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Emission reduction has become an essential part of the effort to reduce air pollution from forest slash burning. The State of Washington has set a goal of reducing emissions by 35 percent by 1990, leaving the choice of emission reduction techniques to forest managers. Several thousand harvested areas are burned each year in the Northwest, encompassing a wide variety of physical and meteorological factors that determine the mass and duration of each pollutant source. Each burn is somehow unique; and no emission reduction technique is uniformly effective. A source strength model has been...

This paper describes an interactive policy analysis simulation system(IPASS) that can be used to analyze the long-term economic and demographic effects of alternative forest resource management policies. The IPASS model is a dynamic analytical tool that forecasts growth and development of an economy. It allows the user to introduce changes in selected parameters based on different assumptions about socioeconomic variables. The user can analyze the impact those changes would have on the economy by comparing results of the alternative situation with the original forecast. The program is...

A modified version of the DFSIM Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) growth and yield simulator, DFSIM WITH ECONOMICS, now has an economics option that allows the user to estimate present net worth at the same time a silvicultural regime is simulated. If desired, the economics option will apply a volume adjustment multiplier in yields used in the analysis to reflect application of small-plot research results to average operating conditions or to account for genetics or other local conditions..It can also account for salvage of mortality. Prices can be entered...

Preliminary information on general landscape patterns in southeast Alaska suggests that two major, compositionally distinct vegetation zones can be defined for the closed-forest type: western hemlock-Sitka spruce/Alaska huckleberry/bunchberry on the uplands, and Sitka spruce/devils club-salmonberry on alluvial flats and terraces. Recent clearcuts (0 to 30 years old) produce the most shrubby vegetation of any age class in the forest succession. Even-aged forests (30 to 150 years old) produce the least understory vegetation. Uneven aged, old-growth forests sustain the most structurally...

Methods and procedures are given for collecting and processing living and dead plant materials for the purpose of determining their water content. Wild-land fuels in Alaska are emphasized, but the methodology is applicable elsewhere. Guides are given for determining the number of samples needed to attain a chosen precision. Detailed procedures are presented for collecting fuel samples in the field, transporting them safely, and handling them in the laboratory. General guidelines for all live fuels and specific techniques for individual species are given.

Historical development of western redcedar (Thuja plicata Donn) trees and stands, 46 to 58 years old, was analyzed on four upland sites in western Washington.

This report presents the findings of a 100-percent survey of the primary forest products industry in Oregon for 1982. The survey included the following sectors: lumber; veneer and plywood; pulp and board; shake and shingle; export; and post, pole, and piling. Tabular presentations include characteristics of the industry, nature and flow of logs consumed, and disposition of mill residues, by sector and for the industry as a whole.

Height growth and site index curves and equations are presented for unmanaged even-aged stands of western hemlock and Sitka spruce in southeast Alaska. Data were mostly collected in stands that developed after logging.

This report presents the findings of a 100-percent survey of the primary forest products industry in California for 1982. The survey included the following sectors: lumber; veneer and plywood; pulp and board; shake and shingle; export; and post, pole, and piling. Tabular presentations include characteristics of the industry, nature and flow of logs consumed, and disposition of mill residues, by sector and for the industry as a whole.

Effects of wrenching Douglas-fir seedlings in August of their second season in the D. L. Phipps State Forest Nursery, Elkton, Oregon, were determined by periodic samplings to learn of changes in phenological, morphological, and growth characteristics. Initial effects of wrenching moderated by January when seedlings were lifted; both wrenched and unwrenched seedlings had grown substantially larger. Survival and growth of seedlings were good during the first 5 years after outplanting in droughty skeletal soil on southeast and northeast slopes in the South Umpqua River drainage of southwestern...