The broadest goal of the research covered in this thesis was to contribute
to our limited knowledge of high elevation forest soil ecology. Based on the reeds
of funding agencies, specific objectives were to examine 1) how climate-induced
Abies lasiocarpa ([Hook.] Nutt.) forest expansion affects soil nutrient pools, 2) the...
Abies lasiocarpa (Hook.) Nutt. (sub-alpine fir) trees of comparable
vigor growing in eastern British Columbia were studied in
order to determine the effects of cork bark disease on phellogen and
vascular cambium activity.
Diseased trees form hard deeply fissured rhytidome several
inches thick over large areas of the bole when...
Annosus root disease (Heterobasidion annosum (Fr.) Bref.) is causing notable conifer
mortality in grand fir habitat types in central Idaho. The most significant mortality is occurring in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco.) trees of all age classes. This project was designed to study some aspects of the general biology of...
Mountain pine beetle, Dendroctonus ponderosas Hopk., reached near epidemic levels in lodgepole pine stands in the Sulphur Creek-Black Butte area. Lodgepole pine are probably more susceptible due to the overstocked conditions of stands, and high incidence of girdling of the base of trees by porcupines. The infestation in this area...
