Treesearch

Available information on inventory, growth, price, and consumption trends for western redcedar in Western United States is compiled. The future of western redcedar as a product resource and component of the forest is discussed.

A 51-yr record of observations in stands planted at six spacings, ranging from 4 to 12 ft, illustrates clearly the beneficial effects of wide initial spacing and the detrimental effects of carrying too many trees relative to the size to which they will be grown. Not only are trees larger, but yields per acre are greater at wide spacings.

This paper is a checklist of 277 vascular plant taxa that have been collected or encountered in Abbott Creek Research Natural Area, Oregon; a brief description of five forested and two nonforested vegetation types is included.

This case study tested the common belief that grass seeding is needed to prevent erosion after areas are clearcut in the Blue Mountains. Changes in the soil surface height at about 500 points each in a seedbed and an unseeded area were measured on four dates covering a 20-month period. Average vertical displacement was not consistently related to seeding nor to degree of disturbance. Variability of vertical displacement within areas treated alike was almost as great as variability between treatments. Size-graded fluorescent material (Willemite) was placed on 10 sites to characterize...

Five series of photographs display different forest residue loading levels, by size classes, for areas of like timber type (Sierra mixed conifer and Sierra true fir) and cutting objective. Information with each photo includes measured weights, volumes and other residue data, information about the timber stand and harvest actions, and assessment of fire behavior and suppression difficulty. These photo series provide a fast and easy-to-use means for quantifying and describing existing and expected residues.

Edge can be a measure of overall diversity of any area. Diversity is considered as inherent (community/community) edge, induced cessional stage/successional stage) edge and total edge. Size of stands are related to expected wildlife diversity.

Southeastern Oregon has a variety of fish habitats which include major rivers, tributary streams, large and small reservoirs, lakes, and springs. These habitats are directly related to and highly dependent on the conditions of the surrounding rangeland watersheds. Satterlund (1975, p. 22) put it this way: "Rangelands may yield little water, but they are second only to cultivated lands as a source of water quality problems." It may be fairly stated, therefore, that man's agricultural activities in rangelands of southeastern Oregon have altered aquatic habitats more than any other land use.

Riparian zones can be identified by the presence of vegetation that requires free or unbound water or conditions that are more moist than normal (fig. 1) (Franklin and Dyrness 1973, Minore and Smith 1971). Riparian zones can vary considerably in size and vegetative complex because of the many combinations that can be created between water sources (fig. 2) and physical characteristics of a site. Such characteristics include gradient, aspect, topography, soil, type of stream bottom, water quality, elevation, and plant community (Odum 1971). All riparian zones within managed rangelands of the...

This report supplements a slide-tape presentation of the same title. Part I of the report describes the current practice of nitrogen fertilization of Douglas-fir forests in western Washington and Oregon and the effects of this fertilization on tree growth and water quality. Part II discusses factors that affect costs and revenues from investments in forest fertilization. The appended tables, figures, and work sheet enable the user to prepare a break-even economic analysis for fertilization projects. This information should be useful in selecting stands for fertilization and in preparing...

Preliminary tables for estimating dry weights of whole trees and of crown components are presented for California blackuoak and tanoak; total tree weight only for Pacific madrone. Crown component weights were generated from data of two earlier studies, one from the Appalachians and one from the Pacific Northwest.