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string bog : ウィキペディア英語版
string bog

A String bog or Strong mire is a bog consisting of slightly elevated ridges and islands, with woody plants, alternating with flat, wet sedge mat areas. String bogs occur on slightly sloping surfaces, with the ridges at right angles to the direction of water flow. They are an example of patterned vegetation.
Known as "Aapa" moore in Finland and Strangemoore in other parts of Northern Europe.
A string bog has a pattern of narrow (2–3m wide), low (<1m high) ridges oriented at right angles to the direction of drainage with wet depressions or pools occurring between the ridges. The water and peat are very low in nutrients because the water has been derived from other ombrotrophic wetlands, which receive all of their water and nutrients from precipitation, rather than from streams or springs. The peat thickness is >1m.
String bogs are features associated with periglacial climates, where the temperature results in long periods of subzero temperatures. The active layer exists as frozen ground for long periods and melts in the spring thaw. Such slow melting results in characteristic mass movement processes and features exclusively associated with specific periglacial environments.
==See also==

*Marsh
*Blanket bog

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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