Table 8. — Slow-gbowi.ng Species. Oak, Elm. Ash, Hickory 

 Based on 11 Plots 



To convert cubic feet to cords divide by 86. 



To convert cubic feet to board feet multiply by i.i. Since 10" 

 D. B. H. is taken as the minimum cutting diameter limit, this converting 

 factor can only be applied to those stands where the average D. B. H. is 

 greater than 10 inches. 



Table 9. — Yields for fut.ly Stocked Virgin Stands tn Illinois 



The all-aged virgin plots were separated into upland and bottomland 

 types and the data were averaged to show the average number of trees 

 supported on an acre, the D. B. H. of the average tree, height of dominant 

 trees, basal area, and cubic feet yields. (Table 9, above.) Such infor- 

 mation is based upon well-stocked virgin stands containing trees of many 

 different-aged classes. In such stands the growth and decay balance, and 

 the total yields per acre represent about the maximum for the type. The 

 even-aged stands (Table 6, p. 96) show a total growth equal to the aver- 

 age for these all-aged virgin stands for upland hardwoods at 90 years ; 

 and for slow-growing bottomland stands (Table 8, above) the total 

 content of the even-aged stands equals that of the virgin stands at about 

 80 years. 



