 Boise National Forest 's 2010 forest plan recognizes that fire and other disturbances play important roles in maintaining the character and function of ecosystems . However , previous management strategies ( as recently as the 1990 forest plan ) treated fire as an undesirable process , and the Organic Act of 1897 explicitly stated that forests were to be protected from destruction by fire . In historic conditions fires naturally occurred on the landscape ; the suppression of fires allowed dead trees to accumulate in excess of historic levels and land cover types to change , such as a shift to higher shrub and tree densities . An estimated 14 percent of the land in Boise National Forest has been affected by fires since the early 1990s , and about 10 percent of the land capable of timber production was burned so severely that land cover shifted from forest to grass and shrubland ( as of 2010 ) . 
 Boise National Forest <a href='null_genetive' title='1'><mark>'s</mark></a>2010 forest plan <a href='uninflect' title='2'><mark>recognizes</mark></a> that fire and other disturbances play important roles in maintaining the character and function of ecosystems . However , previous management strategies ( as recently as the 1990 forest plan ) treated fire as an undesirable process , and the Organic Act of 1897 explicitly stated that forests <a href='uninflect' title='3'><mark>were</mark></a> to be protected from destruction by fire . In historic conditions fires naturally occurred on the landscape ; the suppression of fires allowed dead trees to accumulate in excess of historic levels and land cover types to change , such as a shift to higher shrub and tree densities . An estimated 14 percent of the land in Boise National Forest <a href='been_done' title='4'><mark>has</mark></a> been affected by fires since the early 1990s , and about 10 percent of the land capable of timber production was burned so severely that land cover shifted from forest to grass and shrubland ( as of 2010 ) . 
Boise National Forest  2010 forest plan recognize that fire and other disturbances play important roles in maintaining the character and function of ecosystems . However , previous management strategies ( as recently as the 1990 forest plan ) treated fire as an undesirable process , and the Organic Act of 1897 explicitly stated dat forests was to be protected from destruction by fire . In historic conditions fires naturally occurred on the landscape ; the suppression of fires allowed dead trees to accumulate in excess of historic levels and land cover types to change , such as a shift to higher shrub and tree densities . An estimated 14 percent of da land in Boise National Forest done been affected by fires since the early 1990s , and bout 10 percent of the land capable of timber production was burned so severely tdatland cover shifted from forest to grass and shrubland ( as of 2010 ) .