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In the Arb, there are a few remnant prairie species along the Cannon River bluffs in the northeast corner of the Arb and along the railroad tracks near Waterford, but the best original prairie fragment is Postage Stamp Prairie in the Upper Arb ( G4 ). And while not technically in the Arb, McKnight Prairie is the largest and most intact native prairie remnant owned by Carleton.
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Arb and there
: A large block of upland forest is taking shape in the northeast portion of the Lower Arb, and eventually there will be about 180 acres ( 73 hectares ) of contiguous forest in that area alone.
Arb and are
Pedestrian trails are located throughout the Arb, as well as the school's cross-country running and skiing courses, and a paved mixed-use bicycle / running trail in the Upper Arb.
In addition, complex hand signals ( called Arb ) are used.
The medieval ethnonyms Arbanitai and Arbanios and the corresponding modern ethnonyms Arvanite, Arber, and Arbëreshë are considered by many linguists to have the same etymology as Albania, being derived from the stem Alb-by way of a rhotacism, Alb-→ Arb -.
Small populations of two rare turtles are found in the Arb: wood turtles ( Clemmys insculpta, a threatened species in Minnesota ) and Blanding ’ s turtles ( Emydoidea blandingii, a species of special concern ).
There are occasionally organized athletic events in the Arb, and both Carleton and St. Olaf as well as Northfield public school teams use the Arb as a training facility for cross-country running and skiing.
In restoring the Arb to its former state, these trees and plants are used as clues in identifying what species grew and reproduced in a given area.
Listed below are links to the management plans and natural history for each habitat found within the Arb.
: There are upland forests scattered throughout the Upper and Lower Arb.
Only offspring of trees from the local area are planted in the Arb, to maintain genetic similarity to nearby forests.
: Large areas of tallgrass prairie are being restored in the Arb.
New areas of prairie now are being planted annually in the Lower Arb, and the development of the prairie community is the subject of ongoing research by Carleton faculty and students.
There are other potential savanna restoration sites scattered through the Upper Arb.
Invasion by purple loosestrife ( Lythrum salicaria ) is a serious threat to the Arb ’ s wetlands, but so far they are relatively free of this aggressive introduced species.
In keeping with the overall goal of restoring native communities in the Arb, no new conifer plantations are planned.
: Several areas in the Arb are planted monocultures of perennial grasses, particularly brome ( Bromus inermis ) and switchgrass ( Panicum virgatum ).
The largest areas are the old fields in the Upper Arb along Spring Creek Road and a Lower Arb field near Highway 19.
Arb and remnant
: While not technically in the Arb, McKnight Prairie is the most intact native prairie remnant owned by the College.
Arb and prairie
The Carleton Arb is located on a natural border between prairie and forest habitat.
: Though large parts of the Arb were prairie at the time of European settlement, almost all of the prairie has been lost completely.
: The first prairie restoration in the Arb was begun at Hillside Prairie ( F10, G10-11 ) in 1978.
There ultimately will be about 140 acres ( 57 hectares ) of restored prairie in this area of the Lower Arb.
: In the Upper Arb, prairie restoration to date has been focused around Postage Stamp Prairie.
: Fire is essential to managing both prairie and oak savanna, so the main oak savanna restoration will be immediately adjacent to the large prairie restoration in the Lower Arb.
Arb and species
: The Arb has been a State Game Refuge for decades, and it serves a valuable role in providing habitat for species of diverse natural communities.
Two threatened plant species were discovered in the Arb in the 1990s: ovate-leaved skullcap ( Scutellaria ovata ) and kitten-tails ( Besseya bullii ).
As a result of this old demarcation, the species found throughout different sections of the Arb today serve as reminders of these old communities.
This can be seen today by the presence of many old ( over a century ) bur oaks ( Quercus macrocarpa ) in the Arb forests, now overgrown by fire-intolerant species.
:: The Cannon River flows the length of the Lower Arb, and is home to a number of rare species including wood turtles ( Clemmys insculpta ) and several types of mussel.
Other conifers will be allowed to remain since they provide habitat for some species, particularly in the winter, and increase the diversity of the Arb landscape.
Arb and Cannon
The Arboretum is divided by Minnesota Highway 19 into the larger Lower Arb to the north ( so called because it includes the Cannon River valley ) and the smaller Upper Arb.
The Arb is divided by Highway 19 into the Upper Arb ( south of the highway ) and the Lower Arb ( north of the highway ; " lower " because it contains the low-lying floodplain of the Cannon River ).
: The Cannon River flows through the Lower Arb, and its floodplain supports a distinctive biological community.
Once back in forest cover, the Arb ’ s floodplains will help in the management of Cannon River flooding by acting as a buffer to rapid changes in water level and by holding the soil during flood periods.
: Records from the presettlement General Land Survey of Rice and Dakota Counties show that the southeastern banks of the Cannon River in the Arb historically were oak savanna.
:: Oxbow Pond is a naturally occurring pond in the Lower Arb that was created by a change in course of the Cannon that left part of the river channel separated from the new course.
Arb and northeast
) and other conifers were planted in the northeast section of the Lower Arb.
Arb and corner
There will be an additional area of at least 50 acres ( 20 hectares ) of upland forest in the southeast corner of the Upper Arb.
Arb and near
: Smaller oak savannas will be restored near prairies in the Upper Arb.
Arb and original
: Because the original oaks still remain, the Arb offers a unique opportunity to reconstruct this extremely rare ecological community.
The Arb savannas will be kept open by trying to approximate the original fire regime.
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