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Impact of Pruning Intensity on Tree Growth and Closure of Pruning Wounds of Pinus strobus L. and Acer palmatum Thunb.  

Lee, Kyu Hwa (Department of Forest Sciences, Seoul National University)
Lee, Kyung Joon (Department of Forest Sciences, Seoul National University)
Publication Information
Journal of Korean Society of Forest Science / v.98, no.5, 2009 , pp. 584-592 More about this Journal
Abstract
The objective of this study was to examine the impact of pruning intensity on the vigor and cambial growth of the treated trees, and on the closure of pruning wounds for one year after pruning treatment. Two tree species, Pinus strobus and Acer palmatum, planted broadly in the urban forest of Korea were selected for the experiment. Intensity of pruning, which was estimated by proportion of removed branches, was categorized into five levels with about 10% intervals from lowest 8% up to 46%. Following parameters were examined; cambial electrical resistance (CER) and the cambial growth of trunk at 30 cm above the ground for the years before and after pruning, the cambial growth of stem at 1.5 cm above the branch bark ridge (BBR) of the pruned branch, and closure of pruning wound for one year after pruning. Tree vigor inferred from CER had a tendency to be weakened as pruning intensity increased in P. strobus, while that of A. palmatum was not affected. The trunk growth decreased significantly when the pruning intensity was higher than 30% in both species. The closure of individual pruning wound was related more to the cambial growth of stem at 1.5 cm above BBR than to the pruning intensity. Comparing the closure rate of pruning wound for one year, P. strobus with 72.1% was faster than A. palmatum with 39.3%, which corresponded with the rate of cambial growth of the two species.
Keywords
tree vigor; cambial electrical resistance; tree growth; branch bark ridge; closure of wound; cambial growth;
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