Treesearch

SIMSAP and SlMTlM are computer programs that have been developed to simulate the stand growth and development of natural and treated evenaged northern hardwood stands. SIMSAP begins with species distributions by quality classes in sapling stands after regeneration. SIMTIM, the poletimber-sawtimber-harvest phase, uses stocking guides based on quadratic mean stand diameter, number of trees, and basal area per acre of trees in the main crown canopy. Using available data, the connecting phases of the models have been tested to determine the effects of silvicultural treatments (or no treatment)...

Forest floor samples were collected from four hardwood forest stands in West Virginia to study species composition, abundance, and distribution of vegetation that originated from seeds, rootstocks, rhizomes, and so on. The abundance and distribution of plants on square-foot sections of forest floor that were lifted and moved to the greenhouse indicate that under the most ideal conditions upwards of 800,000 stems per acre may occur during the first year. Sweet birch was the most abundant tree species, blackberry the most abundant shrub, and species of violets were the most abundant herbaceou...

Describes an equation that can be used to estimate yarding costs for the Clearwater yarder in clearcuts and light and heavy thinnings in eastern hardwoods. Yarding costs can be estimated with a hand-held calculator or the data can be incorporated into stump-to-mill desktop and mainframe computer programs.

Recent analysis of forest stand losses to gypsy moth has provided basic information for analyzing the relationship between forest site productivity and tree mortality on new frontiers of infestation. Poor timber-growing sites had the lowest rates of mortality. Oak mortality (number of trees) amounted to 18 percent on poor sites compared with 26 percent on medium and 28 percent on good sites.

Presents guidelines for estimating potential tree mortality associated with gypsy moth defoliation. A tree's crown condition, crown position, and species group can be used to assign probabilities of death. Forest-land managers need such information to develop marking guides and implement silvicultural treatments for forest trees threatened with gypsy moth infestation.

A recent study of forest stand losses to gypsy moth has provided basic information for evaluating the benefits of control on new frontiers of infestation. Protecting highly susceptible trees from impending attack can prevent a potential loss of 15 percent in their timber value and 2.8 percent in their compound rate of value growth.

Analysis of species composition, stand density, and diameter distribution in five climax or old-growth stands in New Hampshire indicates that the northern hardwood climax is characterized by at least 65 to 70 percent tolerant hardwoods, 130 square feet basal area per acre, and "q" ratios (2-inch diameter classes) of 1.3 to 1.4. Climax sprucehemlock have at least 70 percent tolerant softwoods, 180 to 200 square feet basal area per acre, and "q's" of 1.5 to 1.6.

Timber harvesting costs for New Hampshire from 1964 to 1983 were examined. During this period, real harvesting costs for sawtimber decreased at an average annual rate of 1.2 percent, while stumpage prices increased. Real harvesting costs for pulpwood declined at a 0.8 percent average annual rate. Harvest cost data for fuelwood were available only for 1973 to 1983. During this period, real harvesting cost increased at an average annual rate of 3.2 percent.

Although the number of visitors to New Hampshire stateowned historic sites has declined during the last 20 years, the results of a survey indicate that most respondents are satisfied with the level of services provided. The majority of visitors indicated that historic sites need not be "self-supporting"; they were willing to pay an entry fee and did not object to donation boxes. Seventy percent indicated that the current $2.00 entry fee was reasonable.

A statistical report on the first forest wildlife habitat survey of Vermont (1983). Findings are displayed in 67 tables covering forest area, landscape patterns, mast potential, standing dead and cavity trees, and lesser woody stemmed vegetation. Data are presented at county and/or unit and state levels of resolution.