Forest Inventory and Analysis National Program

Volume of Softwood Rough and Rotten Cull Trees per Acre of Timberland, 2002

Description

This map shows the spatial distribution of the nation’s softwood cull volume expressed as a percentage of county timberland area.


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:

Distributor:

USDA Forest Service, Forest Inventory and Analysis.

Layers:

USDA Forest Service, 2002 RPA data and the National Atlas of the United States.

Definitions:

A Cull Tree is defined as a live tree, 5.0 inches in diameter at breast height (dbh) (4.5 feet) or larger, that is un-merchantable for saw logs now or prospectively because of rot, roughness, or species. 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land capable of producing crops of industrial wood (20 cubic feet per acre per year in natural stands) that is not withdrawn from timber utilization by statute or administrative regulation.