Effects on crown development, branch shed and competition on wood defect in Eucalyptus regnans and E. sieberi
1986
Marks, G.C. | Incoll, W.D. | Long, I.R. (Victorian Dept. of Conservation Forests and Lands, Melbourne (Australia))
Early crown development and branch shed of Eucalyptus regnans was examined in both planted and naturally regenerated forests in the central highlands of Victoria, its native habitat. The effect of competition between E. sieberi, a eucalypt with some similarities to E. regnans and Acacia verniciflua was also studied in field plots on a very poor quality site in south Gippsland. The maximum ratio of tree height to crown depth of 2.5 at age 20, was obtained at planting densities of c. 6720 trees per ha. The incidence of decay and other defects increased with the diameter of the occluded branch, the relationship being expressed by a negative exponential curve. Competition between A. verniciflua and E. sieberi improved the latter's height growth, branch occlusion processes and height-crown depth ratio, while it reduced the crown depth and had no effect on the mean tree diameter 1.2 m above ground.
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