Treesearch

Dendrochemical and biochemical markers link stress in apparently healthy red spruce trees (Picea rubens) to acidic deposition. Acidic deposition to spruce forests of the northeastern USA increased sharply during the 1960s. Previous reports related visible damage of trees at high elevations to root and soil processes. In this report, dendrochemical and foliar biochemical markers indicate perturbations in biological processes in healthy red spruce trees across the northeastern USA.

A geographic information system (GIS) approach was used in conjunction with forest-plot data to develop an integrated moisture index (IMI), which was then used to predict forest productivity (site index) and species composition for forests in Ohio. In this region, typical of eastern hardwoods across the Midwest and southern Appalachians, topographic aspect and position (rather than elevation) change drastically at the fine scale and strongly influence many ecological functions. Elevational contours, soil series mapping units, and plot locations were digitized for the Vinton Furnace...

Provides current and historical information on primary and secondary hardwood products, production, prices, international trade, and employment.

Provides current and historical information on primary and secondary hardwood products, production, prices, international trade, and employment.

A statistical analytical report on mail canvass of private forest-land owners in the Southern United States. Landowner characteristics, attitudes, harvesting experience, tenure, and management planning are discussed.

A large insert genomic library from eastern white pine (Pinus strobus) was probed for the microsatellite motifs (AC)n and (AG)n, all 10 trinucleotide motifs, and 22 of the 33 possible tetranucleotide motifs. For comparison with a species from a different subgenus, a loblolly pine (Pinus taeda) genomic library was also probed with the same set of di- and tri-nucleotide repeats and 11 of the tetranucleotide repeats. The four most abundant microsatellite motifs in both species were (AC)n, (AG)n, (AAT)n, and (ATC)n, which as a group accounted for over half the microsatellite sites investigated....

We examined the effects of forest disturbance on forage availability, moose (Alces alces) seasonal forage selection, and predicted in vivo digestibility in eastern Maine. Wet-mass estimates and dry-mass conversions of species consumed by 3 tamed moose were made throughout the year (late winter, early spring, late spring, summer, fall, early winter) in bud worm (Choristoneura fumiferana) defoliated, defoliated-clearcut, defoliated-clearcut-burned, and undefoliated (control) 60- to 80-year-old spruce-fir (Picea-Abies) stands. Four treatment replicates were on sandy (deep) and 2 on silty...

The colonization of Ceratocystis fagacearum fungal mats of different ages by Ophiostoma piceae on Quercus spp. was determined in three east-central Minnesota locations during the spring of 1995. The extent of the mat area colonized by O. piceae generally increased with mat age. Subsamples per mat yielding the fungus for the three locations averaged 11 to 27% for immature mats, 65 to 72% for mature mats, and 66 to 96% for aging and declining mats. On a mat-incidence basis, frequencies of O. piceae isolation from at least one subsample of an immature mat ranged from 30 to 53% compared with...

We investigated the phenological and physiological susceptibility of the endangered Karner blue butterfly (Lycaeides melissa samuelis) to Bacillus thuringiensis var. kurstaki (Bt), a product widely used for gypsy moth (Lymantria dispar) suppression in Michigan and other infested states. We monitored phenology of the bivoltine Karner blue in two regions of Michigan from 1993 to 1995 to determine if larval stages overlapped temporally with the period of Bt application for gypsy moth suppression. Karner blue larvae of the spring generation were found during the period that Bt was applied in...

The gypsy moth, Lymantria dispar (L.), is the most serious insect defoliator of trees in the Eastern United States. It is currently established in the area northeast of a line from Michigan to Virginia, and occupies most of the Adirondack and Laurentian Mixed Forest Provinces dominated by northern hardwood, spruce and fir forests. The range of the moth continues to expand to the west and south at a rate of 10-15 miles per year and is beginning to enter the Eastern Broadleaf Forest Province dominated by oak-hickory forests. Evaluation of potential impacts from gypsy moth defoliation on...