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Young-Growth Redwood Stands Respond Well to Various Thinning Intensities

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Three 45- to 50-yr-old redwood (Sequoia sempervirens) sawtimber stands spanning a substantial portion of the species' commercial range were thinned to three stocking levels. Treatments were low thinnings leaving 25%, 50%, 75%, and 100% of the before-treatment stand density, expressed as basal area/ac. Trees were measured for dbh, and a sampling of heights was taken for volume estimations at 0, 5, 10, and 15 yr after thinning. Leave trees responded strongly to the increased growing space, in spite of the vigorous stump sprouting of cut trees. Stand growth in basal area and volume varied narrowly among treatments. Overall, volume production was significantly different only in the 25% leave plots where sites were not fully occupied by the leave trees. Results illustrate the similarity between two growth/growing stock theories which appear to conflict. We conclude that 50% of the basal area in fully stocked stands could be removed in a low thinning without significant loss in volume production. West. J. Appl. For. 9(4):106-112.

Document Type: Journal Article

Affiliations: Pacific Southwest Research Station, USDA Forest Service, Arcata CA 95521 (retired)

Publication date: October 1, 1994

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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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