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Consistent Height-Growth and Growth-Rate Estimates for Remeasured Plots

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Abstract:

Consistent height-growth and growth-rate estimates were made for use in a managed stand growth simulator based on data from remeasured Douglas-fir (Pseudotsuga rnenziesii) plots in the Pacific Northwest. Techniques were developed for simultaneous fitting of height-growth and growth-rate curves, overcoming inconsistent estimates of age of 4.5-ft-tall trees, iterative estimating of site producing polymorphic curves, introducing site factors and treatment effects, and overcoming minor problems encountered during the analysis. The equations produced agree well with those developed by King in 1966 for Douglas-fir in the same area, using different data and different procedures. This suggests the two equations are good representations of regional height-growth relations. Forest Sci. 27:711-725.

Keywords: Douglas-fir; Growth analysis; Site index

Document Type: Journal Article

Affiliations: Retired Forest Mensurationist, Pacific Northwest Forest and Range Experiment Station, Portland, Oregon 97232

Publication date: December 1, 1981

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