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. '. <br /> <br />-3- .11204 Shallow Foothill MLRA 49 <br />c. If ecological retrogression is cattle-induced, plants such as <br />big bluestem, yellow Indiangrass, sideoats grama, mountain <br />mutely, 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 wiII increase. <br />With further deterioration, cheatgrass, Japanese brome, and <br />other a nnuaIs invade the site. <br />d. Vegetation densityl/ is approximately 10 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 600 pounds/Ac 6T2 Kg/Na <br />normal years 450 pounds/Ac 504 Kq/Ha <br />unfavorable years 300 pounds/Ac 336 Kg/Ha <br />Of this production, 5 to 15 percent will likely be unpalatable to <br />livestock. <br />5. Soil s <br />a. The soils of this site are shallow and well drained. They occur <br />on upland ridges and formed primarily from sandstones and <br />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 are: <br />Soil Unit <br />Bailer stony sandy loam <br />Bexna3 sandy Loam <br />Fortwingate loam <br />Laport Loam <br />Penrose channery Ioam <br />Purner fine sandy loam <br />Rizozo loam <br />Stroupe extremely stony loam <br />Tarryall gravelly Ioam <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 />~' 3 <br />