…The name comes from the fact that the topsoil is black and feels lumpy when you step on dry soil, hence the nickname “kuroboku.” For the same reason, in the Shikoku region, it is called “onji.” It is used almost synonymously with the narrow definition of volcanic ash soil. … From [Special Soil]…It refers to special volcanic deposits such as Shirasu (volcanic deposits of plagioclase trachyte found in southern Kyushu), Bora (colloquial name for pumice found in southern Kyushu), Kora (slightly consolidated volcanic gravel found at the southern tip of the Satsuma Peninsula in Kagoshima Prefecture), Masa (volcanic gravel around Mount Fuji), Akahoya, Onji, and Imogo, as well as weathered granite soils and other soils that are particularly susceptible to erosion. They are found mainly in Kyushu, Shikoku, and Chugoku, but are particularly widespread in the southern Kyushu region. … *Some of the terminology that mentions "Onji (soil)" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…表土の色が黒く,乾いた土を踏むとボクボクする感じからつけられた〈黒ボク〉という俗称に由来する。四国地方では同じ理由でオンジとよばれる。狭義の火山灰土壌とほぼ同義に使われる。… 【特殊土壌】より…シラス(南九州に分布する斜長石英粗面岩質の火山堆積物),ボラ(南九州に分布する軽石の俗称),コラ(鹿児島県薩摩半島南端に分布するやや固結した火山砂礫(されき)層),マサ(富士山周辺の火山砂礫層),アカホヤ,オンジ,イモゴと呼ばれる火山灰層などのように,特殊な火山噴出物および花コウ岩風化土,その他とくに侵食をうけやすい土壌をいう。九州,四国,中国を中心に分布するが,とくに南九州地方に広く分布する。… ※「オンジ(土壌)」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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