Abstract
1 Central headquarters maintained in cooperation with CoZorado State University at Fort Collins. Author stationed at Tucson, Arizona, in cooperation with the University of Arizona. world (Humphrey, 1958; Weaver and Clements, 1938). Thornber (1910) observed that several semidesert shrubs were killed by fire in southern Arizona. More recently, Humphrey (1949), Humphrey and Everson (1951), and Reynolds and Bohning (1956) have reported on the effects of fires in killing semidesert shrubs. The effects of burning on associated annual and perennial grasses have received less attention. The present studies consisted of measuring changes in grass and shrub cover after burning and reburning to determine (1) the effectiveness of planned burning for shrub control, and (2) the direct and indirect effects of burning on perennial grasses. The study period, 1952-1965, included several years with precipitation above average and several years with precipitation below average.
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