Armillaria (Fr. ex. Fr.) is a parasite whose pathogenicity
and role in forest ecosystems often depends upon the
physiological condition of the tree. Therefore, I tested the
frequency and severity of Armillaria ostoyae (Romagn.) Herink
infection among Abies grandis (Dougl.) Lindl., Larix
occidentalis Nutt., Pinus contorta var. latifolia (Engelm.),
Pinus...
A comparative study was done on data collected by Weyerhaeuser
Company on l,6144 second-growth Douglas-fir, Pseudotsuga menziesii,
trees. The variable used in the study was the percent difference,
positive or negative, between the volumes given by each of three
different log rules and the standard tree volumes determined by
Weyerhaeuser...
Part of the Mexican system of forest management is based on the "Unidades Industriales de Explotacion Forestal" (UIEF). An economic analysis based on the
profitability of the forest under different alternatives was performed to evaluate the efficiency of the UIEF's system of forest management using Pinus hartwegii growing
in the...
The Philippines relies heavily on timber product exports for its foreign exchange requirements. In recent years, however, it adopted log export restrictions as a hedge against the rapid depletion of its timber resources. Although conducted independently, its ASEAN partners (Malaysia and Indonesia), have likewise instituted similar restrictions on their own...
A rapid and efficient procedure that required no partitioning was developed for the purification of abscisic acid (AbA) from the needles of Douglas-fir seedlings. Extracted needle pigments were removed by a
PVP column and the eluted AbA was concentrated on a DEAE column. The AbA was eluted from the DEAE...
In the Oregon Coast Range, total biomass and biomass increment, leaf area, the relationship between leaf area and sapwood area, and patterns of growth and form of individual trees, were studied in 40 Douglas-fir (Pseudotsuga menziesfi (Mirb.)
Franco) trees from three adjacent 22 year-old plantations that had developed at different...
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...