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Fire and Changes in Creosote Bush Scrub of the Western Sonoran Desert, California
David E. Brown and Richard A. Minnich
The American Midland Naturalist
Vol. 116, No. 2 (Oct., 1986), pp. 411-422
Published by: The University of Notre Dame
Stable URL: http://www.jstor.org/stable/2425750
Page Count: 12
You can always find the topics here!Topics: Shrubs, Deserts, Seedlings, Growing seasons, Sprouting, Vegetation, Ambrosia, Species, Plants, Precipitation
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Seven years of above normal precipitation between 1976 and 1983 encouraged heavy growth of native annuals and exotic grasses in the western Sonoran Desert. Unprecedented fires in creosote bush scrub started mostly after 1978. Analysis of several burns near Palm Springs revealed that most shrubs, including Larrrea tridentata, Ambrosia dumosa and Opuntia spp., are poorly adapted to relatively low intensity fires as evidenced by limited sprouting and reproduction. These shrubs were replaced by open stands of Encelia farinosa, native ephemerals, and European exotics, mostly Bromus rubens and Schismus barbatus. The rapid selective thinning of creosote bush scrub species suggests that the modern biogeography of this ecosystem may be controlled, in part, by recurrent burning.
The American Midland Naturalist © 1986 The University of Notre Dame