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FOREST HEALTH MONITORING - 1991 STATISTICAL SUMMARY
Citation:
Ritters, Droessler, Stolte, Anderson, Burkman, Stockton, Cassell, Cline, Hoffard, Shadwick, Smith, Cooter, AND Byers. FOREST HEALTH MONITORING - 1991 STATISTICAL SUMMARY. U.S. Environmental Protection Agency, Washington, D.C., EPA/620/R-94/028 (NTIS PB95136172), 1994.
Description:
This is a statistical summary of forest measurement data from the Forest Health Monitoring Network. here are now 925 plots in the FHM national network, of which 628 plots are forested. sing a probability sampling design, the installed plots are located systematically throughout the forests of twelve (12) states in the eastern United States. uring the late summer of 1991, these plots were visited by trained field crews to make selected measurements of forest health. ver 45,000 trees and seedlings of more than 100 species in ten (10) major forest types were measured. t each one-hectare forested plot location, four fixed-radius (7.32 meters) sub-plots were established. ithin these subplots, measurements were made of tree size, species, frequency, damage and crown condition. dditional measurements, such as slope and aspect, were made to characterize the forested plot locations. orest condition measurements were analyzed by using statistical procedures; results were expressed in charts, tables and cumulative distribution findings. ata summaries and maps were also prepared for three types of off-plot data: climate, forest insects and diseases, and air pollution. or these off-plot data types, selected measurements that are made by other monitoring programs were summarized in a way that will permit future analyses of the possible determinants of forest health as indicated by the FHM measurements.
