Calibration and modification for the Pacific Northwest of the New Zealand Douglas-fir silvicultural growth model
By: James W. Flewelling and David D. Marshall.
Contributors: Marshall, David D.; Pacific Northwest Research Station (Portland, Or.)
Series: General technical report PNW -- GTR-754; General technical report PNW -- 754.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
Published: 2008
Place of publication: Portland, OR
Language: eng
Number of pages: 42
Subjects: Douglas fir -- Northwest, Pacific -- Growth -- Mathematical models
Description: This paper describes a growth model for young plantations of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) growing in the Pacific Northwest. The overall model has three major components. The first is a yield model for diameter and height distributions describing stands prior to pruning or precommercial thinning. The second component is an annual per-acre net increment model adapted from a recent model for Douglas-fir plantations in New Zealand; thinning and pruning are features of the model. The third component is growth equations for cohorts of individual trees; the results from this component are adjusted to match those from the second component. Fitting data are from Stand Management Cooperative experiments, with top heights generally below 75 ft. An intended use of the model is the evaluation of pruning regimes, in conjunction with the ORGANON model for growth at older ages, and TREEVAL model for clear-wood recovery and economic evaluation.
Notes: Cover title.

"June 2008."

Includes bibliographical references (p. 38-39).

Also available via Internet.