Twelve plots at six sites in southwestern Oregon were studied to determine the degree to which various soil characteristics are related to the occurrence and growth of Chamaecyparis lawsoniana and Thuja plicata. Soil profiles and vegetation were described in each plot, and measurements were made of insolation, soil and litter...
Larix laricina in Alaska occurs on sites ranging from productive
slopes and riverbottoms to wet bogs underlain by permafrost. It is
largest on sites without permafrost, where it is associated with
Picea glauca, but is much more common in bogs, where it occurs with
Picea mariana. In this study, I...
The effects of burial by tephra (volcanic aerial ejecta) on
forest understory plants were examined northeast of Mount St. Helens,
Washington, in the area where the 18 May 1980 eruption deposited
tephra but did not destroy canopy trees. At six sites along a tephra
depth gradient from 2-15 cm, understory...
Comparisons were made of the tissue water relations, stomatal conductance and growth of grand fir (Abies grandis), white fir (Abies concolor) and their hybrids growing in a western Oregon plantation. The grand fir were naturally-regenerated trees native to the study site. White fir and hybrids were the progeny of controlled...
The dynamics of stands in the mid-elevation old-growth
Douglas-fir (Pseudotsuga menziesii) forests of the central western
Oregon Cascade Range were investigated using stand structure
analysis. Trees with different growth rates were commonly present
in the same stand, which resulted often in a weak correlation
between tree diameter and age. Thus,...