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Silvicultural Value of Chemical Brush Control in the Management of Douglas-fir

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Abstract:

Retrospective analyses of three conifer sites in western Oregon and Washington were conducted to determine the long-term silvicultural impact and economic value of chemical brush control treatments performed 10 to 25 years earher. Comparisons between areas treated with phenoxy herbicides and untreated areas of the sites revealed significant differences in stocking and growth of Douglas-fir (Pseudotsuga menziesii). On two sites, invading red alder (Alnus rubra) virtually excluded conifers in the absence of brush control. On the untreated area of the third site, dense growth of varnishleaf ceanothus (Ceanothus velutinus var. laevigatus) reduced Douglas-fir stocking and diameter growth. On all three sites, projections of mature yield and economic returns based on current stand conditions indicated substantial benefits for areas where brush control treatments were applied. West. J. Appl. For. 1:69-73, July 1986.

Document Type: Journal Article

Affiliations: Corvallis, OR

Publication date: July 1, 1986

More about this publication?
  • 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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