Treesearch

Increasing germination of Sophora chrysophylla seed over current levels is an important step in reforesting portions of the mamane-naio forests on the slopes of Mauna Kea, Hawaii. Three types of seedground, old pod, and new pod, were collected at four different sites and shipped to the U.S. Forest Service's Eastern Tree Seed Laboratory, Macon, Georgia, for germination tests. Seeds were subjected to three stratification regimes-cool-wet, cool-dry, and no stratification. Six seed coat treatments were applied to stratified seed: add soak, mechanical scarification, hot water soak, dry heat,...

In 1961 a feasibility study was done to determine if certain Eucalyptus species could be grown along the California North Coast for timber or ornamental purposes. Of the 207 trees, representing 31 species, planted on the Redwood Experimental Forest, only 12 trees in 5 species were recorded in the 1976 survival examination. The single most damaging factor was frost. More than 40 percent mortality was attributed to the 1972 freeze.

A sealed-edge pyramidal trap to sample total insectemergence from a segment of a small stream has been designed and tested in northeastern Oregon. The trap is approximately 10 by 10 feet at the base, and is constructed of wood, clear plastic, and galvanized screening. It is efficient and readily used, and can yield significant data on seasonal population changes and on the environmental impact of insecticides.

In a sampling of 32 logged areas in red fir forests of northern California, 58 plant species were found. Species corresponded with less than one-fifth of the 93 species reported in an earlier study of the virgin forest. Sampling of uncut areas adjacent to cuttings does not seem useful for predicting the earlier successional vegetation that will appear when the areas are logged.

Disturbance and high mortality related to human activity have apparently caused the decline of the condor population to about 50 birds. Failure to reproduce successfully is now the central problem; inadequate food supply near nest sites, lack of nest sites in new concentration areas, and pesticide accumulation in condor tissues are possible causes. Low reproductive rate hinders the recovery effort. Results of population modeling indicate that a minimum of eight nesting attempts each year is needed to maintain a population of at least 50; field data indicate that an average of only 1.8...

Dispatching of firefighting resources requires instantaneous or precalculated decisions. A FORTRAN computer program has been developed that can provide a list of resources in order of computed arrival time for initial attack on a fire. The program requires an accurate description of the existing road system and a list of all resources available on a planning unit.

Quantitative techniques may be applied to aid in completing various phases of land management planning. Analytical procedures which have been used include a procedure for public involvement, PUBLIC; a matrix information generator, MAGE5; an allocation procedure, linear programming (LP); and an input-output economic analysis (EA). These techniques have proven useful in the development of lane management plans for a number of National Forests in the United States.

Computer modeling has been extensively adopted for Australian forest planning over the last ten years. It has been confined almost entirely to the plantations of fast-growing species for which adequate inventory, growth, and experimental data are available. Stand simulation models have replaced conventional yield tables and enabled a wide range of alternative strategies to be evaluated for each individual stand. Simulation models for entire plantations have been found invaluable for the preparation of 1-to 5-year cutting plans and for regulating the yield over 20- to 60-year periods. Many...

The redwood and Douglas-fir region of the Coast Range and Klamath Mountains in northwestern California covers an area extending from the California Oregon border south to about 100 miles above San Francisco. The area provides more than 40 percent of California's timber products, 37 percent of its streamflow, and the most valuable habitat for salmon and steelhead trout in the State. But management of these important resources presents major problems. One difficulty is that natural landslides commonly occur, eroding slopes and depositing enormous amounts of sediment in streams. The role that...

Summary - It has been found that two instruments will yield different numerical values when used to measure identical points. A statistical approach is presented that can be used to approximate the error associated with the calibration of instruments. Included are standard statistical tests that can be used to determine if a number of successive calibrations of the same instrument can be considered to be the same curve, or if they are different. Essentially, these tests involve the determination of regression lines that have both a common slope and common intercept. The example was...