A diameter increment model for Red Fir in California and Southern Oregon

K. Leroy Dolph

doi:10.2737/PSW-RP-210

Treesearch

A diameter increment model for Red Fir in California and Southern Oregon

Informally Refereed

Authors:

K. Leroy Dolph

Year:

1992

Type:

Research Paper

Station:

Pacific Southwest Research Station

DOI:

https://doi.org/10.2737/PSW-RP-210

Source:

Res. Paper PSW-RP-210. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 6 p

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Download (PDF 467 KB): https://research.fs.usda.gov/download/treesearch/28837.pdf

Abstract

Periodic (10-year) diameter increment of individual red fir trees in Califomia and southern Oregon can be predicted from initial diameter and crown ratio of each tree, site index, percent slope, and aspect of the site. The model actually predicts the natural logarithm of the change in squared diameter inside bark between the startand the end of a 10-year growth period. To estimate diameter increment, the predicted value is converted to a change in diameter outside bark. Data used to develop the model came from 1500 tree samples from 56 young-growth stands in the study area. Coefficients for the log-linear model were obtained using least-squares linear regression.

Keywords

increment (diameter), California red fir, Shasta red fir, California, Oregon

Citation

Dolph, K. Leroy. 1992. A diameter increment model for Red Fir in California and Southern Oregon. Res. Paper PSW-RP-210. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 6 p