Juniper-pinyon woodlands are the most common woodland or forest site found on BLM lands managed by the Salt Lake Field Office (SLFO). These woodlands are dominated by small, usually scattered, conifers. In the Great Basin, which is a large portion of the Salt Lake Field Office, Utah juniper (Juniperus osteosperma) occurs either alone or together with single needle pinyon (Pinus monohylla). Stands of trees comprised only of Utah juniper are more often found on lower elevation, drier sites.
Juniper-pinyon woodlands, due to the mid-elevation position, often become thermal belts in semi-arid precipitation zones. Average annual precipitation varies from 10 to 18 inches depending on the site. In some areas, trees have increased in density or have invaded adjacent areas typically dominated by other vegetation types. This increase in density and spread is due to a combination of factors, each of which has occurred simultaneously making it nearly impossible to determine if one causal factor is more important than the others. These woodlands have provided extensive areas for wildlife habitat, livestock grazing, recreation, and the harvest of wood products (fence posts, fire wood, and Christmas trees).
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