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2.04.9 <br />increase, and undesirable weeds and annual plants invade and become <br />more abundant. <br />This soil is used for winter range by mule deer and elk. Some important <br />plant species which can be managed for optimum production are bitterbrush, <br />mountain mahogany, Gambel oak, serviceberry, and elk sedge. Berry- <br />producing shrubs are an important habitat element for black bear. This soil <br />provides habitat for Merriam turkey, blue grouse, and band - tailed pigeon. In <br />favorite years mature Gambel oaks produce acorns which are used by <br />Merriam turkey. <br />33 — Delson stony loam, 3 to 20 percent slopes. <br />This is a deep, well drained soil. It formed in stony alluvium and is on fans <br />and mesas. Elevation ranges from 6,800 to 8,400 feet. Average annual <br />precipitation is about 17 inches, average annual air temperature is about 44 <br />degrees F, and the average frost -free season is about 100 days. <br />Permeability is slow, and available water capacity is high. Effective rooting <br />depth is 60 inches or more. Surface runoff is medium to rapid. The hazard <br />of erosion from wind is slight and from water is moderate. <br />Included with this mapping area are a few small areas of Cerro, Agua Fria, <br />and Cochetopa soils. In some areas the soil is relatively free of stones or <br />has a surface layer of clay loam. <br />The native vegetation on this soil consist mainly of Gambel oak, serviceberry, <br />big sagebrush, and adapted grasses. <br />Most areas of this soil are in range and are used for limited grazing of <br />livestock and wildlife and for recreational purposes. <br />Because of surface stoniness and slope, this soil is unsuited to crops. <br />Seedbed preparation and drilling of seed for pasture plantings on depleted <br />native range or in cleared areas are generally not practical because of <br />PR -14 2.04-93- 03/14 <br />