Geoscience Reference
In-Depth Information
Fig. 10.10. (above) Douglas-fir is the most common tree on
north slopes at lower elevations in the Greater Yellowstone
ecosystem. the south slopes are generally too dry for trees
but support a mixed foothill shrubland with bluebunch
wheatgrass, big sagebrush, Saskatoon serviceberry, and other
plants. Mountain big sagebrush dominates the shrublands
in the foreground. Photo taken looking west toward Hoback
Junction.
Fig. 10.11. (left) Saskatoon serviceberry, antelope bitterbrush,
rabbitbrush, and mountain big sagebrush dominate this mixed
foothill shrubland in the Sierra Madre. Aspen grows in the
ravine. elevation 8,100 feet. Photo by Ken Driese.
which is found to the west and south . 33 Both species
are deciduous, capable of root sprouting, and are impor-
tant browse plants for deer and elk. At lower elevations,
where the frost-free period is longer, skunkbush sumac
is common, especially on the east side of the Bighorn
and Laramie mountains.
the relatively moist environment of the foot-
hills allows for greater plant cover, which enhances
the probability of fires, whether caused by lightning
or humans. Periodic fires in some areas prevent the
growth of juniper and other conifers. temporary shifts
 
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