Author:
Bowman DMJS,Kirkpatrick JB
Abstract
Field and pot experiments were designed to test the relative roles of allelopathy, competition for
moisture and competition for nutrients in the suppression and growth of Eucalyptus delegatensis. In pot
experiments litter cover was associated with slightly slower growth rates than in other treatments. A
fertilization treatment was associated with increased growth rates in both trenched and untrenched
situations in a field experiment, but the effect of fertilization was subdued in comparison with the effects
of trenching or of total tree removal in the clear-felling treatment. Saplings and seedlings in the forest
were under significantly greater moisture stress, as indicated by xylem pressure potential and stomata1
resistance, than those growing in the adjacent clear-felled areas. Surface soils in clear-felled areas had
moisture contents above the level which caused seedling stress while surface soils within the forest were
often below this level. These findings suggest that adult trees suppress seedling and sapling regrowth
largely through their effect on soil moisture. However, another form of seedling growth suppression also
occurs in the open as a result of frost damage.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
43 articles.
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