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...
Residual roots from previous stand components are often cited as a major benefit to stump-sprouts of tanoak in southwest Oregon and northern California. Established patterns of belowground carbon allocation and root/shoot maintenance suggest that residual root systems of stumps
will be reduced by carbohydrate depletion and root mortality and by...
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....
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 inter-relationship of salmonberry and Douglas-fir on cutover areas was investigated in the Coast Range of western Oregon. Animal influences affecting the survival of Douglas-fir in a salmonberry
habitat were also investigated. The autecology of salmonberry was considered first by formulating a mathematical model to characterize the lateral encroachment of...
The main objective of this study was to evaluate the interaction between
herbaceous competition, fertility, and seed source on Douglas-fir survival and
growth. A secondary objective was to evaluate the effect of these various factors
on the production of lammas shoots and the selectivity of deer browse. Finally,
the role...
Understory conifer regeneration needs to occur beneath conifer-dominated
canopies if two-storied or uneven-aged structures are to be considered for western
Oregon Coast Range stand management. To ensure adequate numbers of seedlings
to meet stocking or habitat structure objectives, planting may be a solution. We
undertook a multi-level study to determine...
The release of Douglas-fir from competition with snowbrush (Ceanothus velutinus Dougl.) has often been suggested as a way to improve conifer yield in the western Cascades. This study investigated this possibility by describing changes in the availability of water and light and the response of Douglas-fir to the changing environment,...
Four different plot types were established in shrub and tree comunitities in Little Elk Valley in southwest Oregon. Ten functional (F) plots were cleared of all vegetation in a radius of three times the height of the surrounding vegetation around a single Pacific madrone (Arbutus menziesii Pursh.) tree. Ten competition...
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...