Treesearch

An appraisal of taiga (the northern forests of interior Alaska) environment research opportunities and needs was made based upon accomplishments since Alaskan statehood, current involvement of citizens in resource issues, information needs incident to the National Environmental Policy Act of 1969, and needs of new resource managing agencies and changing ownerships brought about by statehood and the settlement of aboriginal land claims. Based upon this appraisal, it is proposed that the research needs can best be met through a ultidisciplinary interagency program. The program suggests...

A sequence of events is necessary for natural regeneration in the pumice soil region: Adequate seed must be probed and distributed over the area, germination must be favored by warm and moist surface soils, daily surface temperature variation must be moderate, seedlings must survive summer drought, and weather conditions must prevent severe frost heaving the fall after germination and the next spring. This sequence does not always occur within a reasonable time after cutting, and natural regeneration is often delayed. Four possibilities are open to the land manager: (1) declare as noncommer...

Interpretation is in large part education, since it attempts to convey information, concepts, and principles while creating attitude changes and such emotional states as wonder, delight, and appreciation. Although interpreters might profit greatly by formal training in the principles and techniques of teaching, many have not had such training. Some means of making the insights of educators available to interpreters seemed essential. Therefore, the Environmental Interpretation Research Project arranged for F. David Boulanger and John P. Smith to write this booklet. Although the authors draw...

Between 1945 and 1970, nearly 1 million acres of commercial forest land: in Oregon and Washington were converted to nonforest uses. Road construction was the leading cause; urban and industrial expansion the second most important cause. Other significant causes of forest loss were agricultural clearing, powerline clearing, and construction of reservoirs and other bodies of water. An additional 362,000 acres of commercial forest have been set aside in reserved areas. Several changes in the ownership pattern of forest land have occurred, including an increase in National Forest and forest...

Increased public concern about pesticides requires that foresters reduce drift and insure precise application of herbicides to the areas requiring treatment. Drift control is necessary near waterways and other ecologically sensitive areas. This publication discusses available drift control adjuvants for herbicidal sprays. These include invert emulsions, thickening agents, particulating agents, and foam sprays. Commercially available adjuvants are described and their use, advantages, and disadvantages are discussed. Thickening agents and foam sprays show special promise for drift reduction...

This report makes available data on the volume and characteristics of logging residue resulting from 1969 logging operations in Oregon, Washington, and California. The results indicate highest volumes of logging residue are found in the Douglas-fir region of western Oregon and western Washington. Average gross volume of residue in this region ranged from 4,548 cubic feet per acre on National Forest land to 1,491 cubic feet per acre on private land; net volume averaged 3,127 and 1,328 cubic feet per acre, respectively. Total net volume for all owners in this region was estimated to be about...

Case histories of five tussock moth outbreaks that occurred in California and Oregon between 1935 and 1965 are discussed. Information is given on the size and duration of the outbreaks, the presence of natural control agents and the damage caused. Most of the outbreaks were eventually treated with DDT. However, enough information was available from untreated portions to show the probable trend of natural events in the absence of direct control. Repeated patterns observed in each of the outbreaks enabled certain generalizations to be made about natural population behavior and tree impact.All...

Chlorogenic acid was identified in the foliage of Douglas-fir during the dormant season. Concentrations varied among genotypes and ranged between 75 and 390 p.p.m. in the fresh tissue.

Total above-ground production was evaluated in 28 natural alder thickets, aged 1 to 14 years. On a per acre basis; mean annual production varied from 3 to more than 20 tons of green wood per acre. Such yields warrant preliminary trials of short-rotation cultural systems with red alder.

The combustion products (smoke) from forest wildfires or prescribed burns are often considered on a par with any other emission that might affect air quality. But enough is known about smoke from woody fuels to indicate that its importance is limited almost entirely to visibility obstruction, an effect that can be minimized by proper timing and preparation for burning. Much of the organic matter in smoke from forest fuels is similar to material normally entering the atmosphere from vegetative life or from the decomposition of vegetative matter. Fire compresses these processes into a...