Whiskey springs long-term coast redwood density management; final growth, sprout, and yield resultsAuthor(s): Lynn A. Webb; James L. Lindquist; Erik Wahl; Andrew Hubb
Source: In: Standiford, Richard B.; Weller, Theodore J.; Piirto, Douglas D.; Stuart, John D., tech. coords. Proceedings of coast redwood forests in a changing California: A symposium for scientists and managers. Gen. Tech. Rep. PSW-GTR-238. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 571-581
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (0 B)
Multi-decadal studies of commercial and precommercial thinning in redwood stands are rare and consequently of value. The Whiskey Springs study at Jackson Demonstration State Forest has a data set spanning 35 years. In addition to growth and yield response to commercial thinning, the results provide important information for evaluating regeneration and alternative silviculture treatments.
In 1970, the original treatment thinned a 40 year-old redwood forest from below to densities representing 25, 50, and 75 percent of the initial basal area (approximately 400 ft2/ac). Three 0.2-ac plot replicates within each of the four density levels were assigned in a randomized design. In the 35 years after thinning, the basal area of the 25, 50, 75 and 100 (control) percent retention areas increased by 168, 232, 226 and 210 ft2/ac of basal area respectively. There was some indication that mean annual increment (ft3/ac) had culminated at age 70 years for some treatments.
Redwood sprouts and other conifer seedlings were abundant in the 25 and 50 percent retention areas. Precommercial thinning subplots were established within these two treatments in 1986, reducing the understory to 200, 300, and 400 sprouts/ac. The understory diameters ranged from 2 to 6 inches at DBH for the 25 percent retention 35 years after the commercial thinning.
- 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.
CitationWebb, Lynn A.; Lindquist, James L.; Wahl, Erik; Hubb, Andrew. 2012. Whiskey springs long-term coast redwood density management; final growth, sprout, and yield results. In: Standiford, Richard B.; Weller, Theodore J.; Piirto, Douglas D.; Stuart, John D., tech. coords. Proceedings of coast redwood forests in a changing California: A symposium for scientists and managers. Gen. Tech. Rep. PSW-GTR-238. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 571-581.
KeywordsSequoia sempervirens, coast redwood, commercial thinning, precommercial thinning, regeneration, sprouting
- The listing of coast redwood as endangered under the IUCN red list: lessons for conservation
- Decomposition and N cycling changes in redwood forests caused by sudden oak death
- Life cycle impacts of manufacturing redwood decking in Northern California
XML: View XML