Tallgrass prairie

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Flowering big bluestem, a characteristic tallgrass prairie plant

The tallgrass prairie is an ecosystem native to central North America. Natural and anthropogenic fire, as well as grazing by large mammals (primarily bison), were historically agents of periodic disturbance, which regulates tree encroachment, recycles nutrients to the soil, and catalyzes some seed dispersal and germination processes. Prior to widespread use of the steel plow, which enabled conversion to agricultural land use, tallgrass prairies expanded throughout the American Midwest and smaller portions of southern central Canada, from the transitional ecotones out of eastern North American forests, west to a climatic threshold based on precipitation and soils, to the southern reaches of the Flint Hills in Oklahoma, to a transition into forest in Manitoba.

They were characteristically found in the central forest-grasslands transition, the central tall grasslands, the upper Midwest forest-savanna transition, and the northern tall grasslands ecoregions. They flourished in areas with rich loess soils and moderate rainfall around 30-35 inches (700–900 mm) per year. To the east were the fire-maintained eastern savannas. In the northeast, where fire was infrequent and periodic windthrow represented the main source of disturbance, beech-maple forests dominated. In contrast, shortgrass prairie was typical in the western Great Plains, where rainfall is less frequent and soils are less fertile. Due to expansive agricultural land use, very little tallgrass prairie remains.

History of origin and demise[edit]

Retreating glaciers deposited the parent material for soil in the form of till, i.e. unsorted sediment, about 10,000 years ago. Wind-dropped loess and organic matter accumulated, resulting in deep levels[citation needed] of topsoil. Animals such as bison, elk, deer, and rabbits added nitrogen to the soil through urine and feces. Prairie dogs, a ground squirrel-like rodent considered to be a keystone species, dug tunnels that "aerated the soil and channeled water several feet below the surface."[1] For 5,000 to 8,000 years, more than 240 million acres (970,000 km2) of prairie grasslands were a major feature of the landscape.[2] Between 1800 and 1930, the vast majority was destroyed. Settlers transformed what they named "the Great American Desert" or "The Inland Sea" into farmland. Major reasons for the prairie's demise were the confined grazing pattern of European cattle versus bison, the near-extermination of prairie dogs, and the plowing and cultivation of the land, which breached tallgrass root systems and interrupted reproduction. Further, extensive tile drainage has changed the soil's water content and hydrodynamics, and ongoing soil erosion results in its increasing loss.

Estimates differ of how much original tallgrass prairie survives, ranging from less than 1% mostly in "scattered remnants found in pioneer cemeteries, restoration projects, along highways and railroad rights-of-way, and on steep bluffs high above rivers"[1] to 4%.

Ecosystem[edit]

Tallgrass prairie is capable of supporting significant biodiversity. Parts of the ecoregion among the "top ten ecoregions for reptiles, birds, butterflies, and tree species. Tallgrass species are found in the understory layer."[3] Oak (blackjack oak (Quercus marilandica) and post oak (Q. stellata) ) and hickory tree species occur in some areas, but generally in moderate densities. Bison (Bison bison) were a dominant species.[3]

The tallgrass prairie biome depends on prairie fires, a form of wildfire, for its survival and renewal.[4] Tree seedlings and intrusive alien species without fire tolerance are eliminated by periodic fires. Such fires may either be set by humans (for example, Native Americans used fires to drive bison and improve hunting, travel, and visibility) or started naturally by lightning.

Boundaries[edit]

Tallgrass prairie in relation to the Great Plains
  Tallgrass prairie

As its name suggests, the most obvious features of the tallgrass prairie are tall grasses, such as indiangrass (Sorghastrum nutans), big bluestem (Andropogon gerardi), little bluestem (Schizachyrium scoparium), and switchgrass (Panicum virgatum), which average between 4.9 and 6.6 ft (1.5 and 2 m) tall, with occasional stalks as high as 8.2 to 9.8 ft (2.5 to 3 m). Prairies also include a large percentage of forbs, such as lead plant (Amorpha spp.), prairie rosinweed (Silphium spp.), gayfeathers (Liatris spp.), sunflowers (Helianthus spp.), asters (Aster and Symphyotrichum spp.), coneflowers (Echinacea spp., and Rudbeckia spp.), and many other species.

