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<br /> <br /> <br />-3- N204 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 will increase. <br />With further deterioration, cheatgrass, Japanese brome, and <br />other annuals invade the site. <br />d. Vegetation density1/ 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 <br />normal years <br />unfavorable years <br />Of this production, <br />livestock. <br />5 . Soil s <br />600 pounds/AC 672 Kg/Ra <br />450 pounds/AC 504 Kg/Ha <br />300 pounds/AC 336 Kg/Ba <br />5 to 15 percent will likely be unpalatable to <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 Zoam. <br />Permeability is moderate. Available water capacity is low. <br />Runoff is moderate to rapid and erosion can be severe if plant <br />covet is destroyed. <br />b. Major soils associated with this site are: <br />Soil Unit <br />Bailer stony sandy loam <br />Bernal sandy loam <br />Fortwingate loam <br />Laport Loam <br />Penrose channery Loam <br />Pu rnet fine sandy Zoam <br />Rizozo Loam <br />Stroupe extremely stony Loam <br />Tarryall 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 fu21 spread of <br />perennial foliage. <br />