The purpose of this thesis was to investigate the use of weights in least squares regression volume table construction and thereby to determine the importance of the assumption of homogeniety of tree volume variance. Several weighted and unweighted linear regression equations were investigated using data from 340 Douglas-fir Pseudotsuga menziesii...
Commercial thinnings in a 50-year-old stand of nearly pure,
well stocked, even-aged western hemlock (Tsuga heterophylla) on the
Hemlock Experimental Forest near Hoquiam, Washington, began in
1952 and ended in 1968. The experiment consisted of two replications
of four different thinning treatments, high and low thinning, both at
frequent and...
A three stage sale was taken of two high-site, second growth
Doug1as-fir (Pseudtsuga menziesii) stands located in the extreme northwestern
portion of the Oregon Coast Range. Permanent plots were
established during the first stage variable-plot cruise. A Hartley-
List sample, taken from the first stage Douglas-fir in trees, selected
second...
In the thinning theory, the hypothesis that the stand
growth is unaffected by the density over a broad range of
densities is generally accepted today.
In this study three different measures of stand density
were used in basal area growth and volume growth
multiple regressions in even-aged managed stands, searching...
An average stand diameter yield table and a diameter growth
per decade table are presented for unmanaged stands of quaking
aspen in southwest Colorado. The yield table presents yields per
tree for the following utilization standards: 1. total cubic-foot
volume minus the stump, 2. cubic-foot volume to a 4-inch top,...
Site index and height growth equations for mountain hemlock
(Tsuga mertensiana (Bong.) Carr.) were developed from 37 trees located
in the Deschutes Nationa1 Forest. Initial analysis indicated the need
for stratification by habitat type. Preliminary community classifications
were used to develop three strata for the study. Two approaches
to model...
The purpose of this study was to examine the geometry of enclosed
circles in order to predict the probable effects of increment
boring methods used in determining basal area growth. Of specific
concern was the comparison of areas derived from sets of borings
taken from opposite sides of the tree...
The effectiveness of sapwood basal area as an estimator of individual
tree basal area growth was tested on several young, even-aged
Douglas-fir stands, stocked at varying densities. For all densities,
ranging from partially open-grown to very overstocked stands, the
null hypothesis that there was no association between sapwood basal
area...
