Growth of coast redwood and Douglas-fir following thinning in second-growth forests at Redwood National Park and Headwaters Forest ReserveAuthor(s): Phillip J. van Mantgem; Jason R. Teraoka; David H. LaFever; Laura B. Lalemand
Source: Gen. Tech. Rep. PSW-GTR-258. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 279-286
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: Download Publication (535.0 KB)
Managers of second-growth forests at Redwood National Park and the Bureau of Land Management’s Headwaters Forest Reserve encourage the development of late seral forest characteristics using mechanical thinning, where competing vegetation is removed to promote growth of residual trees. Yet the ability to quantify and reliably predict outcomes of treatments such as these is hindered by the long time scales at which forests respond to thinning. Here we present analyses of tree growth at Redwood National Park (RNP) and Headwaters Forest Reserve (HDWT) from sites that have had > 5 years to respond to thinning treatments.
Compared to untreated stands, thinned stands had lower stem density (trees ha-1) and basal area (m2 ha-1), primarily due to removal of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Individual tree growth (basal area increment, BAI, m2 yr-1) was related to tree size (basal area, m2) and treatment history, with the highest growth rates observed in large trees. Both redwood (Sequoia sempervirens (D. Don) Endl.) and Douglas-fir appeared to have a small, but detectable, positive growth response to thinning treatments. Early results suggest a large degree of variation among sites, with possible systematic differences in growth responses between RNP and HDWT. Future work will focus on identifying site-level differences (site quality, local competition, slope, aspect, stand age, distance from the ocean) to improve our understanding of the growth response.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Citationvan Mantgem, Phillip J.; Teraoka, Jason R.; LaFever, David H.; Lalemand, Laura B. 2017. Growth of coast redwood and Douglas-fir following thinning in second-growth forests at Redwood National Park and Headwaters Forest Reserve. In: Standiford, Richard B.; Valachovic, Yana, tech cords. Coast redwood science symposium—2016: Past successes and future direction. Proceedings of a workshop. Gen. Tech. Rep. PSW-GTR-258. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 279-286.
- Ninety-two years of tree growth and death in a second-growth redwood forest
- The New Economies of the Redwood Region in the 21st Century
- Using wood quality measures to evaluate second-growth redwood
XML: View XML