Low thinning and crown thinning of two severities as restoration tools at Redwood National Park

General Technical Report PSW-GTR-258
By: , and 



Interest in the restoration of second-growth forests has continued to increase in the redwood region, which has further increased the importance of evaluating restoration-based silvicultural strategies. This study assessed the short-term effectiveness of four silvicultural treatments (two silvicultural thinning methods, low thinning and crown thinning, and two basal area retentions, 80 percent and 45 percent) as forest restoration tools via analysis of relative basal area growth at Redwood National Park. Prior to treatment, the second-growth stand had more than 1,600 trees ha-1 and 70.0 m2 ha-1 basal area and consisted primarily of two species, Douglas-fir (Pseudotsuga menziesii(Mirb.) Franco) (the dominant species) and redwood (Sequoia sempervirens (D. Don) Endl.). Growth was enhanced for all treatments with 5-year net basal area gains of 28.4 percent for the lowretention crown thinning, 28.1 percent for the low-retention low thinning, 23.3 percent for the high-retention crown thinning, 19.1 percent for high-retention low thinning, and only 14.2 percent for the control. We conclude that all four thinning treatments improved tree growth; but among them, the low-retention treatments were most effective in accomplishing restoration objectives, while the high-retention low thinning was least effective. Increasing the array of silvicultural tools that Redwood National Park can use may prove helpful in accomplishing restoration goals in future projects.

Publication type Report
Publication Subtype Federal Government Series
Title Low thinning and crown thinning of two severities as restoration tools at Redwood National Park
Series title General Technical Report
Series number PSW-GTR-258
Year Published 2017
Language English
Publisher U.S. Department of Agriculture, U.S. Forest Service
Contributing office(s) Western Ecological Research Center
Description 8 p.
Larger Work Type Report
Larger Work Subtype Federal Government Series
Larger Work Title Coast redwood science symposium—2016: Past successes and future direction
First page 259
Last page 266
Country United States
State California
Other Geospatial Redwood National Park
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