Treesearch

Estimation equations for height growth and site index were derived from stem-analysis data of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco var. menziesii) in the highelevation forests of the Cascade Range in Oregon and Washington. Two sets of height-growth and site-index estimation curves and tables produced from previously published equations are presented-one set with U.S. customary units of measure and another set with metric units. These curves and tables were designed for use in the field by forest managers.

The 20-year growth response from a levels-of-growing-stock study in an even-aged western larch stand in eastern Oregon, first thinned at age 33, showed that trees growing at low stand densities grew more rapidly in diameter than trees in high-density plots. Height growth was relatively uniform among density levels. Both basal-area and total cubic-volume increment increased as stand density increased. Despite the large reduction in volume increment at the low densities, most of the wood is concentrated on a few, fast-growing trees that can reach usable size sooner than slow-growing trees in...

Observations are presented from 4 years of record, 1976 to 1979, on behavior of mule deer (Odocoileus hemionus) in relation to site variables on the Keating Winter Range in northeastern Oregon. Analyses of animal use per unit area showed that the preferential selection of cells was related primarily to static site variables and secondarily to weather. The most regularly selected and strongest predictive variable was distance from the valley bottom, a variable generally associated with elevation. Only during the midafternoon hours of 1400 to 1600 did dynamic weather variables contribute...

Effects of P, K, Ca, Mg, S, Co, and Mo fertilizers on growth and foliar nutrients of red alder seedlings potted in Grove, Bunker, and Wishkah forest soils were determined. Growth in Grove soil was stimulated most by P, Ca, and P + Ca + Mg + K + S. Growth in Bunker soil was improved only by P. In Wishkah soil, best growth was obtained when P was used alone; all fertilizer mixtures produced less growth. Results indicated the potential of fertilizer to increase alder production and suggested caution in using fertilizer mixtures because they may materially reduce growth response.

A multivariate analysis of climate was used to delineate 10 significantly different groups of climatic stations along the southern coast of Alaska based on latitude, longitude, seasonal temperatures and precipitation, frost-free periods, and total number of growing degree days. The climatic stations were too few to delineate this rugged, mountainous region into distinct climatic zones.

A computer model that estimates the green weights of standing trees was developed and validated for old-growth Douglas-fir. The model calculates the green weight for the entire bole, for the bole to any merchantable top, and for any log length within the bole. The model was validated by estimating the bias and accuracy of an independent subsample selected from the original stand. Calculated weights were compared to actual weights as measured on truck scales. The model accurately estimated the weight of logs (less than 10 percent error) and provides an estimation technique that is expected...

The export of unprocessed timber is restricted from lands managed by the Forest Service, U.S. Department of Agriculture, and the Bureau of Land Management, U.S. Department of the Interior, in the West. In addition, the Forest Service and the Bureau of Land Management have implemented regulations to ensure that Federal timber is not substituted for private timber. The export of unprocessed timber is also restricted from lands managed by the States of Alaska, Oregon, California, and Idaho. As a result of a suit against the State of Alaska and subsequent appeals, however, the attorneys...

The international trade of forest products has generated increasing research interest, yet experience with modeling such trade is limited. Primary issues include the effects of trade barriers and exchange rates on trade patterns and national welfare. This paper attempts to add to experience by modeling hardwood log, lumber, and plywood trade in a region that has been mostly overlooked: East Asia, specifically Japan and the South Seas nations (Indonesia, Malaysia, and the Philippines). Japan-South Seas trade is important because of its significance in global forest-products trade and...

The problem of determining equilibrium prices and quantities in spatially separated markets is reviewed. Algorithms that compute spatial equilibria are discussed. A computer program using the reactive programming algorithm for solving spatial equilibrium problems that involve multiple commodities is presented, along with detailed documentation. A sample data set, program output, and a partial program listing are also provided.

A skyline-logging simulation model designed to help planners evaluate potential yarding options and alternative harvest plans is presented. The model, called SIMYAR, uses information about the timber stand, yarding equipment, and unit geometry to estimate yarding co stand productivity for a particular operation. The costs of felling, bucking, loading, and hauling are not considered. Included are a description of the input requirements for SIMYAR, descriptions of the major algorithms, suggested applications, and a discussion of limitations. A users guide is available as an appendix to this...