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View
current conditions and trends in forest resources and the forest products industry.
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for forest products industries.
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data on Wisconsin's forests.
Contact information
Andy Stoltman
Forest Inventory Specialist
608-266-6941

Forest Inventory and Analysis highlights

The forests in the Midwestern states were originally inventoried one state at a time on a rotating basis. In 2000, the Forest Inventory and Analysis program switched from these periodic surveys to annual surveys. Now, 20 percent of the inventory field plots in each state are measured every year, with a full inventory taking five years to complete. When all plots have been measured once, they are revisited every five years.

Inventories were completed in 2009, 2004, 1996, 1983, 1968, 1956, 1936. Inventory highlights are available from 2012, 2004 and 1996.

Definitions

Average annual mortality
Average volume of trees that died each year due to insects, diseases and other natural causes.
Average annual net growth
Gross volume between 1996 and 2004 minus mortality over that period divided by the number of growing seasons.
Average annual removals
Average volume of trees removed from growing stock each year due to timber harvests and land use changes.
Biomass
Aboveground weight of live trees 1-inch dbh and larger. Biomass estimates are used to address issues such wildlife habitat, carbon storage, and the availability of wood fiber for fuel.
Growing stock
All commercially valuable tree species greater than 5 inches dbh.
Poletimber
Softwood trees 5-9 inches dbh; hardwood trees 5-11 inches dbh.
Sawtimber
Softwood trees greater than 9 inches dbh; hardwood trees greater than 11 inches dbh.
Seedlings-saplings
Trees less than 5 inches in diameter at breast height (dbh).
Last revised: Thursday July 02 2015