In 1957 three Douglas-fir stands (15-, 25-, and 40-year-old age classes) were selected on a tree farm in the Cascade foothills of
northwestern Oregon to study factors affecting site productivity. Soil-moisture, soil-temperature and seasonal radial- growth pattern measurements were made with a Colman moisture meter and a dial gauge dendrometer...
The main objective of this investigation was to evaluate relationships
between the production and utilization of forage and deer
browsing of hand-planted Douglas-fir seedlings. A secondary purpose
was to study some effects of selected physical and biological
site factors on the survival and growth of fir seedlings.
Field work was...
This study was undertaken to determine the
effects of different chilling treatments during the dormant
season upon growth of Douglas-fir seedlings0 In
addition it was planned to determine whether seedlings
native to various geographic areas differ in their chilling
requirements0
The hypotheses were advanced, based on previous
studies, that chilling...
Chemical and microbial analyses were made at four seasonal intervals on soil horizons under red alder, conifers, and mixed
alder-conifers at the Cascade Head Experimental Forest, established in 1937 by the U. S. Forest Service near Otis, Oregon.
Microbial analyses showed that although plate counts of molds and bacteria fluctuated...
Commercially collected Douglas-fir seed from a moist coastal
ecotype (LaPush, Washington) and a dry inland ecotype (Kaibab
National Forest, Arizona) were subjected to osmotic stresses ranging
from 0 to -8 atmospheres using Carbowax polyethylene glycol 6000
during imbibition and germination. To determine the effect of osmotic
stress on the initiation...
Relationships between soil-water stress and plant-moisture
stress were studied with respect to soil classification and cambial
activity in Douglas-fir.
The study sites were forested with Douglas-fir and located in
McDonald Forest and near Marys Peak in the Oregon Coast Range.
Soil-water depletion was followed by the use of gypsum blocks...
The role of moisture stress in seedling physiology and establishment
was studied in both the field environment and laboratory
experiments. Plant moisture stress was measured using the pressure
chamber technique. This technique was modified and tested using a
fascicle of pine needles as a sample, an improvement which allows the...
Foresters in the Pacific Northwest are directing increasing effort into the management of young-growth forests. These foresters find themselves in a transition period in which they are beginning to develop the framework for managing young-growth forests while they continue to manage substantial reserves of old-growth timber. In this transition period,...
The relative freezing resistance of tissues in the stem, foliage and buds of terminal twigs from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) was investigated at about ten-day intervals from summer until the following spring. Tissues from growing twigs collected before development of dormancy had no freezing resistance and were killed immediately...
An understanding of the dynamics of individual tree and stand
growth, development, and structural patterns during the immature
formative years of a commercial species is essential to determine
correct thinning practices necessary to attain desired objectives.
This study compared a natural, medium-site Douglas-fir stand
and an adjacent similar stand released...
A mathematical model has been developed to describe the growth
of individual Douglas-fir trees under a variety of stand conditions and
management schedules. The model was developed using empirical
data from open-grown trees and reducing growth capacities of height,
stem, and crown as functions of intertree competition indices. Any
initial...
The relation of bud and cambial activity to root initiation and
elongation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)
stem cuttings was studied through two successive growth cycles.
Stem cuttings of current season's growth were taken periodically
from field-grown Douglas-fir trees to determine: (1) origin and
development of root initials; and...
A sample of 181 wind pollinated families, representative of the range of environmental conditions occupied by Douglas-fir in northern California, was used as a basis for studying variation in early height growth, phonology, and seed characteristics. Seedlings were raised at Corvallis, Oregon, in a nursery trial designed to evaluate response...
Douglas-fir seedlings of a single seed source were grown in a nursery under three levels of light intensity: 9, 44, and 100 percent of full light. Growth over an entire growing season was monitored in terms of proportionate distribution of dry matter to shoot and root systems. This was replicated...
When trees from 16 populations of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco. var. menziesii) were grown at ten geographically diverse locations for seven years, those from a Vancouver Island source were among the top three for height growth on nine of the ten plantations (Rowe and Ching, 1974). In contrast, growth...
Douglas-fir bark was extracted with n-hexane. A light-colored
"wax-like" solid was recovered from the extract by evaporation of
the solvent. Chemically intact sterol esters and ferulic acid esters
were isolated from the "wax" without saponification or degradation
as had been necessary in former investigations. The characterization
of the intact esters...
Genetic variability in natural populations of Douglas-fir was
studied at molecular level by investigating the variations of some
primary gene products, i. e. enzymes. Using the techniques of disc
gel electrophoresis and biochemical staining, the isoenzyme patterns
of leucine aminopeptidase, esterase and glutamate oxaloacetate
transaminase are characterized in young seedlings...
Profitable, even-aged forest management depends on the early establishment
and rapid growth of each new forest crop. These, in turn,
require that the young trees have access to an adequate supply of
native resources of moisture, nutrients and light. In Mediterranean-type
climates, competition for soil moisture is the most serious...
