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~~ :. <br />' .-3- 11204 Shallow Foothill MLRA 49 <br />c. If ecological retrogression is cattle-induced, plants such as <br />big bIuestem, yellow Indiangrass, sideoats grama, mountain <br />muhly, switchgrass, and Griffith wheatgrass will decrease or <br />disappear from the plant community. Many forbs and shrubs will <br />increase. If retrogression is sheep induced mountain mahogany <br />and many forbs will decrease and many grasses will increase. <br />with further deterioration, cheatgrass, Japanese brome, and <br />other annuals invade the site. <br />d. Vegetation densityl/ is approximately !0 percent. <br />4. Annual Production <br />If the range is in excellent condition, the approximate total annual <br />production (air-dry) is: <br />favorable years <br />normal years <br />unfavorable years <br />600 pounds/Ac 672 Kg/Ha <br />450 pounds/AC 504 Kg/Ha <br />300 pounds/Ac 336 Kq/Ha <br />Of this production, 5 to 15 percent will likely be unpalatable to <br />livestock. <br />5. Soils <br />a. The soils of this site are shallow and well drained. They occur <br />„ -i on upland ridges and formed primarily from sandstones and <br />J limestones. Surface texture can vary From a stoney sandy loam <br />to a loam. <br />Permeability is moderate. Available water capacity is low. <br />Runoff is moderate to rapid and erosion can be severe if plant <br />cover is destroyed. <br />b. Major soils associated with this site ate: <br />Soil Unit <br />Baller stony sandy loam <br />Eernal sandy loam <br />Fortwingate loam <br />Laport loam <br />Penrose channery loam <br />Purner fine sandy loam <br />Rizozo loam <br />Stroupe extremely stony loam <br />TarryaIl gravelly loam <br />1/ Vegetation density = basal area. This is the area of ground surface <br />covered by the perennial stem or stems. Usually, this is measured one <br />~,~ inch (2.54 cm) above the soil in contrast to the full spread of <br />perennial foliage. <br />