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<br />8 <br />, <br />~,,' <br /> <br />Management Situation by Revision Topic <br /> <br />~"" <br /> <br />Habitat Structural Stage Composition <br />by Selected Species <br /> <br />".PEN <br /> <br />Ie - aI.'''' <br /> <br /> <br />-10.2" <br /> <br />..-11.... <br /> <br /> <br /> <br />.j).Ut:..~I. <br /> <br />4'-J7.n~ <br /> <br /> <br />-:N.J" <br /> <br />3e-32.'" <br /> <br />4C - 11.." <br /> <br />AI s,.c.... had lell than 1" of area In structural stag. t. <br /> <br />Figure 11I-4. Habitat Structural Stage Composition by Percent <br /> <br />Habitat Structural Stagt'J Dt'J6cription <br /> <br />(1) GRASSIFORB. Stand dominance by grasses, grasslike plants, and forbs (broad-leaved herbaceous plants). <br /> <br />(2) SHRUBISEEDLlNG. Stand dominance by shrubs and/or tree seedlings up to l' Diameter at Breast Height <br />(DBH) -- 4.5 feet DBH for softwoods and 2' DBH for hardwoods. <br /> <br />(3) SAPLlNG.POLE. Stand dominance by trees in most of the 1-8.9' DBH size for softwoods and 2-8.9' DBH <br />for hardwoods. a = ()..40 percent canopy closure: b = 41-70 percent canopy closure. c = >70 percent canopy <br />closure. <br /> <br />(4) MATURE. Stand dominance by trees in most of the 9' or larger DBH size and tree age under 200 years for <br />softwoods and under 100 years for hardwoods. a = ()..40 percent canopy closure. b = 41-70 percent canopy <br />closure. c = >70 percent canopy closure. <br /> <br />(5) OLD GROWTH. The definition of old growth for the Rocky Mountain Region changed with the publication <br />of a paper by Mehl (1992). The data base still reflects the old definition: Stand dominance by trees in the 5' <br />DBH or greater size with a tree age over 200 years for softwoods and over 100 years for hardwoods. Tree- <br />crown cover is over 70 percent. For more information, see the section on old-growth forests. <br /> <br />ii' ">4"0 <br />\~' _ t.. oJ <br /> <br />11I-17 <br />