Forest Inventory and Analysis National Program

Average Annual Net Growth of Hardwood Growing-Stock Trees per Acre of Timberland, 2002

Description

This map shows the spatial distribution of the average annual net growth of hardwood growing-stock trees per acre of timberland by county. Nationwide, the average is roughly 21 cubic feet per acre per year.


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:

Net annual growth - The average annual net increase in the volume of trees minus mortality during the period between inventories. Negative growth can be caused by phenomena such as natural disasters, fire, or insect infestations.

Growing stock trees - Live trees of commercial species which meet specified standards of quality and vigor. Trees classified as growing stock are commercial species of good form that are at least 5.0 inches diameter breast height (dbh) (4.5 feet). Trees not classified as growing stock are classified as cull trees.