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Assessment of Wounding at Two Commercially Thinned Jack Pine Sites

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The long-term effect of thinning on extent of aboveground wounding and effect of wounding on dbhob growth at two commercially thinned jack pine sites near Chapleau, Ontario, was studied. Conventional shortwood logging was used to strip-thin the Nimitz site in 1970. The Dupuis site was strip-thinned in 1973 with a Timberjack RW-30 tree-length harvester. The proportions of trees with wounds were significantly higher (P < 0.01) in the thinned areas: Nimitz thinned, 13.9%; Nimitz unthinned, 3.6%; Dupuis thinned, 18 7%; and Dupuis unthinned, 7.5%. The logging system employed did not appear to affect overall wounding; however, there were significantly (P < 0.05) more deep wounds in the conventional shortwood thinned area. The differences between dbhob of wounded and nonwounded trees in thinned and unthinned areas at the Nimitz and Dupuis sites were contradictory and statistically insignificant. Wounding may be more important as an infection court for fungi than for its effect on overall diameter growth. The extent of wounding emphasizes the need for good planning and control, and the use of highly skilled workers. North. J. Appl. For. 9(2):43-46.
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Document Type: Journal Article

Affiliations: Lakehead University, School of Forestry, Thunder Bay, Ontario, Canada P7B-5E1

Publication date: 1992-06-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.
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