. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Artemisia tridentata- Purshia tridentata/ Festuca idahoensis Ecosystem Physical Description Site. — This is a large ecosystem situated in the mule deer's summer- winter range transition belt just below the Pinus ponderosa and Cerco- carpus ledifolius forest edges at an elevation range from 4,500 to 4,700 feet. During the greater number of years, this ecosystem provides winter habitat for the deer. Slopes range from level benches to those of 15 per- cent and exposures may be east,
. Habitat characteristics of the Silver Lake Mule Deer Range. Botany Oregon Lake County Ecology; Mule deer Oregon. Artemisia tridentata- Purshia tridentata/ Festuca idahoensis Ecosystem Physical Description Site. — This is a large ecosystem situated in the mule deer's summer- winter range transition belt just below the Pinus ponderosa and Cerco- carpus ledifolius forest edges at an elevation range from 4,500 to 4,700 feet. During the greater number of years, this ecosystem provides winter habitat for the deer. Slopes range from level benches to those of 15 per- cent and exposures may be east, north, or west. Vegetation. — It is characterized by an aspect of Artemisia tridentata peppered with Purshia tridentata in a crown cover ratio of approximately 2 to 1. There is a small but consistent amount of Chrysothamnus viscidiflorus throughout the stand, and C. nauseosus and Tetradymia canescens occur only sporadically. Perennial grasses are dominated by Festuca idahoensis and Sitanion hystrix, with the annual Bromus tectorum having as high a place in com- position as either perennial. All three grasses occur with 100-percent fre- quency. Other important perennials in the grass layer which occur con- sistently are Carex rossii, Stipa occidentalism and Agropyron spicatum. Forbs are of relatively minor importance, occurring with less than 1-percent composition in total. The most consistently occurring perennials are Lupinus sp. and Astragalus sp. Soil. — The soil is a deep, well-drained sandy loam derived primarily from pumice. Fine pumice gravels are common in the upper 2 feet, and pumice gravels and stones up to 8 centimeters in diameter are common from 21 inches to 4 feet. There is some colluvium in the profile, with basalt gravels and stones common in the upper 12 inches. The A horizon has a sandy loam texture, a pH of to , and aver- ages 12 inches in depth. The AC horizon is also a sandy loam, has a pH of , and is 17 inches deep. The typical description
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