. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Purshia tridentata/ Festuca idahoensis Ecosystem Physical Description Site. — This eocsystem occurs on the deer's transition range between the summer and winter ranges. It is characterized by gentle to rolling benchland which rims a portion of the Silver Lake Valley. Slopes range from 0 to 5 percent. Vegetation. — It is characterized by a dominant aspect of Purshia tridentata with Artemisia tridentata and A. arbuscula commonly occurring throughout the stand. Other shrub species oc
. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Purshia tridentata/ Festuca idahoensis Ecosystem Physical Description Site. — This eocsystem occurs on the deer's transition range between the summer and winter ranges. It is characterized by gentle to rolling benchland which rims a portion of the Silver Lake Valley. Slopes range from 0 to 5 percent. Vegetation. — It is characterized by a dominant aspect of Purshia tridentata with Artemisia tridentata and A. arbuscula commonly occurring throughout the stand. Other shrub species occurring consistently are Chrysothamnus viscidiflorus and C. nauseosus. There is an occasional Juniperus occidentalis and Cercocarpus ledifolius occurring in this ecosystem; however, composition, basal area, and crown cover data indicate that these species are of minor importance. The strong dominant in the grass layer is Festuca idahoensis. Poa sandbergii, Stipa thurberiana, Sitanion hystrix, and Agropyron spicatum are other grasses which occur consistently and prominently. Antennaria rosea, Erigeron sp., Astragalus purshii, and Arabis sp. are forbs which occur consistently throughout the stand. Others which are common but irregular are Eriophyllum lanatum and Crepis sp. Soil. — This is a well-drained, moderately deep loam. The A horizon averages 6 inches in depth and is slightly acid. The Bl is a stony clay loam, the B2 is a stony clay, and both are slightly acid. Stones in the solum average 35 percent by volume, and the zone of root concentration is 0 to 12 inches. Inclusion of approximately 10 percent of the shallow soil under the Purshia tridentata-Artemisia arbuscula/Stipa thurberiana ecosystem occurs here. Discussion Ecosystem. — This is the relatively narrow transition belt between the high desert steppe and the forest. Here variability is high, and it might seem that successful ecosystem definition would be unreasonable. How- ever, in unraveling vegetation, soil
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