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Filtering by: Subject Douglas fir -- Oregon, Eastern -- Growth Degree Field Forest Management

Nonlinear models of height growth for Douglas-fir in southwestern Oregon

Creator:

Scrivani, John A.

Abstract:

A review is made of methods which assess the bias and non-normality of parameter estimates and predictions obtained with nonlinear regression. Particular emphasis is placed upon curvature measures of nonlinearity, related measures of parameter and prediction bias, and the effects of reparameterizations. Alternate models of individual tree height growth are...

Resource Type:

Dissertation
Construction of regression models for predicting crown development in southwestern Oregon Douglas-fir

Creator:

Maguire, Douglas A. (Douglas Alan)

Abstract:

A branch mortality dating technique and whorl sampling strategy were implemented to model five-year crown recession from data collected on temporary plots. Twenty-eight Douglas-fir from two levels-of-growing- stock studies in Oregon and Washington were first dissected to validate the proposed dating technique and assess alternative sampling strategies. Branch mortalities in...

Resource Type:

Dissertation
Development of tree height and diameter growth equations for mid-Willamette Valley Douglas-fir

Creator:

Ritchie, Martin W.

Abstract:

Equations for predicting height growth, basal area growth and diameter inside bark are presented for Douglas-fir. Basal area growth equations for grand fir are also presented. The growth models were developed for use in an individual tree/distance independent growth simulator. Various model forms and measures of competitive stress were compared...

Resource Type:

Masters Thesis