Treesearch

The Soil Conservation Service is in the early stages of testing many species of Eucalyptus or windbreaks. Over 260 different species have been collected. The pre-planting selection criteria and process is described as well as the test conditions and procedures. Some sources of information on the use of the Eucalypts may be misleading through overgeneralization. Early results support the need for greater communication and testing of a wide variety of species and provenances in California.

California was settled in an era before the full impact of the industrial revolution that was taking place in Great Britain was fully realized, a revolution that was to change the course of western culture more drastically than any previous time in history. Friedrich Engels wrote in 1845 of the industrial revolution as "a revolution which at the same time changed the whole of civil society, and the significance of which for the history of the world is only now beginning to be understood" (Tucker 1972). Society of today tends to forget the needs of the historic peoples before machinery,...

To provide up-to-date information on Eucalyptus in California, researchers from Califor-nia, Florida, Hawaii, Oregon, and France presented papers on species selection, products, uses, and economics, growth and yield, cultural requirements, propagation, and breeding programs. This Proceedings of the Workshop should serve as a useful reference for landowners, foresters, nurserymen, horticulturists, and others who are planning to plant Eucalyptus.

Recent reviews have suggested that tree species are the most variable of organisms, as measured by proportion of polymorphic loci or average heterozygosity (Hamrick, 1979; Hamrick et al., 1979). Average heterozygosity is greater than 0.30 for several conifers. By contrast, annual herbaceous species have a mean heterozygosity of 0.13 (Hamrick et al., 1979).

The connection between fitness and heterozygosity has eluded geneticists for decades. The classic form of the Neo-Darwinian argument hypothesizes that heterozygosity confers genetic homeostasis (Lerner, 1954); i.e., multiple, molecular forms of the same enzyme endow the organism with a broader range of tolerance to environmental variation because different forms may differ in their optima for temperature, pH, and other factors (Johnson, 1976). In maize (Zea mays L.), inbred lines and their hybrids are similar in growth rate when raised under constant u conditions at optimal temperatures,...

This historical sketch is presented as a Volunteer in National Forest project. It was started in November, 1982 when then Director Robert Callahan asked me if I would be interested in researching and writing a history--both factual and anecdotal. It is definitely not definitive but I think it adequately sketches the acquisition period, with names of the principal people involved; the established period and building construction; and the timber harvesting with planned research and reporting of results.

A fundamental difference between a canal and a natural stream is structure. Structure includes all the typical anomalies of natural streams that deflect the general downstream flow, such as bends, bars, bedrock knobs, boulders, landslide deposits, and large woody debris. This results in the storage of watershed products in the channel, and in a great heterogeneity in depth, velocity, stream gradient, and substrate conditions. In this paper, I will discuss these functions of structure in salmon habitat and some implications for restoration of habitat.

Abstract - Landslides related to clearcut logging are a significant source of erosion in the mountains of northwestern California. Forest managers, therefore, frequently must include assessments of landslide risk in their land-use plans. A quantitative method is needed to predict such risk over large areas of rugged mountainous terrain. From air photographs, data were collected of conditions associated with a sample of logging-related slides and randomly located stable sites. Discriminant analyses were used to develop an equation that distinguishes the two types of sites-slide and non-slide...

Professional and official attitudes and reports discourage the use of exotics in the North-west. Not only will the small woodland owner fail to make a reasonable return on his investment in growing native trees, he may not live long enough to harvest a crop. Short rotation alternatives are sought by using certain species of Eucalypts. Adaptability of such species is sought by out-planting plots in Douglas County. Considerable data has been accumulated on cold tolerance, survival, juvenile growth and deer damage to the species planted. Certain species appear to be adapted in southwest Oregon.

A procedure has been developed for estimating the economic cost of initial attack and large-fire suppression. The procedure uses a per-unit approach to estimate total attack and suppression costs on an input-by-input basis. Fire management inputs (FMIs) are the production units used. All direct and indirect costs are charged to the FMIs. With the unit approach, all cost information relevant to an FMI is integrated as one cost rate, thereby making simulation cost aggregation easier. Also, flexibility is increased so that the cost procedure can be uniformly applied by all organizations with...