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grassland
Grasslands are areas where the vegetation is dominated by grasses (Poaceae), however sedge (Cyperaceae) and rush (Juncaceae) families can also be found. Grasslands occur naturally on all continents except Antarctica. Grasslands are found in most ecoregions of the Earth. For example, there are five terrestrial ecoregion classifications (subdivisions) of the temperate grasslands, savannas, and shrublands biome ('ecosystem'), which is one of eight terrestrial ecozones of the Earth's surface.
==Vegetation==
Grassland vegetation can vary in height from very short, as in chalk grassland, to quite tall, as in the case of North American tallgrass prairie, South American grasslands and African savanna.
Woody plants, shrubs or trees, may occur on some grasslands – forming savannas, scrubby grassland or semi-wooded grassland, such as the African savannas or the Iberian dehesa.〔(University of California Museum of Paleontology Grasslands website ). Ucmp.berkeley.edu. Retrieved on 2011-12-01.〕
As flowering plants and trees, grasses grow in great concentrations in climates where annual rainfall ranges between .〔(NASA Earth Observatory webpage ). Earthobservatory.nasa.gov. Retrieved on 2011-12-01.〕 The root systems of perennial grasses and forbs form complex mats that hold the soil in place.
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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