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Title: A diameter increment model for Red Fir in California and Southern Oregon
Author: Dolph, K. Leroy
Source: Res. Paper PSW-RP-210. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 6 p
Station ID: RP-PSW-210
Description: 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 ofthe 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.
Key Words: increment (diameter), California red fir, Shasta red fir, California, Oregon
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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.