Pollen contamination was investigated in one block (block 4) of a 10-block Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seed orchard complex in western Oregon. Blocks (25 clones each) represent different breeding zones; thus, contaminant pollen sources not only included the adjacent natural stand of Douglas-fir, but also other blocks within the...
Abstract: Genetic variation in drought hardiness traits and their genetic correlations with growth potential and17re1c6overy
traits were investigated in 39 full-sib families of coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.)
Franco) from southwestern British Columbia. Seedlings of these families were grown in raised nursery beds and subjected
to three moisture...
Prediction of year-class strength is a critical challenge for fisheries managers. Theoretically,
predictions of recruitment should be better when they are based on estimates of cohort
size taken close to the age of recruitment and may improve if the effects of environmental factors
that influence pre-recruit mortality are accounted for....
The relationships between leaf area and sapwood and inner bark quantities (widths, areas, and volumes) were studied in an attempt to understand the design criteria for sapwood quantity in eighteen 34-year-old Douglas-fir (Pseudotsuga menziesii) trees with a wide range of leaf areas, sapwood areas, and dry masses of leaf, xylem,...
Hornets of the genus Vespa are recognized as efficient and devastating predators of honey bees, especially in tropical and subtropical biomes. Of the four species of honey bees in the genus Apis only A. dorsata Fabr., the giant honey bee, appears free from attack by hornets (Seeley et al. 1982)....
Nondimensionalized equations of motion for waterdrops, not necessarily obeying Stokes's
law, are derived and used to calculate the response of various size drops to changes in horizontal
wind speed. We find that (1) cloud drops respond almost instantaneously to changes
in wind speed, whereas raindrops require considerable time to adjust,...
Experiments conducted on the Oregon continental shelf in June 1979 indicate that the boundary layer
flow at the seafloor was hydrodynamically smooth. Fine-resolution velocity profiles are used to test the
assumption that the flow behaved like a universally similar, neutrally buoyant flow over a smooth wall.
The non-dimensional thickness of...
An experiment in 199 m of water on the Oregon shelf produced continuous current speed profiles
down to the sediment-water interface. These profiles show that the velocity structure above the
viscous sublayer is consistent with that expected when form drag influences the boundary layer flow.
They show two logarithmic-profile regions,...
The effect of pretreatment of Douglas-fir flakes with CCA-C, borate, and azaconazole on properties of flakeboard was studied. Flakes had higher retention levels of CCA-C and borate in their ends than in their centers. The distribution of chemicals was uniform in panels, which indicates that the chemicals did not migrate...
Swiss needle cast (SNC) severity in Douglas-fir (Pseudotsuga menziesii) has been shown to vary spatially and temporally in response to climatic factors both within its native range and in regions where it has been planted as an exotic species. Survival models were developed for different Douglas-fir needle cohorts to enhance...