Treesearch

KRISSY is a computer model for generating three-dimensional wind flows in complex terrain from data that were not or perhaps cannot be collected. The model is written in FORTRAN IV This guide describes data requirements, modeling, and output from an applications viewpoint rather than that of programming or theoretical modeling. KRISSY is designed to minimize meteorological requirements―particularly for upper air data. It also includes a program option that derives vertical motion from a solution of the wave equation with momentum conservation. KRISSY differs from other mass-conserving wind...

Chaparral is the dominant vegetation in the wildlands of central and southern California. It has evolved fire adaptions that make it flammable and trigger postfire regeneration, thereby ensuring plant community rejuvenation. To provide a framework for chaparral-related research and accelerate development and demonstration of urgently needed management techniques, the Forest Service, in 1976, began a 5-year research and development program. The Vegetation Management Alternatives for Chaparral and Related Ecosystems Program was organized by the Pacific Southwest Forest and Range Experiment...

Giant sequoia (Sequoiadendron giganteum [Lindl.] Buchholz) has long been noted for its size and beauty. It is widely planted as an ornamental and increasingly is being utilized for timber production. The workshop was the first ever designed to bring together the state-of-knowledge on giant sequoia and its management. Presentations covered its history, silvics, genetics, growth and yield, wood properties and products, insect and disease relationships, and management strategies. The proceedings are a useful reference for resource managers, foresters, naturalists, ecologists, and the intereste...

FIRECAST is a computer program that estimates fire behavior in terms of six fire parameters. Required inputs vary depending on the outputs desired by the fire manager. Fuel model options available to users are these: Northern Forest Fire Laboratory (NFFL), National Fire Danger Rating System (NFDRS), and southern California brushland (SCAL). The program has been operationally tested for use in the State of California. Complete operating instructions are given along with a description of program components and a complete sample run.The original FORTRAN code is available in the Forest Service...

Ecological relationships-including habitat and life history---of giant sequoia (Sequoiadendron giganteum [Lindl.] Buchholz) in natural stands are summarized. Such silvical information provides an important foundation for sound management of the species.

A European ferret, Mustela putorius furo, was fed typical marten food items to discover the relationship between prey weight and number of scats produced per unit weight of prey. A correction factor was derived that was used in the analysis of pine marten, Martes americana, scats to produce a method capable of comparing foods on a "percent-by-prey-weight" basis. The results of this analysis are compared to traditional scat analysis methods and found to differ substantially. The differences were greatest when compared to analysis by "frequency-of-occurrence".

Inappropriate statistical methods, as well as appropriate methods inappropriately used, can lead to incorrect conclusions in any research report. Incorrect conclusions may also be due to the fact that the research problem is just hard to quantify in a satisfactory way. Publication of a research report does not guarantee that appropriate statistical methods have been used, or that appropriate methods have been used correctly. Publication also does not guarantee that actual measurements are reasonably close to the underlying concept.

Evaluating economic efficiency of fire management program options requires information on the firefighting inputs, such as vehicles and crews, that would be needed to execute the program option selected. An algorithm was developed to translate automatically dollars allocated to type of firefighting inputs to numbers of units, using a set of weights for a specific fire service area. Solutions that call for fractions of inputs are resolved by a set of rules on rounding out values. The procedure is general enough to be used with any economic efficiency simulation model for evaluating fire...

Portions of the ohia (Metrosideros polymorpha) forests on the windward slopes of Mauna Loa and Mauna Kea on the island of Hawaii began dying in 1952. Little mortality has occurred since 1972. About 50,000 ha are affected by the decline. Individual trees exhibit several symptoms, from slow progressive dieback to rapid death. Seven types of decline have been identified on the basis of differential response of the associated rainforest vegetation. Two of the types, Bog Formation Dieback and Wetland Dieback, make up more than 80 percent of the decline area. The decline has affected bird...

A generalized interactive computer model that simulates and predicts insecticide efficacy, over seasonal development of western spruce budworm and Douglas-fir tussock moth, is described. This model can be used for any insecticide for which the user has laboratory-based concentration-response data. The program has four options, is written in BASIC, and can be operated on a microcomputer.