. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 16, No. 2 Aspen in Utah The most conspicuous deficiency in all of the foregoing studies lies in their failure to study the abiotic environment in detail. The soil studies of Lynch (1955) are not presented in a form suit- able for interpretation of the perfoniiance of in- dividual plant species. Likewise, a detailed study of the influence of topographic position on the behavior of aspen has never appeared in the lit- erature. Crovvther and Harper (1965) have studied the influence of parent material on a
. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 16, No. 2 Aspen in Utah The most conspicuous deficiency in all of the foregoing studies lies in their failure to study the abiotic environment in detail. The soil studies of Lynch (1955) are not presented in a form suit- able for interpretation of the perfoniiance of in- dividual plant species. Likewise, a detailed study of the influence of topographic position on the behavior of aspen has never appeared in the lit- erature. Crovvther and Harper (1965) have studied the influence of parent material on as- pen forest development in Utah, but the study was confined to a single watershed and a nar- row range of parent materials. A useful study by Jones (1967a) considers the influence of various combinations of climatic, topographic, and eda- phic characteristics on height growth of aspen stands in Colorado, New Mexico, and Arizona. Additional studies of this type are needed in other parts of the Mountain West. Disease appears to play a key role in the dy- namics of aspen forests in the West. Meinecke (1929), Mieike (1957), Hinds (1962), and Kre- bill (1971) discuss the major diseases attacking western aspen. The influence of ecological con- ditions on distribution and severity of impor- tant diseases is still largely unknown, however. Attempts to utilize understory species as in- dicators of site potential for either tree growth or herbage production as advocated by early ecologists (Korstian, 1917 and Riggs, 1929) have not usually been successful (Kittredge, 1938 and Driscoll, 1963). However, a few workers have used understory species as indicators of site po- tential for tree growth with success (Rowe, 1956; Gadnon and MacArthur, 1959; Hills and Pier- pont, 1960; Daubenmire, 1961; and Orloci, 1962), but methods employed have not usually been well quantified. METHODS In this study, an attempt is made to develop a simplified and completely quantitative ap- proach to the use of u
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