Treesearch

Seedlings of loblolly and longleaf pine lifted in December, January, and February were treated with either benomyl or ridomil before cold storage. Along with an untreated control, they were planted after cold storage of less than 1 wk, 3 wk, and 6 wk. Survival was measured in mid-June after planting, and after 1 and 4 yr in the field. Total height was measured after 4 yr. The fungicide application increased survival of both species lifted in December or February and was beneficial to longleaf pine seedlings regardless of storage duration. Fungicide-treated longleaf pine seedlings had...

To assess solute concentration changes associated with soil compaction and organic matter removal resulting from forest harvesting, we constructed and field tested ceramic cup soil water samplers designed to withstand the forces of compaction by heavy equipment. They were installed with the cup at either the 30-or 60-cm depth; the vacuum and collection tubes rested on the soil surface during treatment. Moderate compaction consisted of a double pass across the plots with a 19 400 kg crawler tractor (60 kPa ground pressure), advancing one track width (61 cm) each pass. Severe compaction...

A thinning study in 50- to 55-year-old, even-aged, mixed species Allegheny hardwoods produced highly variable merchantable stemwood volume increment responses. Regression equations relating parameters of stand growth (ingrowth, mortality, survivor growth, net growth, and gross growth) to relative stand density had R2 values ranging from 0.07 to 0.48. When study plots with similar pretreatment species composition were assigned to four groups using cluster analysis, R2 values were increased to 0.94-0.99. There were significant differences in the relationships between relative stand density...

Forest stands with advanced symptoms of forest decline located on the Allegheny National Forest in northwestern Pennsylvania were studied to describe contemporary stand structure and composition, and the status of regeneration. Across all 340 stands, 12 percent of the total basal area per acre was in dead trees and 16 percent was in trees at high risk of mortality. For sugar maple, 59 percent of the basal area was dead or at risk. Prior to recent mortality, sugar maple was the dominant species; now it ranks third behind black cherry and red maple. Beech and red maple were the other...

This report contains information for the years 1991-93 compiled from canvass of all pulpmills that use pulpwood produced in the 14 Northeastern States. Included are data on pulpwood production and consumption from roundwood by county and on pulpwood chip production from manufacturing residues by state. Trends in pulpwood production are shown graphically.

An enrichment cloning method was evaluated for the isolation of microsatellite loci from eastern white pine and the resulting markers were examined for polymorphisms. A 200-fold enrichment was achieved for highly abundant (AC)n repeats, but for much less abundant (ACAG)n repeats an enrichment of only 20-fold was obtained. Using a single set of PCR conditions, 19 microsatellite loci were identified from 77 primer pairs evaluated. Genotyping of 16 (AC)n loci in 16 unrelated white pines from the north-central United States revealed an average of 5.4 alleles per locus and an average observed...

The Karner blue butterfly (Lycaeides melissa samuelis) is listed as a federally endangered species in the United States. It occurs in oak savanna and pine barren habitats from eastern Minnesota to New Hampshire. In 1994, we successfully reared Karner blue larvae under controlled laboratory conditions for experimental purposes, and report on those rearing methods here. We collected 20 female Karner blue adults of the spring generation from two areas in Michigan, and housed them in cages in an environmental chamber at 24?-26?C for 5 days. The female butterflies produced 154 eggs, of which 72...

A phytosociological study was conducted in a virgin northern hardwood- spruce-fir forest in the Bowl in the White Mountains of New Hampshire. There is no evidence of fire or human disturbance but hurricane winds were significant in the past. Bray and Curtis ordination was used to develop an XY vegetational mosaic. Differentiating species were Picea rubens and Acer saccharum on the X axis and Betula alleghaniensis and Fagus grandifolia on the Y axis. This ordination was divided into seven plot clusters based on size-class distributions of major tree species. Clusters represent stages in a...

Epicormic branching was monitored over a 10-year period following deferment cutting in four central Appalachian hardwood stands in West Virginia. Data from 545 codominant residual trees indicated that the average number of epicormic branches on the butt and second 16-foot log sections increased significantly for the first 2 years after treatment. For upper log sections of basswood, northern red oak, and black cherry, significant increases continued from the second to the tenth year. The net effect on quality was that 11 percent of residual trees exhibited a reduction in butt-log grade due...

Climate is a primary criterion for the development, description and validation of subregional levels of the National Hierarchical Framework of Ecological Units. However, climate information is not currently available in the form or level of detail required for integration with other biophysical factors at the section or subsection levels. In this study, historical climate data from 640 observing sites in the northeastern United States and Canada are used to delineate climatic zones with sufficient detail to be incorporated into subsection levels of the National Hierarchical Framework of...