. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Artemisia arbuscuia / Festuca idahoensis Ecosystem Physical Description Site. —This community is one of three dominated by Artemisia arbuscuia. All occur on rocky openings from the transition range through- out all but the highest parts of the summer range, from elevations of 4,700 to 6,500 feet. These openings vary in size from approximately 5 acres to extended plains over 1 mile across. Slopes are moderate, seldom exceeding 5 percent. Slope aspects are generally westerly but occ
. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Artemisia arbuscuia / Festuca idahoensis Ecosystem Physical Description Site. —This community is one of three dominated by Artemisia arbuscuia. All occur on rocky openings from the transition range through- out all but the highest parts of the summer range, from elevations of 4,700 to 6,500 feet. These openings vary in size from approximately 5 acres to extended plains over 1 mile across. Slopes are moderate, seldom exceeding 5 percent. Slope aspects are generally westerly but occasionally northerly, particularly in the transition range. Vegetation. — Three communities that commonly occur in varying combinations with the one being described here are (1) Artemisia arbuscuia/Koeleria cristata, (2) A. arbuscuia/Danthonia unispicata, which will be discussed later, and (3) Cercocarpus ledifolius/Festuca idaho- ensis-Agropyron spicatum, which has been described. The latter com- monly occurs around scab flat edges, between A. arbuscuia and conifer types. The first two and the one under discussion here are treeless com- munities characterized by a low-growing shrub and an understory of mixed herbaceous species. The only shrub recorded in any of the three is A. arbuscuia. In this ecosystem it averages 8 inches in height and 26 per- cent of the composition. There are fewer forbs here than in any other ecosystem sampled except the two Cercocarpus ledifolius ecosystems previously described. Lomatium triternatum is the most widely distributed perennial (86-percent frequency), and Eriophyllum lanatum has the largest share of the composition (3 percent). Annual forbs, as a group, occur more fre- quently than perennials. Soil. — This is a stony loam soil about 18 inches deep. Drainage, al- though not good, is less restricted than in the other Artemisia arbuscuia ecosystems. The A horizon is 6 to 7 inches deep, is a loam, and has a pH of The B horizon is 12 t
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