Treesearch

Results of a study to determine the relationship between physical characteristics of Adirondack lakes and variations in peak boat-use intensity indicated that 69 percent of the variation in peak use can be accounted for by the number of public and commercial boat-launching facilities per mile of lake shoreline. Other lake characteristics related to peak boat use were: the number of commercial overnight accommodations available, number of boat slips, lake size, and miles of lake shoreline. Lake characteristics not related to peak use were: accessibility, configuration, tent spaces available,...

The recently-released Timber Resources Review forecasts increasing demands for wood and wood products through the end of this century. If these demands are to be met, particularly in view of a shrinking forest-land base, then widespread use of intensive culture must ultimately be adopted. Two cultural techniques being looked at more and more closely as ways of increasing productivity are the use of genetically-improved planting stock having the ability to produce more wood than is obtainable from wildland populations, and the application of fertilizers to nutrient-deficient forest sites....

American elm trees, Ulmus americana L., were sprayed with methoxychlor by helicopter or mist blower, and twig crotches were collected from sprayed trees for bioassay of Scolytus multistriatus (Marsham) and GLC assay. Correlations established between the 2 assays were dependent on method of application and amount of methoxychlor residue. Correlations were low and variable for helicopter-sprayed trees and high and uniform for mist-blower-sprayed trees.

To evaluate fall versus spring planting of 10 coniferous tree species and 5 hardwood shrub species, experimental plantings were established over a 2-year period on 7 graded strip-mine spoils. In general, initial tree survival was better with spring planting than with fall planting, especially on the more acid sites. Shrubs survived well with both spring and fall planting on the better sites, but spring planting of shrubs was more successful on the more acid sites. Season of planting had no significant effect on fifth-year height of either trees or shrubs.

Red pine (Pinus resinosa Ait.) and Japanese larch (Larix leptolepis (Sieb. and Zucc.) Gord.) seedlings were planted on coal-breaker refuse with all combinations of two levels of lime, two levels of fertilizer, and four mulch treatments. The site was highly unfavorable as a medium for tree growth, and the 4-year results show that: lime application was essential for adequate survival and establishment of both species; neither mulch nor fertilizer treatments contributed substantially to tree establishment and height growth; and after 4 years, the pH values are still neutral in the top 4 in....

A multiple-variable screening technique, AID, was used to explain the forest-product-sales behavior of private woodland owners. Results provide a basis for policy-related inferences and suggest an optimal strategy for encouraging sales of forest products.

Data on lumber grade yields for subfactory class logs are presented for ten species of hardwoods. Eogs of this type are expected to assume greater importance in the market. The yields, when coupled with lumber prices, will be useful to sawmill operators for developing log prices in terms of standard factory lumber.

The authors present a method for projecting hardwood sawtimber tree values, using tree-development probabilities based on continuous forest inventory (CFI) data and describe some ways to use the resulting value projections to assemble management-planning information.

Five years after crop-tree release of yellow-poplar and black cherry sterns in a 7-year-old stand of Appalachian hardwoods, measurements indicated that released trees were but slightly superior to control trees in height, diameter, and crown position. Sprout regrowth of cut tree stems and grapevines had largely nullified the effects of release. Indications are that for release to be effective, crop trees of these species on good sites should be 15 to 20 feet tall.

A study of the camping market's short-term growth potential, based upon interviews with the heads of 2,003 representative American households. The study estimates the size of the potential camping market and divides it into three segments: those families with a high, medium and low propensity to become campers. The developed camping market is also divided into an active and an inactive segment, determined by camping participation during the 12 months preceding the survey. The total camping market is estimated to include 12.6 million active camping families, 9 million inactive, and 10...