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Rangeland Assessment and Monitoring Committee

Oklahoma Set - Oklahoma Loamy Prairie Ecological Site
OK-1.  This "tall grass" plant community is dominated by tall and mid grasses.  Little bluestem, sand bluestem, switchbrass and Indian grass are the dominant species.  A mixture of legumes and forbs, catclaw sensitivebrier, Illinois bundleflower, Engleman daisy, Missouri goldenrod and black sampson are present in this community.  there is an understory of blue grama, sideoats grama, and buffalograss.  this site is stable, the soil is protected and it is above the SCT.
OK-2.  The "little bluestem" plant community is dominated primarily by little bluestem and sideoats grama.  Blue grama and buffalograss comprise a significant portion of the understory.  Forb population includes scarlet globemallow, heath aster and wild alfalfa, among others.  The soil is protected by adequate ground cover and this community is above the SCT.
OK-3.  The "little bluestem-ceder" plant community is similar to that described in Figure OK-2.  The significant differences is that eastern red cedat has invaded this community and now covers approximately 10 to 15% of the site.  Small cedar seedlings indicate that this infestation will increase rapidly.  This site is stable, the soil is protected, and it remains about the SCT.
OK-4.  This is a "reestablished native rangeland" plant community on previously farmed Woodward soil.  Codominates are little bluestern and sideoats grama.  Sand bluestem, Indian grass and switchgrass are also present as well as an understory of blue grama.  Principle forbs are western ragweed, heath aster, and scarlet globe mallow.  The Woodward soil is somewhat sshallow because of past erosion.  Presently the site is stable, the soil is protected, and it is above the SCT.
OK-5.  This "blue grama" plant community is similar to Figure OK-4.  Blue grama dominates the community with sideoats, silver bluestem and annual brome as a smaller component of the vegetation.  Western ragweed and common broomweed are common forbs present.  Ground cover remains adequate to prevent erosion and the community is above the SCT.
OK-6.  The monoculture on this "introduced grass" site is an Old World bluestem (Bothriochloa ischaemum).  this Woodward soil suffered some erosiion while farmed, but remains identifiable as such.  The stand of improved grass, however, adequately protects the soil and this "community" is above the SCT.
OK-7.  This loamy prairie ecological site has a St. Paul soil  The "blue grama-forb" plant community is dominated by blue grama and western ragweed.  Sideoats grama dominates the down slope area.  Other grasses found include buffalograss, hairy grama and annual brome. Typical forbs are heath aster, groundcherry, and wild alfalfa.  This site is not stable and accelerated erosion occurs.  The blue grama on the upslopes protects the soil to some degree, but rapid movement of water across the "slick upper portion brings excess water to the lower slopes causing sloughing of the soil and accelerated erosion where sideoats grama dominates.  Consequently, this community is below the SCT.
OK-8.  This field, planted to annual wheat, consists of a Woodward soil.  If conservation compliance measures are fully met, this soil is protected and it could be replanted to a plant community similar to the original.  At present, the wheat plant is heavily grazed and if this were to continue, both wind and water erosion could be significant.  Depending on management, this may or may not be protected.
Photographs were taken by James H. Shearhart
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