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120 <br />100 <br />a? <br />L <br />Nl0 VD <br />? <br />? 60 <br />L <br />? <br />N 40 <br />? <br />m <br />20 <br />0 : <br />0 20 40 60 80 100 120 140 160 <br />Age <br />Figure 6. Basai area/age relationship for ponderosa pine. The keyed symbols represent <br />the average age and basal area of seedling-saplings (youngest), poles (mid-point), and <br />sawtimber (oldest), by forest. Small symbols represent inventory data used to derive the <br />line. The age and basal area of poles and sawtimber on the PSI are younger and less <br />dense than on the other forests. <br />180 <br />160 <br />140 <br />? 120 <br />c? <br />L 100 - <br />cv <br />? <br />Q 80 <br />R <br />? 60 <br />m <br />40 <br />20 <br />0 <br />y = 0.602x + 13.263 ? <br />RZ = 0.8319 -' : <br />r <br />? ? <br />\I/ . <br /> <br /> - AR <br />=??= 1? MBR <br />' X PSI <br />y = 0.8122x + 9.7091 <br />R2 = 0.9224 : . <br />.? <br />,, , • <br /> <br /> <br />' AR <br />. ? <br />, <br />?•. MBR <br />• • ? PSI <br />0 50 100 150 200 250 <br />Age <br />Figure 7. Basal area/age relationship for spruce-fir. The keyed symbols represent the <br />average age and basal area of seedling-saplings (youngest), poles (mid-point), and <br />sawtimber (oldest), by forest. Small symbols represent inventory data used to derive the <br />line. The age and basal area of poles and sawtimber on the PSI are younger and less <br />dense than on the other forests. <br />10 2/2/2007