Four brushfield reclamation methods were compared on a 28 hectare area supporting a dense overstory of red alder and a thick
understory of deciduous brush species. Tractor scarification, aerial application of 2, 4, 5-T and picloram followed by broadcast burning or tractor crushing, and aerial application of glyphosate were performed...
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...
A brown and burn site preparation project was monitored on an
alder-dominated brushfield in the western Oregon Coast Range. Prefire
vegetation was surveyed, and the fuel complex created by felling
and aerial application of herbicides was evaluated. Post-fire vegetation
was examined during the four months following the August, 1974,
fire....
Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) ranging
from 9.6 to 14.3 inches diameter breast height were treated with
the organic arsenicals, monosodium methanearsonate (MSMA) and
cacodylic acid. Treatments were applied at monthly intervals from
February, 1967 to October, 1968, to ten to 25 trees each month.
Treated trees were sampled in...
Nutrient losses of the biologically responsive anions, nitrate and bicarbonate together with the major cations, were monitored on 14 small watersheds in Oregon's Coast Range and evaluated in relation to management-induced disturbance. Mixed forests of Douglas-fir and red alder had dominated these high-nitrogen sites prior to treatment. A paired-watershed experimental...
Photosynthetic response to light and temperature was modeled using data from a small red alder (Alnus rubra B. ) community growing in a controlled environment chamber linked to the computer. This new system controls air temperature, root temperature, and vapor pressure over a wide range, and both light intensity and...
The initial distribution of organic arsenical silvicides was
measured in the trees, litter and soil of four forest types in the
Pacific Northwest following a standard, precommercial chemical
thinnning. Factors which influenced the persistence, movement or
fate of these compounds were noted and used to evaluate differences
in the generalized...
The young larvae of the Douglas-fir tussock moth (Orgyia pseudotsugata (McDunnough) (DFTM) are dependent on the new foliage of its ho'sts (Doug1as-fir, grand fir, white fir) for their food supply. The phenology of the DFTM and its hosts are synchronized, with
egg hatch and dispersal occurring one to three weeks...
The use of chemicals such as the triazines (especially atrazine) and mixtures of the triazines and 2,4-D or 2,4,5-T has become almost standard practice in some parts of the world for selectively controlling grasses and other herbaceous weeds to conserve moisture for and/or prevent the smothering of newly-planted conifers. In...
The selection of planting stock is a critical step in the reforestation
planning process. In addition to selecting the proper seed source
and species for the planting site, consideration must be made for the
type of planting stock which will be used. The survival and growth
potential of various classes...
This study concerns the effect of pre-harvest killing of commercial
sized, forty year old western hemlock (Tsuga heterophylla
(Raf.) Sarg.) on subsequent stump infection by Fomes annosus (Fr.)
Karst. Further evaluations were made on tree drying, loosening of
bark, wood deterioration and rate of crown and cambial death. Findings
on...
A detailed analysis was performed on the juvenile growth of six types of Douglas-fir stock under the influence of typical seral Coast Range vegetation. Objectives were to analyze competitive influences important to the growth of tree seedlings and evaluate differences between stock type characteristics and growth patterns in response to...
The objective of this study was to examine the life history of
vine maple on the H. J. Andrews Experimental Forest. This study was
conducted as a part of an I. B. P. general study of understory biomass
and productivity. The specific objectives were to 1) estimate the
contribution of...
Herbicides are being used as a tool by forest managers to speed
the restocking of sites where tree seedlings face competition from
grasses for limited moisture, light and nutrients. Retarded growth
or, more commonly, death of the seedlings would occur if a selective
herbicide was not used to control competing...