. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Pinus ponderosa I Purshia tridentata/ Festuca idahoensis Ecosystem: Festuca idahoensis Phase Physical Description Site. — This ecosystem has the same gross site characteristics as the Pinus ponderosa/Purshia tridentata /Festuca idahoensis ecosystem which we will name the parent ecosystem. Vegetation. — The vegetation is similar to that in the parent ecosystem, differing primarily in amounts of Purshia tridentata and Festuca idaho- ensis. The understory aspect is grass rather than
. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Pinus ponderosa I Purshia tridentata/ Festuca idahoensis Ecosystem: Festuca idahoensis Phase Physical Description Site. — This ecosystem has the same gross site characteristics as the Pinus ponderosa/Purshia tridentata /Festuca idahoensis ecosystem which we will name the parent ecosystem. Vegetation. — The vegetation is similar to that in the parent ecosystem, differing primarily in amounts of Purshia tridentata and Festuca idaho- ensis. The understory aspect is grass rather than shrub. Pinus ponderosa has a crown cover of 53 percent, compared with 60 percent in the parent. This species has 100-percent frequency of occurrence. P. tridentata has a composition of percent and a frequency of 100 percent. The only other shrub occurring on sample plots was Haplopappus bloomeri. F. idahoensis is the dominant grass, having 62-percent composition and 100-percent frequency. Carex rossii, Stipa occidentalism Sitanion hystrix, Poa nervosa, and Bromus carinatus are all common components of the un- derstory. There are four forbs which occur with 100-percent frequency, Lupinus caudatus, Microsteris gracilis, Fragaria virginiana, and Hieracium cyno- glossoides. Soil. — This is a well-drained, moderately deep loam. It varies from a loam in the A horizon to clay loam in the B2. The A horizon averages 10 inches deep and the B averages 24 inches. The B2Dr horizon is a clay mixed with weathered basalt fragments. The zone of root concentration is 0 to 19 inches. Large basalt boulders may be present in the solum and may be visible on the surface. Discussion Ecosystem. — There is no readily apparent answer to the scarcity of Purshia tridentata in this phase of the community. The soil moisture- holding capacity appears, due to a textural difference, to be slightly less here than in the parent ecosystem. Here the A horizon is a loam and the B. 15. Please note that th
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