Treesearch

Data collected in conjunction with the multiresource inventory of southeast Alaska in 1985-86 included downed wood along 234 transects at 60 locations. Transects occurred in 11 forest types and 19 plant associations within the entire southeastern Alaska archipelago. Downed wood weights in forest types ranged from 1232 kilograms per hectare (0.6 ton per acre) in muskeg (shore pine) stands to 117 483 kilograms per hectare (52.4 tons per acre) in western redcedar stands. In plant association terminology, downed wood weights ranged from 3115 kilograms per hectare (1.4 tons per acre) in the...

A protocol for sampling forest canopy gaps is presented. Methods used in published gap studies are reviewed. The sample protocol will be useful in developing a broader understanding of forest structure and dynamics through comparative studies across different forest ecosystems.

Scientific, management, and social factors that have contributed to changes in United States forest management are examined. Principles underlying new approaches are developed and implications are considered at various spatial and temporal scales. A general framework for a research program is outlined.

Economic implications of critical habitat designation (CHD) for salmon in the Columbia River basin were estimated in advance of actual designation and recovery plan development. Economic impacts on Pacific, Northwest, Intermountain, and Northern Region National Forests' range, recreation, timber, and mineral programs in the Columbia and Snake River basins were analyzed. Two cases were considered: a worst case, where CHD results in a total reduction in the anadromous portions of the various programs, and a mitigated case, where all or part of the loss is mitigated. Results were analyzed...

Field tests of the load-carrying capacity of epoxy-grouted rock anchors in poor quality bedrock on Wrangel Island in southeast Alaska demonstrated the effectiveness of rock anchors as substitutes for stump anchors for logging system guylines. Ultimate capacity depends mainly on rock hardness or strength and length of the imbedded anchor.

This publication presents a Landscape Design and Analysis Process, along with some simple methods and tools for describing landscapes and their function. The information is qualitative in nature and highlights basic concepts, but does not address landscape ecology in great depth. Readers are encouraged to consult the list of selected references in Chapter 2 if they wish a more extensive background.There are many unanswered questions about how landscapes operate as ecological systems. Those who attempt to carry out the Landscape Analysis and Design Process should expect to identify a number...

Variation in speed of seed germination was investigated among ponderosa pine trees representing 225 locations in central Oregon. Results suggested that at least some of the geographic variation is related to the severity of summer drought. In general, germination speed was greater in locations with shod, drought-limited growing seasons. Levels of geographic variation were highest in the region having the steepest precipitation gradients. Most of the variation occurred, however, within locations.

Grade-specific price projections were developed for Douglas-fir, coast hem-fir, inland hem-fir, and ponderosa pine lumber. These grade-specific price projections can be used in evaluating management practices that will affect the quality of saw logs produced under various management regimes.

Unrecognized genotype x environment interactions (g,e) can bias genetic-gain predictions and models for predicting growth dynamics or species perturbations by global climate change. This study tested six sets of families in 10 plantation sites in a 78-thousand-hectare breeding zone. Plantation differences accounted for 71 percent of sums of squares (15-year heights), replications an additional 4.4 percent, families 1.9 percent, the first principal component of interaction effects 3.5 percent, and the second principal component 1.2 percent. Results in this study and in a larger survey (87...

Forest inventory data collected in 1987 fTom sample plots established on the Kenai Peninsula were analyzed to provide point-in-time estimates of the trend and current status of a spruce beetle infestation. Ground plots were categorized by stage of infestation. Estimates of numbers of live and dead white spruce trees, cubic-foot volume in those trees, and areal extent of infestation were developed and are presented for each stage of infestation.