Technically, prairies have less than 5–11%[clarification needed] tree cover.[citation needed] A grass-dominated plant community with 10–49% tree cover is a savanna.

After the steel plow was invented by John Deere, this fertile soil became one of America's most important resources. Over 95% of the original tallgrass prairie is now farmland.

Remnants[edit]

Bison grazing on the 158 km2 (39,000-acre) Tallgrass Prairie Nature Preserve in Osage County, Oklahoma
A pink wild onion (Allium stellatum) — blooms in the tallgrass prairie of Waubay Wetland Management District in South Dakota.

The tallgrass prairie survives in areas unsuited to plowing: the rocky hill country of the Flint Hills, which runs north to south through east-central Kansas; the eastern fringe of the Red River Valley (Tallgrass Aspen Parkland) in Manitoba and Minnesota; the Coteau des Prairies, which extends from South Dakota through Minnesota and into Iowa; and the far north portion of Oklahoma. In Oklahoma, the tallgrass prairie has been maintained by ranchers, who saw the hat-high grass as prime grazing area for cattle.

The 39,000-acre (158 km2) Tallgrass Prairie Preserve in Osage County, Oklahoma, and the somewhat smaller 10,900-acre (44.1 km2) Tallgrass Prairie National Preserve in Kansas, attempt to maintain this ecosystem in its natural form. They have reintroduced plains bison to the vast expanses of grass.[4] Other U.S. preserves include Midewin National Tallgrass Prairie in Illinois, Broken Kettle Preserve and Neal Smith National Wildlife Refuge in Iowa, Konza Prairie in Kansas, and Prairie State Park in Missouri. In eastern North Dakota is Sheyenne National Grassland, the only national grassland on the tallgrass prairie. Also, several small tallgrass prairie reservations are in Cook County, Illinois, including the National Natural Landmark, Gensburg-Markham Prairie.[5]

The original extent of tallgrass prairie in Canada was the 2,300-square-mile (6,000 km2) plain in the Red River Valley, southwest of Winnipeg in Manitoba (see map).[6] While most of Manitoba's tallgrass prairie has been destroyed through cultivation and urban expansion, relatively small areas persist. One of the largest blocks of remaining tallgrass prairie in Manitoba is protected by several conservation partners in a conservation area called the Tallgrass Aspen Parkland. The Manitoba Tall Grass Prairie Preserve, which occupies small portions of the rural municipalities of Stuartburn and Franklin, forms a part of the Tallgrass Aspen Parkland. This preserve contains about 4,000 ha (9,900 acres) of tallgrass prairie, aspen parkland, and wetlands.

A small pocket of less than 1,200 acres (5 km2) of tallgrass prairie remains in the southwest corner of Windsor, Ontario, protected by Ojibway Park, and Spring Garden Area of Natural Scientific Interest, along with the interconnected parks: Black Oak Heritage Park, Ojibway Prairie Provincial Nature Reserve, and the Tallgrass Prairie Heritage Park. Aside from the Provincial Nature Reserve, all are operated by the City of Windsor's Parks and Recreation.

Restoration[edit]

Considered the birthplace of ecological restoration, the first tallgrass prairie restoration was the 1936 Curtis Prairie at the University of Wisconsin-Madison Arboretum. [7] Civilian Conservation Corps workers replanted nearby prairie species onto a former horse pasture, overseen by University faculty including renowned ecologist Aldo Leopold, botanist Theodore Sperry, mycologist Henry C. Greene, and plant ecologist John T. Curtis. Curtis and his graduate students surveyed the whole of Wisconsin, documenting native species communities and creating the first species lists for tallgrass restorations.[8] Existing prairie remnants, such as locations within pioneer cemeteries and railroad rights-of-way, were located and inventoried by Curtis and his team. The UW Arboretum was the center of tallgrass prairie research through the first half of the 20th century, with the development of the nearby Greene Prairie, Aldo Leopold Shack and Farm and pioneering techniques like prescribed burning.[9]

The latter-half of the 20th century saw the growth of tallgrass prairie restoration beyond Wisconsin borders. The 285-hectare Green Oaks Biological Field Station at Knox College began in 1955 under the guidance of zoologist Paul Shepard. It was followed by the 40-hectare Schulenberg Prairie at the Morton Arboretum, started in 1962 by Ray Schulenberg and Bob Betz. Betz then worked with The Nature Conservancy to establish the 260-hectare Fermi National Laboratory tallgrass prairie in 1974.[7] These major tallgrass restoration projects marked restorations growth from isolated studies to widespread practice.

