684 



TIMBER RESOURCES FOR AMERICA'S FUTURE 



Table 94. — Percentage oj mean annunl growth at culmination attained at various ages, byjorest type group, 

 site class, and size class of products cut, Lake States Region 





Aspen- 

 paper birch 



type 

 group,' 



saw- 

 timber 







Spruce-fir t. 



^^pe group (all products) 







Age (years) 



Balsam 

 fir 



White 

 spruce 



Northern white-cedar 



Swamp black spruce- 



tamarack 





Medium 

 sites 2 



Good 

 sites 3 



Good 

 sites 



Medium 

 sites 



Poor 



sites 



20 - - 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



25 -- 



















30 





60 

 75 

 85 

 95 

 100 















35 



30 



60 



90 



100 















40 --. . 









50 



15 





45 



35 

 55 

 80 

 95 

 100 









50 





65 



85 



97 



100 



85 



93 



100 



55 



80 



94 



100 





60 .-. 



55 

 80 

 95 

 98 

 100 



15 



70 - - 







45 



80 







80 



90 











100 -- - 















100 



120 

















140 - _ _ _. 







































White-red-jack pine type group 



. Maple-beech-birch type group 





Jack pine 



Red and white pine 



Sugar 

 et 



maple. Oaks 



1 



1 



etc' Cottonwood 



Age (years) 





Unmanaged 



Managed * 



c.= 





1 





Saw- 

 timber 



Cord- 

 wood 



Saw- 

 timber 



Cord- 

 wood 



Saw- 

 timber 



Cord- 

 wood 



Saw- 

 timber 



Cord- 

 wood 



Saw- 

 timber 



Cord- 

 wood 



Saw- 

 timber 



Cord- 

 wood 



20 



Percent 



Percent 

 65 

 86 

 90 

 98 

 100 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 

 20 



25 -- 









_ _ 











45 

 70 

 85 

 94 

 96 

 97 

 100 



45' 

 75 

 95 

 99 

 100 



60 



30 







40 













80 



35 



45 

 55 









50 

 80 

 85 

 90 

 98 

 99 

 100 



35" 

 60 

 80 

 95 

 98 

 100 



95 



40 



45 



40 



80 





65 





100 



50 



60 -__ 



75 



90 



100 





65 

 85 



95 

 100 



40 

 60 



85 

 95 



---45- 

 60 

 75 

 85 

 90 

 97 

 100 





70 . -- - 







80 





98 





85 



100 









90 













100 







100 





98 

 100 











120 . --- - 













140 













































I 



' Cordwood: no deduction for age of cutting. 

 2 Medium site is 38 to 55 feet total height at 100 years. 

 ' Good site is 55 feet or over in height at 100 years. 

 * A managed stand is one that has been given skillful 

 thinnings or other immediate cuttings. 



5 Includes sugar maple, yellow birch, beech, black ash, 

 and hemlock. 



' Includes oaks, white ash, green ash, basswood, elm, 

 red maple, and black cherry. 



in 