The objectives of this study were to 1) characterize the layering in the wall of the Douglas-fir (Pseudotsuga. menziesii (Mirb. ) Franco) phellem cell, 2) determine the pitting present in this cell wall and 3) determine what compounds are present in the middle lamella of this cell. To accomplish the...
From a preliminary 1969 foliar analysis, eight provenances were chosen from the sixteen included in a region-wide, reciprocal Doulgas-fir provenance study for further study of variation in foliar nutrition. In the fall of 1969 separate foliar samples were collected from ten
trees per provenance at each of ten plantations ranging...
Net photosynthesis was measured for photosynthetic light efficiency and capacity on two-year-old plants from eight different seed sources in three measurement periods. The measurement periods corresponded to the physiological periods 1) prior to bud swelling, 2) after needle elongation, and 3) predormancy. Measurement period differences in both photosynthetic efficiency and...
Experiments were conducted to determine if the plagiotropic
growth habit of rooted cuttings of Douglas-fir might result from a
system favoring the accumulation of indoleacetic acid in the adaxial
side of the shoot in response to vertical placement.
Actively growing excised branch terminals were subjected to
gravitational disorientation to determine...
This thesis is divided into three chapters. For all chapters, the experiments described deal with the responses of all or a subset
of 72 wind-pollinated Douglas-fir families from 36 different locations in southwestern Oregon. Wind-pollinated seed was collected from each of two trees at each of the 36 locations. The...
A systematic investigation was made of the distribution of short wave radiation within the crown of an open-grown Douglas-fir tree. The study tree was 23 years old, 14 meters tall and had a maximum crown diameter of about ten meters. Global radiation was measured every 15 cm along eight different...
This research dealt with the direct environmental influence of atmospheric vapor pressure on stomates of Pseudotsuga menziesii, Picea engelniannii, and Fragaria X ananassa, and the indirect physiological
control of stomates by abscisic acid in Pseudotsuga menziesii. Two ventilated porometers (diffusion and steady-state) were compared on four broadleaf and five coniferous...
The objective of this study was to assess the effects of
forest management intensity on long-term productivity of Pacific
Northwest Douglas-fir forests. The components of management intensity
included rotation length, timber utilization standard (whole
tree or bole only), method of slash treatment (remove/burn or leave)
and fertilization practice (urea nitrogen...
Chapter 1 Growth and Survival of Root-Wrenched Douglas-fir Seedlings Root wrenching of seedlings (severing the roots 15 cm below the soil surface) was investigated as a nursery practice to improve growth and survival of field-planted Douglas-fir from six local seed sources
in the Pacific Northwest. At lifting, shoots of wrenched...
Cell aggregate size in both Douglas-fir and poplar suspension cultures was reduced by the addition of the chelator compounds EDTA and CDTA at concentrations under 100 ppm. Reduced cell aggregate size increased growth efficiency of suspension cultures of both species. Cell aggregates 550 j.z. or smaller in size were used...
Vegetative propagation is most effective when individuals of demonstrated superior characteristic can be propagated. For this
reason, a method for the induction of adventitious buds on cultured Douglas-fir shoot tips from 20-25 year old trees was developed. Douglas-fir shoot tips failed to survive and grow on a full strength Murashige...
Because Douglas-fir [Pseudotsuga menziesii(Mirb.)Franco] bark is a raw material produced in our renewable forests along with wood, an understanding of the ultrastructure of bark cells is of paramount importance if wood technologists are to utilize the bark to the fullest potential. The objectives of this study were to develop microscopic...
This thesis explored the relationships between the growth of Douglas-fir seedlings and light and moisture resource availability as influenced by competitor type and density in the Oregon Coast Range. Twelve 360 m2 Nelder plots, encompassing a range of 300 to 15,000 cm2 per plant in 48 spokes, were established in...
The rate and manner of bioniass loss from decomposing Douglas-fir and western hemlock boles in mid-elevation forests of the central Cascade Range were measured. Bole bark and wood were considered separately. Loss of bole wood due to respiration was measured by change in bole wood density. Loss of bole wood...
Existing forest site maps have been described as "invaluable
tools" in forest management. Their, economic value potentially materializes
as the summed advantage from better decisions in all phases of
forestry.
Via Bayesian decision analysis, this study establishes optimal
use and economic value of site information for one facet of management...
Quantitative and qualitative information on the retention of chlorinated residues in chloropicrin treated wood is lacking. Retention of chloropicrin and its chemical breakdown products in wood, and the effects of chloropicrin treatment of wood on invading decay fungi are explored in this thesis. Chlorinated residues in amounts up to 1.5%...
The physiological and biochemical responses of Douglas-fir seeds to stratification, redrying, storage and subsequent germination were determined. Stratification increased seed vigor, embryo and gametophyte
phosphorylative efficiency and RNA synthetic ability. Redrying seems to increase the rate of enthryonic nucleic acid synthesis, speed of germination and seedling vigor. ATP, total adenosine...