a pH of between 5.0 and 6.5. ==Horizontal structure== They generally have three horizons: the A, B and C horizon. Horizon A is usually a brownish colour, and over 20 cm in depth. It is composed of mull humus (well decomposed alkaline organic matter) and mineral matter. It is biologically active with many soil organisms and plant roots mixing the mull humus with mineral particles. As a result, the boundary between the A and B horizons can be ill defined in unploughed examples. Horizon B is mostly composed of mineral matter which has been weathered from the parent material, but it often contains inclusions of more organic material carried in by organisms, especially earthworms. It is lighter in colour than the A horizon, and is often weakly illuviated (leached). Due to limited leaching only the more soluble bases are moved down through the profile. Horizon C is made up of the parent material, which is generally permeable and non- or slightly acidic, for example clay loam. 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「Brown earth」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.