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1 <br /> <br />• <br />-3- N204 Shallow Foothill MLRA 49 <br />c. If ecological retrogression is cattle-induced, plants such a s <br />big bluestem, yellow Indiangrass, sideoats grama, mountain <br />mutely, switchgrass, and Griffith wheatgrass wi11 decrease or <br />disappear from the plant community. Many fortis and shrubs will <br />increase. If retrogression is sheep induced mountain mahogany <br />and many fortis 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 10 percent. <br />4. Annual Production <br />If t:he range is in excellent condition, the approximate total annual <br />production (air-dry) is: <br />favorable years 600 pounds/Ac 672 Kg/Ha <br />normal years 450 pounds/Ac 504 Kg/Na <br />unfavorable years 300 pounds/Ac 336 Kg/Ha <br />Of this production, 5 to 15 percent wi11 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 />Ba11er stony sandy loam <br />Bernal sandy Loam <br />Fortwingate loam <br />Laport Loam <br />Penrose channery Loam <br />Purner fine sandy 1oa m <br />Rizozo loam <br />Stroupe extremely stony loam <br />Tarryall gravelly Loam <br />1/ Vegetat.ion 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„59 cmJ above the soil in contrast to the fu11 spread of <br />perennial foliage. <br />~' 3 <br />