Raised bog

Article

January 18, 2022

Raised bog is a type of wetland (English: wetland) and refers to grasslands moistened by fresh water. Translated as moor or bog in English.

Raised bog type

Peatlands and non-flarks

Freshwater wetlands are divided according to the presence or absence of peat. Flark Land where plant remains are deposited as they are due to lack of air necessary for the decomposition of microorganisms due to the high water content. Cold peat is mainly composed of sedges and sphagnum moss and is soft. Even in the tropics, tropical peatlands are formed in areas where annual rainfall exceeds 3000 mm, but peat consisting of crushed tree trunks is black and rugged. Non-flark Land like sand or clay where plant remains have not been decomposed and left. Most wetlands are non-flarks because the tropics are hot and decompose quickly.

Fen and Bog

In forests, fallen leaves and dead branches are decomposed by microorganisms, become soil, and are absorbed by plants, so there is no shortage of nutrients. However, in the marsh, nutrient circulation does not occur because the plant remains become peat. The peat bog grows thicker at a rate of about 1 millimeter per year due to the accumulation of plant remains. Fen A plant community in which minerals, especially calcium-containing water, flow in from the surrounding waters. Even if there is no circulation like a forest, the plants grow large because they are rich in nutrients. Bog A plant community that has become dome-shaped at the end of peat accumulation, and water from rivers and swamps can no longer reach even if floods occur. The supply of water is limited to rain and snow, and the water is strongly acidic due to the action of plants.

Low and high

Raised bogs are also classified by the height difference from the surrounding water area. Raised bog Raised bog with a low peat surface and the same height as the surrounding water area. It is roughly equivalent to Fen, but there are exceptions. Raised bog A marsh with a peat surface that has developed to a height where the water flowing in from the surroundings cannot reach. It is roughly equivalent to a bog.

Raised bog location by climate classification

Raised bogs are ubiquitous on earth, except in extremely dry areas such as deserts. Subarctic Eurasian Continent-The cold climate makes the marsh a permafrost and is called a tundra. It is distributed from Eastern Siberia to the Ural Mountains, especially in the basin of the Lena River. North America-Large marshes stretch from northwestern Canada to Alaska. It is characterized by being finely divided by low rocks. South America-There is a large marsh in Patagonia. The marshlands of Tierra del Fuego on the island of Tierra del Fuego have been significantly lost due to ancient grazing. Navarino Island also has the southernmost marshland in the world. Oceania-Exists on Tasmania. Temperate zone It is often found in "cold temperate zones" where the temperature is relatively low. The area is not very large, but each has various characteristics. Europe-From the Mediterranean coast to southern Scandinavia. Jutland Peninsula. The estuary of the Donau River on the Black Sea coast. East Asia-From northeastern China to a little south. North America-Both Pacific and Atlantic coasts. Australia-East coast. Warm zone Mediterranean coast-Northern Africa, southern Spain and France. Tropical / subtropical Unlike other areas, mangroves are developed on the beach. Southeast Asia-Countries in the region, Bangladesh, India. North America / Mexico-Gulf of Mexico coast.

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