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<br />Fremont County Area, Colorado <br />juniper and an understory of blue grama, Indian <br />ricegrass, mountain muhly, and Gambet oak. If the <br />condition of the understory deteriorates, red threeawn, <br />blue grama, pricklypear, and yucca increase. The <br />potential production of native understory vegetation in <br />normal years is about 400 pounds of air-dry vegetation <br />per acre. <br />Woodland products, such as firewood, fence posts, <br />Christmas trees, and pinyon nuts, are produced in <br />areas of this soil. In some areas, however, the slope <br />Limits access to these products. The use of tree spades <br />for removal of transplants is severely limited by the <br />depth to bedrock and the high conten! of rock <br />fragments. The site index for pinyon-juniper ranges <br />mainly from 40 to 60. <br />Thinning the overstory generally enhances <br />reproduction and promotes the growth of grass and <br />younger trees. After pinyon and juniper are thinned or <br />harvested, seeding grasses reduces the hazard of <br />erosion and increases grass production. Deferring <br />grazing in harvested areas for at least 2 years ensures <br />the development of a plant cover that is sufficient to <br />protect the soil from erosion. <br />This soil is poorly suited to homesite development. <br />The main limitations are the slope and the depth to <br />bedrock. <br />The capability classification is Vlle, nonirrigated. The <br />soil is in the Pinyon-Juniper woodland site. <br />8-Boyle-Martinsdale complex, 3 to 20 percent <br />slopes. These soils are in intermontane basins. The <br />native vegetation is mainly pinyon and grasses. <br />Elevation is 7,200 to 8,500 leet. The average annual <br />precipitation is 14 to 16 inches, the average annual air <br />temperature is 43 to 45 degrees F, and the average <br />Irost•free period is 85 to 110 days. <br />This unit is about 45 percent Boyle soil and 40 <br />percent Martinsdale soil. The Boyle soil is mainly on <br />hills and ridges. It supports standing or chained pinyon <br />and juniper. The Martinsdale soil is mainly on concave <br />landtorms in grassed areas. <br />Included in mapping are areas of soils that are <br />similar to the Martinsdale soil but are moderately deep. <br />These soils are on the upper side slopes of swales. <br />They make up about 10 percent of the unit. Also <br />included are areas of gneiss or granite rock outcrop on <br />hills and ridges. These areas make up about 5 percent <br />of the unit. <br />The Boyle soil is shallow and well drained. It formed <br />in residuum derived dominantly from gneiss and granite. <br />Slopes range from 5 to 20 percent. The surtace layer is <br />typically very dark grayish brown very gravelly sandy <br />loam about 6 inches thick. The subsoil is extremely <br />gravelly sandy clay loam about 11 inches thick. Sof[ <br />N~ <br />2a <br />granite is at a depth of about 17 inches. The soil is <br />neutral. <br />Permeability is moderate in the Boyfe soil. Available <br />water capacity is very low. Effective rooting depth is 10 <br />to 20 inches. Runoff is rapid or very rapid, and the <br />hazard of water erosion is high or very high. <br />The Martinsdale soil is deep and well drained. It <br />formed in alluvium derived dominantly from gneiss and <br />granite. Slopes range from 3 to 8 percent. The surface <br />layer is typically dark brown sandy loam about 5 inches <br />thick. The subsoil is sandy clay loam about 40 inches <br />thick. The lower 24 inches of the subsoil has a high <br />content of accumulated calcium carbonate. The <br />substratum to a depth of 60 inches or more is gravelly <br />sandy loam. The soil is neutral fo a depth of 11 inches <br />and is moderately alkaline below that depth. <br />Permeability is moderately slow in the Martinsdale <br />soil. Available water capacity is high. Effective rooting <br />depth is 60 inches or more. Runoff is medium or rapid, <br />and the hazard of water erosion is moderate or high. <br />This unit is used as rangeland. <br />The potential plant community on the Boyle soil is <br />mainly pinyon and juniper and an understory of blue <br />grarae, Indian ricegrass, mountain muhly, and Gambet <br />oak. The potential plant community on the Martinsdale <br />soil is mainly western wheaigrass, needle~ndthread, <br />blue„gama, and cringed sagewort. The average annual <br />production of air-dry vegetation is about 400 pounds per <br />acre on the Boyle soil and 800 pounds per acre on the <br />Martinsdale soil. IF the condition of the range <br />deteriorates, blue grama, ring muhly, bottlebrush <br />squirreltail, rabbitbrush, and sleepygrass increase. <br />Range seeding is suitable if the range is in poor <br />condition. <br />Some areas that are covered with pinyon and juniper <br />are poorly suited to homesite development. The main <br />limitation is the depth to bedrock. Other areas of the <br />unit are well suited to this use. <br />The capability classification is Vle, nonirrigated. The <br />soils are about 50 percent in the Pinyon-Juniper <br />woodland site and 50 percent in the Mountain Loam, <br />13- to t8•inch precipitation zone #226 range site. <br />9-Boyle-Rock outcrop complex, 40 to 60 percent <br />slopes. This map unit is on mountainsides. The native <br />vegetation is mainly pinyon and juniper. Elevation is <br />7,500 to 8,500 feet. The average annual precipitation is <br />14 to 18 inches, the average annual air temperature is <br />43 to 46 degrees F, and the average frost-free period is <br />85 to 110 days. <br />This unit is about 60 percent Boyle soil and 25 <br />percent Rock outcrop. Rock outcrop occurs mainly on <br />the upper part of side slopes and ridges. <br />Included in mapping are areas of Bronell soils on foot <br />