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(30 to 40 feet in height) with a sparse shrub understory and thicker herbaceous <br />• stratum. Shrubs occurring most often in this variant are snowberry and choke- <br />cherry. Grasses and forbs are approximately evenly split and form as much as 50 <br />to 75 percent cover in the understory. The overstory of aspen may contribute as <br />much as 80 to 90 percent cover. <br />The second variant is predominantly a Mountain Shrub 1 type with an aspen <br />overstory of 25 to 75 percent. The trees in this variant range from 15 to 30 <br />feet tall. <br />Potential available productivity in this type is estimated to range from <br />500 to 1000 pounds per acre with an average near 800 pounds per acre. Much of <br />the total productivity in this type occurs in the aspen foliage which is not <br />readily available for livestock or wildlife consumption. <br />• The Douglas fir community is found on steep, north-facing slopes usually in <br />conjunction with aspen. It occupies approximately 5 percent of the area. Soils <br />are generally the same as found with aspen. <br />This community is dominated by Douglas fir (Pseudotsuga menziesii) with <br />occasional subdominants of aspen or Mountain Shrub 1 types. The understory is <br />sparse and poorly developed, primarily due to the shading by a nearly 100 per- <br />cent overstory canopy. Where an understory has developed, it may reach as much <br />as 30 to 50 percent cover. Species composing this understory include rose (Rosa <br />sp.), serviceberry, bluegrasses, Indian ricegrass, and a few of the smaller low <br />growing forbs. <br />Potential available productivity in this type is very low ranging from 100 <br />to 500 pounds per acre. <br />- 128 - (Rev. 5/86) <br />