Treesearch

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...

From data for 114 thinning and fertilizing trials in forests of southwestern Oregon and northern California with 5 or more years of observation, we produced equations to estimate gross cubic volume growth of 10- to 70-year-old Douglas-fir stands. These equations use stand escriptors (breast-height age, site index, and relative density) and treatment descriptors to estimate annual gross volume growth during a 10-year period for untreated and treated (fertilized or thinned, or both) stands. These predictions (SWOR) were compared with other growth predictions including DFSIM, a simulation...

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 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 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.