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Mollisols of the world Mollisols are generally associated with the steppe biome. Mollisol is a soil type which has deep, high organic matter, nutrient-enriched surface soil , typically between 60 and 80 cm (24-31 in) in depth. This fertile surface horizon, called a mollic epipedon, is the defining diagnostic feature of Mollisols.
This is a large area covering 407,000 square kilometres (157,000 sq mi) 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.
The soils, mostly Vertisols and Mollisols, are deep, loamy and clayey, and tend to be finer-textured than in the Lower Rio Grande Valley (34e) to the north. Some Entisols and Inceptisols occur near the river. The floodplain ridges once had abundant palm trees, and early Spanish explorers called the river "Rio de las Palmas." Most large palm ...
According to Theodore Roosevelt:. We have taken into our language the word prairie, because when our backwoodsmen first reached the land [in the Midwest] and saw the great natural meadows of long grass—sights unknown to the gloomy forests wherein they had always dwelt—they knew not what to call them, and borrowed the term already in use among the French inhabitants.
Silty, loamy, and sandy soils are formed from alluvium, though not as sandy as the Platte River Valley (27g) to the west. Land use is mainly cropland with areas of irrigated agriculture. Tallgrass prairie, wet meadows, and scattered riparian forests are the potential natural vegetation of the area, with forests generally denser and older than ...
Name Photo Location [4] Date formed Area [1] Description Midewin National Tallgrass Prairie: Illinois: 1996: 20,283 acres (82.1 km 2) [5]: The only federally managed prairie east of the Mississippi River, Midewin is in the Central forest-grasslands transition ecoregion and was created when land was transferred to the U.S. Forest Service from the U.S. Army.
Flowering big bluestem, a characteristic tallgrass prairie plant. The tallgrass prairie is an ecosystem native to central North America.Historically, natural and anthropogenic fire, as well as grazing by large mammals (primarily bison) provided periodic disturbances to these ecosystems, limiting the encroachment of trees, recycling soil nutrients, and facilitating seed dispersal and germination.
The terrain of the Southeastern Plains is dissected, rolling to smooth plains.The Cretaceous sands, silts, and clays of this region contrast geologically with the older metamorphic and igneous rocks of the Piedmont ecoregion, and with the Paleozoic limestone, chert, and shale of the Interior Low Plateaus ecoregion.