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<br />-3- lI06 ShnlZov Foothill MLRA d9 <br />c. It ecological retrogression Is eattlrinduced, pZa s such as <br />big bluestem, yelIoa Indiangrass, sideoats grams, untain <br />muhly, sritchgrass, and Griffith rheatgrass r111 d crease or <br />disappear from the plant community. Many forbs a shrubs ri11 <br />Increase. Lf retrogression Is sheep indured mount in mahogany <br />and many forbs rill decrease and many grasses rill Sncrease. <br />With further deterioration, cheatgrass, Japanese b ome, and <br />other annual: invade the site. <br />d. Vegetation density1/ is approximately 20 percent. <br />d. Annual Production <br />If the range is in esceZIent condition, the approsimae total annual <br />production (air~ry) isr <br />favorable years 600 pwnds/Ac 677 Xg/Ra <br />normal years ISO pounds/AC 504 Kg/Ma <br />unfavorable yeah 300 pounds/Ac 336 Xg/!fa <br />of this production, 5 to 15 percent r1ZZ ISke1y be unpa stable to <br />1 IvestorJc. <br />5. Soils <br />a. The Bolls of this site are shallot and tall drat They occur <br />on upland ridges and formed pr1mr12y from satrdsto •s and <br />Limestones. Surface testate can vary from a stoney sandy Loam <br />to a loam. <br />PsrmeablZity Ss aoderate. Available rater cap <br />Runotf is eeodarate to rapid and erosion can be <br />covet Is destroyed. <br />b. Major soils associated rith this site are: <br />soil Unit <br />Haller stony sandy loss <br />Bernal sandy loam <br />Portringate loam <br />Lport loss <br />harose chanrrery loam <br />Purrrer fins sandy Loam <br />Rizozo Loam <br />stroupe eztrraiely stony Loam <br />TarryaIl gravelly loam <br />is Zor. <br />•e if plant <br />2/ vegetation density ~ basal area. This is the area of grow surface <br />covered by the perennial stem or stems. Usually, this Is esured one <br />inch (?.54 cm) above the soil in rnntrast to the full sprea of <br />perennial faZiage. <br />