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A bog is a mire that accumulates peat, a deposit of dead plant material—often mosses, and in a majority of cases, sphagnum moss.〔Keddy, P.A. 2010. ''Wetland Ecology: Principles and Conservation'', (2nd edition). Cambridge University Press, ISBN 978-0521739672 〕 It is one of the four main types of wetlands. Other names for bogs include mire, quagmire, and muskeg; alkaline mires are called fens. They are frequently covered in ericaceous shrubs rooted in the sphagnum moss and peat. The gradual accumulation of decayed plant material in a bog functions as a carbon sink. Bogs occur where the water at the ground surface is acidic and low in nutrients. In some cases, the water is derived entirely from precipitation, in which case they are termed ombrotrophic (rain-fed). Water flowing out of bogs has a characteristic brown colour, which comes from dissolved peat tannins. In general, the low fertility and cool climate results in relatively slow plant growth, but decay is even slower owing to the saturated soil. Hence peat accumulates. Large areas of landscape can be covered many metres deep in peat.〔Gorham, E. (1957). The development of peatlands. Quarterly Review of Biology, 32, 145–66.〕〔 Bogs have distinctive assemblages of plant and animal species, and are of high importance for biodiversity, particularly in landscapes that are otherwise settled and farmed. ==Distribution and extent== Bogs are widely distributed in cold, temperate climes, mostly in boreal ecosystems in the Northern Hemisphere. The world's largest wetland is the peat bogs of the Western Siberian Lowlands in Russia, which cover more than a million square kilometres.〔L.H. Fraser and P.A. Keddy (eds.). 2005. The World’s Largest Wetlands: Ecology and Conservation. Cambridge University Press, Cambridge, UK.〕 Large peat bogs also occur in North America, particularly the Hudson Bay Lowland and the Mackenzie River Basin.〔 They are less common in the Southern Hemisphere, with the largest being the Magellanic moorland, comprising some 44,000 square kilometers. Sphagnum bogs were widespread in northern Europe〔(Country Pasture/Forage Resource Profiles: Latvia )〕 but have often been cleared and drained for agriculture. A 2014 expedition leaving from Itanga village, Republic of the Congo discovered a peat bog "as big as England" which stretches into neighboring Democratic Republic of Congo. 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「bog」の詳細全文を読む スポンサード リンク
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