Although pinyon-juniper woodland is common throughout most of Utah, it is less so in Utah and Salt Lake valleys. Even so, stands do occur in the valleys and are known to have been there since presettlement times. Three such stands occurring along the eastern sections of the valleys have shown major decreases in area since settlement times, and one has all but disappeared. Their disappearance is attributed to early use for fuel, agricultural, and urbanization purposes.
Christensen, E. M. and Brotherson, J. D.
"Decreases of juniper woodland in the Utah and Salt Lake valleys since settlement,"
Great Basin Naturalist: Vol. 39
, Article 9.
Available at: http://scholarsarchive.byu.edu/gbn/vol39/iss3/9