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Northern Research Station
11 Campus Blvd., Suite 200
Newtown Square, PA 19073
(610) 557-4017
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Average Annual Net Growth of Softwood Growing-Stock Trees on Timberland, 2002

 

Description

This map shows the spatial distribution of the average annual net growth of softwood growing-stock trees on timberland, per county, in the area comprising the Northern Research Station. The total is roughly 1.2 billion cubic feet yearly.

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://www.fia.fs.fed.us/tools-data/

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.

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Last Modified: 03/29/2007