Treesearch

This note presents cubic-foot volume equations and tables for western juniper (Juniperus occidentalis Hook. ). Total cubicfoot volume (ground to tip, excluding all branches (CVTS)) is expressed as a function of diameter at breast height (DBH) and total height. Utilizable cubic-foot volume (top of 12-inch stump to a 4-inch top, excluding all branches (CV4)) is expressed as a function of CVTS and DBH.

Repeated radiation frosts caused no apparent harm to the majority of lodgepole pine (Pinus contorta Dougl.) seedlings planted on a pumice flat in south-central Oregon. For most but not all of the ponderosa pine (Pinus ponderosa Dougl.) seedlings planted with the lodgepole pine, however, damage from radiation frost resulted in reduced height growth.

Ash leachates from recently burned litter in a ponderosa pine forest in central Oregon were tested for their effects on growth and development of Armillaria mellea in culture. Two isolates were used: one from an infected western hemlock and the other from an infected ponderosa pine tree. Colonies developing from agar discs containing mycelia of the hemlock isolate and grown on a solid agar-base medium supplemented with leachates extracted from 1, 5, 10, or 20 grams of ash per liter of media had significantly lower dry weights than colonies grown on nonsupplemented medium. There were no...

Volume equations for thirteen species of California hardwoods were developed from measurements of 766 sample trees from all parts of the state. The species included: bigleaf maple (Acer macrophyllum Pursh), Pacific madrone (Arbutus menziesii Pursh), giant chinkapin (Castanopsis chrysophylla (Dougl.) A. DC.), tanoak (Lithocarpus densiflorus (Hook. & Arn.) Rehd.), coast live oak (Quercus agrifolia Nee), canyon live oak (Quercus chrysolepis Liebm.), blue oak (Quercus douglasii Hook. & Arn.), Engelmann oak (Quercus engelmannii Greene), Oregon white oak (Quercus garryana Dougl. ex Hook),...

Growth of nine wood-decaying basidiomycetes was measured on media containing 10, 100, and 1,000 parts per million (p/m) Lauricidin with or without 0.1 percent ethylenediaminetetraacetic acid (EDTA). EDTA alone significantly reduced the growth of all fungi tested. Lauricidin at 1,000 p/m significantly retarded the growth of all fungi except two: Ganoderma applanatum and Armillariella mellea. The addition of EDTA to 1,000 p/m Lauricidin completely inhibited Echinodontium tinctorium, Fomitopsis officinalis, and Perenniporia subacida. These compounds show promise as constituents of tree-wound...

The 10-year growth response from a spacing study in an even-aged stand of western larch (Larix occidentalis Nutt.) and Engelmann spruce (Picea engelmannii Parry ex Engelm.), thinned at age 10 to 9- and 15-foot spacings, was measured in eastern Oregon. Both basal area and total cubic volume increment per acre increased at the narrower spacing while diameter growth per tree was less than at the wider spacing. Height growth was not affected by spacings. Larch grew about twice as fast as spruce in height and diameter resulting in the development of a stratified two-storied stand.

For the western spruce budworm populations studied, day-to-day survival rates were close to constant in the interval from instar IV to residual pupae. In any given crown stratum, host-tree species, and site, day-to-day changes across this interval could be approximated very closely by the Malthusian equation Nt = N0eαt.

Provides current information on lumber and plywood production and prices; employment in the forest industries; international trade in logs, lumber, and plywood; volume and average prices of stumpage sold by public agencies; and other related items.

Provides current information on the lumber and plywood production and prices, employment in the forest industries, international trade in logs, lumber, and plywood, volume and average prices of stumpage sold by public agencies, and other related items.

Provides current information on the lumber and plywood production and prices; employment in the forest industries; international trade in logs, lumber, and plywood; volume and average prices of stumpage sold by public agencies; and other related items.