Index Catalog // Hyrax

A model of forest nitrogen cycling to assess the effects of management intensity on long-term productivity in Douglas-fir forests of the Pacific Northwest

O Criador:: Krzak, Joan
Abstract:: 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...
Resource Type:: Dissertation

Comparative development of a thinned and a natural Douglas-fir stand from 45 to 60 years of age

O Criador:: Groman, William A.
Abstract:: 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...
Resource Type:: Dissertation

Computer simulation of Douglas-fir tree and stand growth

O Criador:: Arney, James Douglas, 1941-
Abstract:: 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...
Resource Type:: Dissertation

Developing optimal programs for thinning young-growth Douglas-fir stands

O Criador:: Randall, Robert M.
Abstract:: 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,...
Resource Type:: Dissertation

Effects of herbaceous weed control on young Douglas-fir moisture stress and growth

O Criador:: Preest, David Stanley
Abstract:: 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...
Resource Type:: Dissertation

Effects of light preconditioning on the seasonal water relations of nursery-grown Douglas-fir

O Criador:: Drew, Allan Pierce
Abstract:: 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...
Resource Type:: Dissertation

Freezing resistance of tissues in the twig of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)

O Criador:: Alden, John Norman
Abstract:: 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...
Resource Type:: Dissertation

Geographic variation in juvenile growth characteristics of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) from the coastal ranges of California

O Criador:: Griffin, Anthony Roderick
Abstract:: 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...
Resource Type:: Dissertation

Isoenzyme polymorphism in provenances of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco var. menziesii)

O Criador:: Yang, Jenq-chuan
Abstract:: 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...
Resource Type:: Dissertation

Physiological responses of four Douglas-fir populations in three contrasting field environments

O Criador:: Emmingham, William H.
Abstract:: 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...
Resource Type:: Dissertation

Hyrax

A model of forest nitrogen cycling to assess the effects of management intensity on long-term productivity in Douglas-fir forests of the Pacific Northwest

Comparative development of a thinned and a natural Douglas-fir stand from 45 to 60 years of age

Computer simulation of Douglas-fir tree and stand growth

Developing optimal programs for thinning young-growth Douglas-fir stands

Effects of herbaceous weed control on young Douglas-fir moisture stress and growth

Effects of light preconditioning on the seasonal water relations of nursery-grown Douglas-fir

Freezing resistance of tissues in the twig of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)

Geographic variation in juvenile growth characteristics of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) from the coastal ranges of California

Isoenzyme polymorphism in provenances of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco var. menziesii)

Physiological responses of four Douglas-fir populations in three contrasting field environments

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