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I <br /> Northern San Isabel and Western Pike National Forests.Coloraao <br /> cf VEGETATION I <br /> .?, Potential natural communities: <br /> 'ap Unit: 790Y—Sphinx family, dry - Rock Sphinx: ponderosa pine/Arizona fescue <br /> outcrop complex,40 to 150 percent slopes. (PipolFearl) and ponderosa pine/kinnikinnick <br /> Ecological Land Unit: 790Y—ponderosa pine on (PipolAradl) and ponderosa pine/mountain- <br /> lower montane, dry, south facing canyons, hills, mahogany (Pipo/Cemo). <br /> and mountains. Seral stages: dominated by plants of the <br /> MAP UNIT SETTINGS respective potential natural communities. <br /> Present vegetation: dominated by plants of the <br /> Location: mountainous areas where granitic rocks respective potential natural communities. f <br /> predominate. USE AND MANAGEMENT CONSIDERATIONS <br /> Landform: canyons, hills, and mountains. <br /> Parent material: residuum. Major uses: wildlife habitat and watershed. l <br /> Geologic symbol: Yg. Yp, Xg. and YXg. Mass movement potential: <br /> Elevation range: 6,500 to 9,000 feet. Landslides: low. <br /> Aspect: south. Debris flows: moderate. , <br /> Climatic zone: lower montane, dry. Snow avalanche: moderate. <br /> Mean annual precipitation: 12 to 16 inches Sediment delivery efficiency: high. <br /> Mean annual air temperature: 40°F. to 48°F. Road and trail limitations: <br /> Average annual snowfall: 50 to 100 inches. Cut and fill slope stability <br /> COMPOSITION Sphinx: moderate- unconsolidated materials. <br /> Rock outcrop: moderate-cliffs. <br /> 55 percent Sphinx and similar soils. improved unsurfaced roads: <br /> 30 percent Rock outcrop. Sphinx: severe- slope. <br /> Contrasting inclusions Rock outcrop: severe- cliffs. <br /> 10 percent eroded soils on steep slopes. Offroad vehicle roads and trails: <br /> 5 percent deep soils on toeslopes Sphinx: severe-slope and severe erosion <br /> hazard. . <br /> TYPICAL PROFILES: Rock outcrop: severe-cliffs. <br /> Sphinx - Foot trails and paths: <br /> Surface layer(s): Sphinx: severe-slope and severe erosion <br /> 0 to 3 inches -yellowish brown, very gravelly hazard. <br /> coarse sandy loam. Rock outcrop: severe-cliffs. <br /> Subsurface layer(s): Revegetation considerations: Trees are slow to <br /> 3 to 12 inches -reddish yellow, extremely return after a disturbance. Planting drought <br /> gravelly loamy coarse sand. tolerant grasses and forbs have the best chance <br /> Weathered bedrock: of success. Mulch or similar treatment will protect <br /> 12 to 60 inches-soft granitic bedrock (grus). the soil from erosion, help conserve soil moisture. <br /> SOIL PROPERTIES AND QUALITIES and protect emerging plant seedlings. <br /> Timber management considerations: Limited by <br /> Sphinx slope, rock outcrop, severe erosion hazard, <br /> Effective rooting depth: less than 20 inches. windthrow hazard, low avaiiable water capacity, <br /> Drainage class: excessively. and south facing slopes. Plant trees that are <br /> Depth to seasonal high water table: greater drought tolerant or revegetate with grasses and <br /> than 6 feet. forbs. Trees to plant include ponderosa pine and <br /> Available water capacity: very low. Rocky Mountain juniper. <br /> Permeability: very rapid. Wildlife management considerations: This map !{ <br /> Runoff: rapid unit provides shelter and limited food during late <br /> Rock outcrop spring through fall months. Thinning or creating <br /> Landform: cliffs. small openings in the overstory canopy cover can <br /> Parent material: residuum. stimulate understory productivity. <br /> Rock type: granitic. Other management considerations: <br /> Runoff: rapid. Management activities are limited by slopes, rock <br /> outcrop, and severe erosion hazard. <br /> Page 131 DRAFT 4.27/95 <br />