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Responses of Red Alder to Thinning

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Responses of red alder (Alnus rubra Bong.) to thinning were observed at two sites in the Oregon Coast Range. Five years after thinning in the 20-yr-old stand, mortality was observed only in control plots. Diameter growth of crop trees increased up to 54% with thinning. Trends toward less height growth at wider spacings and increased growth in basal area compared to controls appeared to be developing in thinned plots. Ten years after thinning in the 14-yr-old stand, the problems of flashback seen at year 5 in the chemically thinned plots had largely been overcome. Reduction in height growth in all thinned plots had been overcome. Net basal area growth was up to 60% greater in thinned treatments. Thinning appears effective for 10 to 15 yr in the narrow spacings and 15 to 20 yr in the wide spacings. West. J. Appl. For. 10(1): 17-23.

Document Type: Journal Article

Affiliations: Clackamas County Extension, 200 Warner-Milne Road, Oregon City, OR 97045

Publication date: 1995-01-01

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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 Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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