Vegetal composition was determined during 1974 and 1984 using 60 permanent 50 m2 plots within a mature pinyon-juniper community in northeastern Utah. Results indicated that not only was there little significant change in community composition, but with many species frequency and density remained nearly the same during the decade.
Austin, Dennis D.
"Plant community changes within a mature pinyon-juniper woodland,"
Great Basin Naturalist: Vol. 47
, Article 8.
Available at: http://scholarsarchive.byu.edu/gbn/vol47/iss1/8