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... <br />:` <br />.-3- ~~ M204 Shallow Foothill MLRA 49 <br />c. If ecological retrogression is cattle-induced, plant such as <br />big bluestem, yellow Indiangrass, sideoats grema;.pw ntain <br />mutely, switchgrass, and Griffith wheatgrass will dec ease or <br />' disappear from the plant community. Many forbs and hrubs wiIS <br />increase. If retrogression is sheep induced mountaS mahogany <br />and many forbs wi1S decrease and many grasses will i crease. <br />With further deterioration, cheatgtass, Japanese bro e, and <br />other annuals Snvade the site. <br />d. Vegetation densityl/ is approximately 10 percent. <br />4. Annual Production <br />If the range is in excellent condition, the approximate oral annual <br />production (air-dryJ is: <br />favorable years 600 pounds/Ac 72 Xg/Ha <br />normal years 450 pounds/AC 4 K9/Ha <br />unfavorable years 300 pounds/Ac 36 Kg/Na <br />Of this production, 5 to 15 percent will likely be unpala able to <br />Livestock. <br />5. Soils <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 s ndy loam <br />to a loam. <br />Permeability is moderate. Available water capacity i Iow. <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 />Bernal sandy loam <br />Fortwirxlate Ioam <br />Id port Zoam <br />Penrose channery Zoam <br />Punnet fine sandy loam <br />Rizozo loam <br />Stroupe extremely stony Loam <br />Tarryall gravelly loam ' <br />1/ Vegetation density = basal area. This is the area of ground urface <br />i " covered by the perennial stem or stems. Usually, this is meas red one <br />inch (2.54 cm) above the soil in contrast to the full spread <br />perennial foliage. <br />