Treesearch

Stumpage price trends in New Hampshire and Vermont varied considerably among species and products. Real stumpage price trends, expressed in 1988 dollars using the Producer Price Index to remove the effect of inflation, are reported for selected species and products. Long-term (1964-1989) trends in average annual prices are reported for New Hampshire and short-term (1981-1989) mnds in average quarterly prices are reported for Vermont.

Appropriate application of gypsy moth control strategies requires an accurate prediction of the distribution and intensity of tree mortality prior to defoliation. This prior information is necessary to better target investments in control activities where they are needed. This poster lays the groundwork for developing hazard-rating systems for forests of the Appalachian Plateau (AP) and the Ridge and Valley (R&V) by comparing the impact of gypsy moth defoliation in these two provinces.

Hardwood forests in Pennsylvania frequently develop a dense understory of hayscented fern (Dennstaedtia punctilobula (Michx.) Moore)) following partial overstory removal. Seedlings of desirable hardwood species are unable to develop in these understories. A study was conducted in a central Pennsylvania mixed oak stand to determine how hayscented fern becomes established following partial cutting.

The great demand for red oak (Quercus rubra L.) has forced plant propagators to consider viable methods of mass clonal propagation for the species. A process called 'microcoppicing' is presently being developed to help meet such needs.

A site quality evaluation decision model, developed for Allegheny hardwoods on the non-glaciated Allegheny Plateau of Pennsylvania and New York, was field tested by International Paper (IP) foresters and the author, on sites within the region of derivation and on glaciated sites north and west of the Wisconsin drift line. Results from the field testing are presented along with the decision model as modified for both the glaciated and non-glaciated conditions.

Sawmills and planing mills (SIC code 2421) were analyzed by comparing data from the 1987 County Business Patterns, published by the U.S. Bureau of Census, and research conducted by the Ohio Cooperative Extension Service for the same year. The Ohio study and the Bureau of Census survey were comparable in industry sector definition, data collection unit and survey instrument. The Ohio research included all known sawmills and planing mills in Ohio whereas the Bureau of Census used probability sampling based on firm size with estimates made of establishments with under five employees.

Pistillate fiower survival was monitored at weekly intervals in three species of oak (Quercus rubra L., Q. velutina Lam., and Q. alba L.) during the 1989 and 1990 growing seasons in central Missouri. Pollen was shed between late April and early May in both years. However, in 1989 only Q. velutina flowers had emerged by the time of pollen shed; in 1990 flowers of all three species were receptive. Tm-tree variation was observed in morphological development of the flowers, especially in peduncle length in Q. rubra and Q. alba.

Research in the oak-hickory forest of northcentral Pennsylvania is being conducted to detect anomalies in forest condition that may be due to atmospheric deposition, with the intent that such anomalies will be further studied to determine the role, if any, of atmospheric deposition. This paper presents the status of research along a 160-km gradient of sulfate/nitrate deposition across northern Pennsylvania begun in 1986 by a multidisciplinary group of researchers at Penn State University and Ohio State University.

The impact of small mammals on regeneration of northern red oak (Quercus rubra) was studied from October 1989 to December 1990 in Huntingdon County, Pennsylvania.

Nonindustrial private landowners, who hold a majority of the Nation's commercial forests, own land primarily for reasons other than timber production. The multiple objective and dynamic nature of private ownership make planning and estimation of timber availability from this sector extremely difficult. Insight into the determinants of timber supply from private forests is provided through development of both theoretical and empirical models of harvest behavior. Tobit and probit models were used to analyze cross-sectional, and pooled time-series and cross-sectional data, respectively.