Tallgrass prairie restoration efforts picked up wider public recognition in the 1980s, spurred by the publication of a book of appreciation, John Madson's Where the Sky Began: Land of the Tallgrass Prairie (1982).[10] Nonprofit organizations throughout the former tallgrass prairie region began to reserve or restore small remnants of native prairie. For example, the Native Prairies Association of Texas was founded in 1986 to locate, restore, and protect prairies in Texas; the group currently protects about 2,780 acres (11.3 km2) of Texas prairies.[11]

The Midewin National Tallgrass Prairie, founded in 1996 near Elwood, Illinois, was as of 2006 the largest tallgrass prairie restoration area in the United States. In Minnesota, Glacial Ridge National Wildlife Refuge was established in 2004. The core of the refuge is a preserved 5,000-acre (20 km2) tallgrass prairie remnant, and an additional 30,000 acres (121 km2) are either in the process of restoration or will be soon. According to The Nature Conservancy, so far, 100 wetlands have been restored and 8,000 acres (32 km2) of land have been seeded with native plant species.[12]

See also[edit]

References[edit]

  1. ^ a b Pam Graham: “Tallgrass Prairie”ProQuest Discovery Guides http://www.csa.com/discoveryguides/discoveryguides-main.php Released November 2011.
  2. ^ "Microbes Beneath the Surface". Science Today: California Academy of Sciences. Retrieved 26 September 2014. 
  3. ^ a b "Central forest-grasslands transition". Terrestrial Ecoregions. World Wildlife Fund. 
  4. ^ a b Klinkenborg, Verlyn (April 2007). "Splendor of the Grass: The Prairie's Grip is Unbroken in the Flint Hills of Kansas". National Geographic. 
  5. ^ "Into the Wild: Indian Boundary Prairies". Chicago Wilderness Magazine. Fall 2008. Archived from the original on 14 April 2014. 
  6. ^ "Prairie Grasslands and Parkland". Environment Canada. 22 August 2008. Archived from the original on 27 May 2010. 
  7. ^ a b 1944-, Jordan, William R., III, (2011). Making nature whole : a history of ecological restoration. Lubick, George M., 1943-. Washington, DC: Island Press. ISBN 9781610910422. OCLC 750183084. 
  8. ^ 1913-1961., Curtis, John T. (John Thomas), (1971). The vegetation of Wisconsin : an ordination of plant communities. Madison: University of Wisconsin Press. ISBN 9780299019433. OCLC 811410421. 
  9. ^ 1939-, Court, Franklin E., (2012). Pioneers of ecological restoration : the people and legacy of the University of Wisconsin Arboretum. Madison: University of Wisconsin Press. ISBN 0299286630. OCLC 814694131. 
  10. ^ Madson, John (1982). Where the Sky Began: Land of the Tallgrass Prairie. Boston, Mass.: Houghton Mifflin Company. 
  11. ^ "Native Prairies Association of Texas". www.texasprairie.org. Retrieved 10 April 2018. 
  12. ^ "The Nature Conservancy - Glacial Ridge Project". Nature.org. Retrieved November 14, 2007. 

Further reading[edit]

  • Chapman, Kim Alan; Mary Kinsella Ziegenhagen; Heidi Fischer (1997). Valley of Grass: Tallgrass Prairie and Parkland of the Red River Valley Region. St. Cloud, Minnesota: North Star Press. 
  • Cushman, Ruth Carol. Peterson Field Guides: The North American Prairie (Peterson Guides)
  • Gruchow, Paul. Journal of a Prairie Year, University of Minnesota Press.
  • Least Heat-Moon, William. PrairyErth (A Deep Map): An Epic History of the Tallgrass Prairie Country
  • Manning, Richard. Grassland: The History, Biology, Politics and Promise of the American Prairie
  • Savage, Candace. Prairie: A Natural History
  • White, Matt. Prairie Time: A Blackland Portrait

External links[edit]