Skip to Main Content
Height-age and site index curves for Pacific silver fir in the Pacific Northwest.Author(s): Gerald E. Hoyer; Francis R. Herman
Source: Res. Pap. PNW-RP-418. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 33 p
Publication Series: Research Paper (RP)
Station: Pacific Northwest Research Station
View PDF (2.07 MB)
DescriptionForty felled dominant and codominant Pacific silver fir trees (Abies amabilis Dougl. ex Forbes) from 39 locations provided the basis for height-age and site index curves. Trees were from upper slope forests of the Cascade Range in Oregon and Washington. Trees ranged in age from 100 to 300 years and were identified by their height-growth trend as free growing throughout their lives. Twenty additional dominant trees with height growth retarded when they were young were excluded from the site index and height-growth analyses. The early rate of diameter growth of these 20 trees was used to develop a general guideline identifying non free-growing dominant trees. Equations and height-age curves are presented. A multiple regression equation was developed to express site index (height at age 100) as a function of total tree height and age at breast height. Equations were developed .to estimate the number of years free-growing trees need to reach breast height for the range of site index values. Conversion equations are provided to estimate height at age 50 for curves representing index heights at age 100. The results give forest managers working tools for use in managing silver fir.
- You may send email to email@example.com 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.
CitationHoyer, Gerald E.; Herman, Francis R. 1989. Height-age and site index curves for Pacific silver fir in the Pacific Northwest. Res. Pap. PNW-RP-418. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 33 p
KeywordsSite index, Pacific silver fir, Abies amabilis, height growth, dominant, stem analysis, Pacific Northwest
- Growth of site trees and stand structure in mixed stands of Pacific silver fir and western hemlock.
- Site index curves for young-growth California white fir on the western slopes of the Sierra Nevada
- Site index curves for white fir in the southwestern United States developed using a guide curve method
XML: View XML