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<br />RANGE SITE No. 233 Page 3 <br />MOUNTAIN LOAM, 10-14" P.Z. <br />August 1975 <br />Tree species are not natural to the site. Approximate ground <br />cover is 25$. Species most likely to invade are annual fortis <br />(lambsquarter, Russian thistle, sunflower, etc.). These may <br />show up on areas in better condition in seasons of unusually <br />good moisture. Native species likely to invade or increase <br />from trace amounts are sleepygrass, ring and mat muhly, and <br />Colorado rubberweed. As the ecological condition deteriorates, <br />the dominant grasses give way to low-vigor blue grams and plants <br />of generally low grazing value, such as ring muhly, slimstem <br />muhly, three-awn, prickly pear, fringed sagebrush, snakeweed, <br />and especially rabbitbrush. Some areas become heavily infested <br />with yucca. <br />4. Total Annual Production <br />Favorable years 1000 Pounds per Acre Air Dry <br />Unfavorable years 400 " " " " " <br />Median years 750 " " " " <br />5. soils <br />a. Soils are loams and sandy loams, usually with stones, cobble, <br />or gravel on the surface and through the profile. They are <br />generally moderately deep to deep but may include some shallow <br />spots. Lime is commonly present but there is no strong lime <br />zone within one foot of [he surface. Soils permit fairly <br />ready intake of moisture and can store most of it that falls <br />in average years. Low Boll temperature during the early part <br />of [he short growing season and frequent lack of moisture when <br />temperature is optimum are the main limitations. <br />b. Soils in this site are: <br />Garber loam <br />Jarre loam <br />Kassler gravelly sandy loam <br />Pring sandy loam <br />Westcreek loam <br />J7HFRS H., J%TEKN/,~D <br />6. Rare, Threatened or Endangered Plants and Animals <br />The black-footed ferret may exist on this site because of the <br />natural prevalence of prairie dogs. <br />