Treesearch

This guide identifies and describes sources of economic data useful to wildland managers and planners in the Western United States. The data are categorized by six types of management activities: outdoor recreation and wilderness; wildlife and fish; range; timber; land and water; and minerals and energy. For each type of activity, data sources are identified as to costs; outputs and their monetary values; nonmonetary data and impacts; information for supply and demand analysis; and secondary and indirect effects.

Leaf, root and stem systems of loblolly pine seedlings are characterized by a seasonal periodicity in growth, during which they alternate in spurts of activity. Despite this periodicity, the allometric coefficient describing the ratio of the relative growth rates of leaf to root remains constant for at least the first two years of development. In part, constancy results from the inability of variation in the allocation of growth increment during brief periods to change a pre-existing structure accumulated over the life of the seediing. In addition, alternating periods of leaf, root and...

When I first received my plant of Drosera regia from a friend, it was a small specimen and I grew the plant in a 4-inch pot under grow-lux bulbs in my house. During the first summer, it grew reasonably well but put out only a maximum of 3-inch leaves

Organic matter in soil controls a variety of soil properties. A study in Humboldt County, California, evaluated changes in percentages of organic matter in soil as a function of time after timber harvest and soil depth in fir and redwood forests. To assess organic matter content, samples were taken from cutblocks of various ages in soil to depths of 1.33 m. Results indicate that only depth correlated significantly with organic matter in the fir forest. Depth, and to a minor extent, age, correlated significantly with organic matter content in the redwood forest. Organic matter content in...

FIRESCOPE is a system developed to improve the capability of firefighting agencies in southern California in allocating and managing fire suppression resources. The system provides an effective and efficient solution to operational coordination requirements and problems of the major fire protection agencies serving the southern California urban-wildland complex. Major wildland fires are a common annual occurrence in this Mediterranean-like climate which typically gives the area 4 to 6 months of almost total drought. In addition, the region is threatened with infrequent, but potentially...

The symposium, held at Scripps College in Southern California, addressed most aspects of California's vast oak resource. Papers represented four major subject categories: ecological relationships, silviculture and management, damage factors, and products. Both scientific and applied information was presented, including original material not published previously. Individual topics ranged from taxonomy and historical relationships to management of insects and diseases. and various oak products. In California. oaks' value for wildlife, recreation, watershed protection, and esthetics exceeds...

The relationships between 355 wildlife species and their habitats are examined in a series of matrices, life history notes, and distribution maps covering 26 amphibians, 27 reptiles, 208 birds, and 94 mammals. The information is useful in identifying and evaluating the consequences of proposed land management activities-particularly those that manipulate vegetation. Although designed for use by land managers, the publication provides information useful to both professionals and lay persons interested in California wildlife.

This user's guide provides detailed instructions for the use of POLO (Probit Or LOgit), a computer program for the analysis of quantal response data such as that obtained from insecticide bioassays by the techniques of probit or logit analysis. Dosage-response lines may be compared for parallelism or equality by means of likelihood ratio tests. Statistical features of the program, suggestions for the design of experiments that provide data for analysis, and formats for data input and output are described in detail.

The effect of logging and roadbuilding on erosion and sedimentation are analyzed by comparing the North Fork and South Fork of Caspar Creek, in northern California. Increased sediment production during the 4 years after road construction, was 326 cu yd/sq mi/yr—80 percent greater than that predicted by the predisturbance regression analysis. The average sediment load during the 3 years of logging increased by 957 cu yd/sq mi/yr—275 percent greater than the predicted values. Although the erosion or sediment increases do not appear to be degrading site quality, average turbidity levels in...

This state-of-the-art report summarizes what is known about the effects of heat on soil during chaparral fires. It reviews the literature on the effects of such fires on soil properties, availabilty and loss of plant nutrients, soil wettability, erosion, and surface runoff. And it reports new data collected during recent prescribed burns and a wildfire in southern California. From the data, stylized curves that characterize soil heating during light, moderate, and intense chaparral fires were developed. The information is useful in estimating the effects of fire on soils in chaparral...