Completely climatized cuvettes were used to follow the CO₂
gas exchange of red fescue (Festuca rubra L.), growing on a fertilized
and an unfertilized plot, during a growing season from May
through October. Objective of the study was to determine the effect
of environmental factors on the seasonal CO₂ gas...
Douglas-fir (Pseudotsuga menziesii (Mirb. ) Franco) seedlings
of a high elevation Rocky Mountain source and a low elevation coastal
source were pretreated under both high and low intensity artificial
light in a growth chamber and outside in a cold frame. Net photosynthesis
was then measured at three ages, 6, 10,...
The objective of this study was to examine the transpirational
behavior of Douglas-fir seedlings from two origins,, each grown in
two environments, and subject to a range of moisture stress. Forks
and Goldendale, Washington were the mesic and xeric seed origins
respectively. One-half of the seedlings from each origin was...
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...
The ecological and silvicultural importance of snowbrush,
Ceanothus velutinus, in the areas west of the summit of the Oregon
Cascades was studied. Particular attention has been given its nitrogen-
fixing ability under both field and greenhouse conditions.
On west slopes of the Oregon Cascades snowbrush occurs above
2, 500 feet...
In this study transpiration rates were measured on Douglas-fir
seedlings from five seed sources. The seedlings were grown under
two environments, a growth chamber and outside in cold frames.
Transpiration was measured at two ages, 4 and 16 weeks. Comparison
of transpiration rates was made at low soil moisture stress....
