Treesearch

Cao's compatible, segmented polynomial taper equation (Q. V. Cao, H. E. Burkhart, and T. A. Max. For. Sci. 26: 71-80. 1980) is fitted to a large loblolly pine data set from the southeastern United States. Equations are presented that predict diameter at a given height, height to a given top diameter, and volume below a given position on the main stem. All estimates are inside bark. A condition is given that forces the Cao model to be exactly compatible with any total main stem volume equation. An exact volume estimation formula is derived. Twelve benchmarks, which represent realistic...

Describes a model for predicting moisture content of fine fuels for use with the BEHAVE fire behavior and fuel modeling system. The model is intended to meet the need for more accurate predictions of fine fuel moisture, particularly in northern conifer stands and on days following rain. The model is based on the Canadian Fine Fuel Moisture Code (FFMC), modified to account for solar heating of fuels and to predict diurnal trends in fine fuel moisture. The model may be initiated without extensive data on prior weather. When compared to the FFMC and the fire behavior officers' procedures, the...

Three alternatives using digital thematic mapper (TM), analog TM, and a combination of either digital or analog TM data with low altitude photography are discussed for level I and level II land use/land cover classes for a proposed national inventory. Digital TM data should prove satisfactory for estimating acreage in level I classes, although estimates of precision may be unreliable. Either the digital or the analog TH combined with low-altitude photography (LAP) are expected to yield satisfactory estimates for most level I and level II classes. Reliable estimates of precision can be...

Discusses fire as an ecological factor for forest habitat types occurring in central Idaho. Identifies "Fire Groups" of habitat types based on fire's role in forest succession. Considerations for fire management are suggested.

Describes a method for appraising fuels and fire behavior potential in aspen forests to guide the use of prescribed fire and the preparation of fire prescriptions. Includes an illustrated classification of aspen fuels; appraisals of fireline intensity, rate of spread, adjective ratings for fire behavior and probability of burn success; and evaluations of seasonal change in live fuel moisture contents.

Pronghorn antelope are important components of grassland and steppe ecosystems in Wyoming. Monitoring data on the size and population dynamics of these herds are expensive and gathered only a few times each year. Reliable data include estimates of animals harvested and proportion of bucks, does, and fawns. A deterministic simulation model has been used to improve estimates of population size. Expert judgement is employed for initial estimates of natural mortality; adjustments are made until the simulation satisfactorily agrees with field data.

CHEAPO II provides supplemental economic analysis capability for users of version 5.1 of the Stand Prognosis Model, including recent regeneration and insect outbreak extensions. Although patterned after the old CHEAPO model, CHEAPO II has more features and analytic capabilities, especially for analysis of existing and uneven-aged stands.

Survival was highest and height growth greatest in ponderosa pine provenances from northcentral Nebraska, southwest South Dakota, and the High Plains region. Genotype x environment interaction was minimal in central and northern Great Plains plantations. Age/age correlations indicate provenances expressing superior height growth can be identified after 5 or 10 years.Dataset for this publication

The pursuit of recreational activities inevitably has an effect on the resource--vegetation, soil, wildlife, and water. Whether these impacts are considered to be positive or negative depends on the management objectives of the area affected. The severity of the positive or negative response, which dictates the acuteness of the need for mitigation measures, is also influenced by management objectives. Generally, the problems associated with a given level of impact increase as we move from the more urban and developed end of the recreational opportunity spectrum toward the primitive and...

Twenty-two campsites in the Eagle Cap Wilderness were examined in 1979 and then reexamined in 1984 to compare the extent of ecological impacts. Of the 22 campsites, six had received low use, six moderate use, and 10 high use, Of the high-use sites, six had been closed to use in the late 1970’s by a regulation prohibiting camping within 200 ft (61 m) of lakeshores. This stratification made it possible to evaluate whether or not change over time was related to amount of use. It was also possible to evaluate the effectiveness of campsite closures in promoting recovery.