Net
Volume of Hardwood Growing Stock Trees on Timberland, 2002
Description This map shows the spatial distribution
of the nation’s hardwood growing stock trees five inches and
larger as the total volume in cubic feet by county timberland area.
Forty three percent of the volume of growing stock is hardwoods.
Use this map only to identify broad spatial trends. At the
time of
assessment, data were not available for interior Alaska,
the Pacific Basin, Puerto
Rico, U.S. Virgin Islands, and a small number of counties
in the lower 48 states.
Sources:
USDA Forest Service, 2002 RPA data, available at: http://fia.fs.fed.us/tools-data/tools/.
Distributor:
USDA Forest Service, Forest Inventory and Analysis.
Layers:
USDA Forest Service, 2002 RPA data and the National Atlas
of the United States.
Definitions:
Growing Stock is defined as a classification of timber inventory
that includes live trees of commercial species meeting specified
standards of quality or vigor. Cull trees are excluded. When associated
with volume, includes only trees 5.0 inches in diameter at breast
height (dbh) (4.5 feet) and larger. Timberland is defined as forest
land capable of producing crops of industrial wood (20 cubic feet
per acre per year in natural stands) that is not withdrawn from
timber utilization by statute or administrative regulation.
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