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<br />Management Situation by Revision Topic <br /> <br />Table 111-4. Percent of land Area, by Age Class, within Selected Forest Species <br />(From Resource Information System data base) <br /> <br />~ <br /> <br /> PERCENT OF LAND AREA BY FOREST -COVER TYPE <br />Age Class Ponderosa Lodgepole Spruce! <br />(Years) Asoen Pine Doualas-Fir Pine Fir * <br />0-35 9 6 3 2 5 <br />36-65 8 2 1 <1 1 <br />66-95 42 5 7 6 5 <br />96-125 31 42 28 41 12 <br />126-155 9 33 31 29 ,18 <br />156-185 1 11 18 10 23 <br />186-215 0 1 7 10 17 <br />216-245 0 0 3 1 11 <br />246-275 0 0 1 1 5 <br />276-305 0 0 l' 0 2 <br />306-335 0 0 <1 0 1 <br />336-365 0 , 0 0 <br />0 <1 <br />366-395 0 0 0 0 <1 <br /> 100% 100% 100% 100% 100% <br /> * 5nrucetfir - refers to Enaelmann soruce and subalnine fir. <br /> <br />:~ <br /> <br />;:' <br /> <br />" <br /> <br />The present forest structure may be represented by habitat structural stage. Structural stage is any <br />of several developmental stages of tree stands described in terms of size class and the extent of <br />crown cover. This is similar to the successional stages a tree or collection of trees may go through -_ <br />starting as a seedling in a grasslforb stand (structural stage 1), growing into a sapling (structural <br />stage 2), then a pole (structural stage 3), a mature size tree (structural stage 4), and finally, old <br />growth (structural stage 5). The poles and mature tree stages are further divided into three canopy- <br />closure classes, identified as a, b, and c, which are 0- to 40-percent canopy closure, 41- to 70-percent <br />canopy closure, and greater than 70 percent, respectively. Figure 11I-4 shows the percent composition <br />by selected species. Figure 11I-5 shows the acres of structural stage by species. <br /> <br />O~.2429 <br /> <br />11I-16 <br />