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Title: Levels-of-growing-stock cooperative study in Douglas-fir: report no. 08—The LOGS Study, 20-year results.

Author: Curtis, Robert O.; Marshall, David D.;

Date: 1986

Source: Res. Pap. PNW-RP-356. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 124 p

Publication Series: Research Paper (RP)

Description: This progress report reviews the history and status of the cooperative levels-of-growing-stock study in coast Douglas-fir, begun in 1961, in Oregon, Washington, and British Columbia. It presents new analyses, including comparisons among some installations. Data now available are primarily from the site II installations, which are approaching completion of the study. Growth is strongly related to growing stock. Thinning treatments have produced marked differences in volume distribution by tree sizes. During the fourth treatment period, current annual increment was still about double the mean annual increment, and differences in volumes and size distributions among treatments have been increasing rapidly. There are considerable differences in productivity among installations, beyond those accounted for by site index differences. The LOGS study design is evaluated.

Keywords: thinnings, (-stand volume, growing stock, (-increment/yield, Douglas-fir, Pseudotsuga menziesii, series—Douglas-fir LOGS

Publication Notes:

  • 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.
  • You may send email to pnw_pnwpubs@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

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Curtis, Robert O.; Marshall, David D. 1986. Levels-of-growing-stock cooperative study in Douglas-fir: report no. 08—The LOGS Study, 20-year results. Res. Pap. PNW-RP-356. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 124 p

 


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