Treesearch

A technique is described for using stereo photography to evaluate tree quality changes over time. Stereo pairs were taken four times over an 18-year period. All four faces of the selected trees were photographed. Individual defect changes are shown for young upland white oak trees.

The increased demand for firewood threatens the habitat of many wildlife species. Dead or dying trees that commonly are cut for firewood are vital to wildlife species that nest in tree cavities. Likewise, healthy trees of many species preferred for firewood are important components of wildlife habitat. Tree species or species groups are value-rated for both firewood and wildlife so that the ratings can be used to decide how to manage a woodland for fuel and wildlife.

Sawtimber and cordwood prices (1978) and the range in price per unit from sales on nonindustrial private woodlands are reported for the Northern United States and subareas.

A water vapor mass balance technique that includes the use of common humidity-control equipment can be used to determine average air infiltration rates in buildings. Only measurements of the humidity inside and outside the home, the mass of vapor exchanged by a humidifier/dehumidifier, and the volume of interior air space are needed. This method gives results that compare favorably with those obtained with standard methods that include the use of CO2 as a tracer gas.

This state-of-the-art management guideline describes the importance of knowing backcountry use patterns and the questions that should be asked before embarking on a use-monitoring program. It summarizes information about six techniques for monitoring use of backcountry trails and provides practical information about site suitabilities, installation and maintenance requirements, equipment costs, and data analysis considerations of each monitoring system.

A grading technique developed to predict the yield of furniture squares and random-width stock from flitches is presented.

The painted hickory borer, Megacyllene caryae (Gahan) and the locust borer Megacyllene robiniae (Forster) will not attempt to interbreed in the laboratory. However, male locust borers copulated with painted hickory borer females painted with an alcohol extract of female locust borers. No eggs were laid by treated or untreated beetles, though females were full of eggs. A bacillus disease may have prevented egg deposition.

The average width of a trail was used to predict trail use in an urban forest recreation area. Results show that width indicates use only very generally at best. Consequently, simply inspecting the physical condition of a trail may lead to erroneous conclusions about its use. Managers requiring more than a simple light use/heavy use classification should adopt more elaborate schemes to determine use levels.

Equations and tables for estimating the cubic-foot volumes of lumber, sawdust, and sawmill residue for black cherry trees are presented. Also included are cubic-foot and board-foot predictions for the sawlog portion of the trees.

Changing land use often results in removal of the existing forest cover. During a resurvey of Maryland's timber resources, a study was conducted to measure the losses of wood fiber attributable to forest-land clearing. An estimated 107 million cubic feet of growing stock were destroyed on 164,000 acres of commercial forest land cleared between 1961 and 1972. For fuel purposes, this represents a gross energy loss of 24.1 trillion Btus. Much of the recovered industrial wood came from forest lands cleared in rural areas, and much of the recovered firewood came from forest lands cleared in...