Treesearch

A number of basic truths are presented. The importance of carefully developing the objectives for an inventory is stressed. The use of permanent plots and temporary plots is covered. The necessity of obtaining a representative sample, training effectively, and collecting quality data is discussed. The future direction for forest inventories is suggested.

Ground surveys, remote sensing (RS), global positioning systems (GPS), geographic information systems (GIS), and permanent sampling plots (PSP) were used to inventory and monitor forests in the development of an ecosystem management plan for the island of Taiwan. While the entire island has been surveyed, this study concentrates on the Hui-Sun and Hsin-Hua Experimental Stations of Chung Hsing University and the Northeast Coast National Scenic Area. The 7,500-ha Hui-Sun Experimental Station is located in the middle part of Taiwan, the 550-ha Hsin-Hua Forest Experimental Station is in the...

Forest Health Monitoring (FHM) Program was established because of a concern that the forests in the United States were declining. The program was established to monitor the state of and changes in forest conditions across the nation. This report looks at the distributions of trees into various rating categories for three variables collected on the FHM plots from 1991 through 1997. Based on these distributions, some year to year fluctuations are seen in the samples, attributed mostly to changes in the sample composition. Future analyses will need to control these differences in sample...

Large-scale natural resource inventories generate enormous data sets. Their effective handling requires a sophisticated database management system. Such a system must be robust enough to efficiently store large amounts of data and flexible enough to allow users to manipulate a wide variety of information. In a pilot project, related to a multiresource inventory of the Suwannee River Water Management District (SRWMD) holdings in Florida, a new temporal database model will be implemented. This model is a relational one with an enhanced entity relationship between component tables. It...

Modeling the effects of increased urban tree cover on ozone concentrations (July 13-15, 1995) from Washington, DC, to central Massachusetts reveals that urban trees generally reduce ozone concentrations in cities, but tend to increase average ozone concentrations in the overall modeling domain. During the daytime, average ozone reductions in urban areas (1 ppb) were greater than the average ozone increase (0.26 ppb) for the model domain. Interactions of the effects of trees on meteorology, dry deposition, volatile organic compound (VOC) emissions, and anthropogenic emissions demonstrate...

CODIT is an acronym for compartmentalization of decay in trees. It is a simple model system originally designed to help forest managers understand the patterns of discoloration and decay in living trees.

This paper presents the results from an assessment of the application of a new molecular analytical procedure, 13C-TMAH thermochemolysis, to study the chemical modification of lignin by white-rot and brown-rot fungi. This technique differs from other molecular chemolysis procedures (e.g. TMAH thermochemolysis and CuO alkaline oxidation) as it enables one to determine the amount of hydroxylated aromatic components in degraded lignin residues through a selective lignin depolymerization and 13C-labeled methylation reaction. Major differences were observed in the chemical composition and yield...

Numerous cold-induced changes in physiology limit the capacity of northern conifers to photosynthesize during winter. Studies of red spruce (Picea rubens Sarg.) have shown that rates of field photosynthesis (Pfield) and laboratory measurements of photosynthetic capacity (Pmax) generally parallel seasonal ambient temperature trends; carbon exchange decreases in the fall, remains negative or close to zero for much of the winter, and increases in the spring. However, increases in Pfield, Pmax, and foliar carbohydrate concentrations can occur during winter thaws. Thaw-induced increases in...

The Shigometer is a battery-operated, lightweight field ohmmeter named after Dr. Alex L. Shigo. The meter was initially developed by Shigo and his collaborators as a means of detecting discolored and decayed wood in living trees using a pulsed electric current.

We examined propagule banks in six eastern hemlock (Tsuga canadensis (L.) Carriere) stands in the Catskill Mountains of New York. These stands are at risk of mortality due to the hemlock woolly adelgid (Adelges tsugae Annand), but potential effects of mortality on species composition are uncertain.