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Central forest-grasslands transition : ウィキペディア英語版 | Central forest-grasslands transition
The Central forest-grasslands transition are a prairie ecoregion of the central United States, an ecotone between eastern forests and the North American Great Plains. ==Setting== This is a large area covering from northern Illinois through most of Missouri, eastern Kansas, Oklahoma and into Texas. This area was traditionally a mixture of woodland and tall grass prairie, which as the soil consists of highly fertile mollisols, most of the area has been converted to farmland. Rainfall varies from 600–1040 mm per year and the area is vulnerable to drought and fire. Along with the Upper Midwest forest-savanna transition this ecoregion separates the Central U.S. hardwood forests to the east from the largely treeless Central and Southern mixed grasslands and Central tall grasslands to the west.
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