Treesearch

Contains articles presented at the 1995 Northern Global Change Program meeting on the following topics: monitoring and predicting regional environmental change, responses of northern tree species to regional stress, responses of ecosystem processes to regional stress, forest and landscape responses to regional stress and management activities, human-forest interactions and regional change, an integrated national model of the effects of global change on U.S. Forests, and boreal forest and global change.

The chemical element content of black cherry (Prunus serotina Ehrh.) tree rings showed significant changes related to annual ammonium sulfate treatments on one watershed (Fernow WS-3) which exhibited a significant increase in streamflow N export due to treatment. However, tree-ring, soil and streamflow chemistry did not respond to the same treatment on another watershed (Clover Run WS-9). On WS-3, tree-ring concentrations of P, K, Ca, Mg, B, Zn, S and Sr were higher and concentrations of Mn, Fe, Cu and A1 were lower in wood formed either before or after treatment. Lack of response to...

Most models of forest succession and forest recovery following disturbance predict changes in nutrient availability. The purpose of this study was to compare soil and herbaceous layer plant nutrients between two young (~20 yr) and two mature (~80 yr) forest stands on Fernow Experimental Forest, Parsons, West Virginia. All sampling was carried out within 15 circular 0.04-ha sample plots per watershed, for a total of 30 plots for each age category. All vascular plants ≤1 m in height (herbaceous layer) were identified and estimated visually for cover in each of 10 circular 1-m² sub-plots. All...

Acidic deposition is an important non-point source pollutant in the Central Appalachian region that is responsible for elevated nitrogen (N) and sulfur (S) inputs to forest ecosystems. Nitrogen and calcium (Ca) budgets and plant tissue concentrations were compared for two watersheds, one that received three years of an artificial acidification treatment and an adjacent reference watershed, both located on the Fernow Experimental Forest, West Virginia Treatments consisted of ammonium sulfate fertilizer applied aerially three times per year at an annual rate of 61 kg S ha-1 and 54 kg N ha-1....

Seasonal hydrologic behavior of small forested catchments in the Appalachians was studied using oxygen-18 as a tracer. Oxygen-18 in samples of precipitation and streamflow were used to determine seasonal variations of subsurface water recharge and movement within two 30-40 ha forest catchments (Watershed 3 and 4) at the Fernow Experimental Forest in northcentral West Virginia and a 1,100-ha forested catchment in northcentral Pennsylvania for the period March 1989-March 1990. Precipitation or throughfall in both regions showed expected seasonal sine-wave variations in oxygen-18 with minima...

Spatial variation of topography, net radiation, evapotranspiration, and forest stand in the central Appalachian watershed is described. The study area is the control watershed 4 (39"20'N, 79"49"W) located in the Fernow Experimental Forest at Parsons, West Virginia. The watershed encompasses an area of 39.2 ha, it has a southeast orientation, and the average slope inclination is 14º. The forest cover is ca. 85 years old and consists of upland oak and cove hardwoods. Topographic analysis was based on data for 432 triangular segments with an average area of 360 m², covering the whole watershed...

The difficulty in regenerating oak on mesic forest sites is well known throughout the eastern and central United States, southern Ontario and Quebec, Canada. Research has shown that the establishment and development of oak seedlings prior to overstory removal, commonly referred to as advanced regeneration, is crucial for retaining oak species in the regenerated stand. The shelterwood reproduction method has been suggested as a means of developing the advance regeneration needed. In 1983, various shelterwood treatments were evaluated on the Fernow Experimental Forest in north-central West...

Dimilin was applied to two watersheds on the Fernow Experimental Forest on May 16,1992, as part of a study to evaluate its effect on non-target organisms. Data were obtained on the occurrence, conidial production, and leaf litter colonization of aquatic hyphomycetes 5 days prior to and 2, 10, 25, and 55 days following application in the two treated watersheds and two control watersheds. Two days after application, conidial numbers were higher in one treated watershed, while they remained relatively constant in the other treated watershed. Northern red oak (Quercus rubra L.) and sugar maple...

This study quantified soil nutrient status and N mineralization/nitrification potentials in soils of oakdominated, unmanaged forest stands in seven experimental forests ranging along a historical and current acidic deposition gradient from southern Illinois to central West Virginia, U.S.A. Among these seven sites (that spanned 8.5º of longitude) soil pH and Ca2+ decreased and soil organic C and extractable Al3+ increased from west to east. In general, initial soil solution NO3- total N mineralization potential and net NO3-accumulation over 30 days of incubation (as measured by aerobic...

Describes how quaking aspen (Populus tremuloides Michx.) stand recovered after logging, and logging and burning. Aspen suckering was profuse after each destructive episode but differences in stockability caused different yield trajectories.