MANAGEMENT PLANS THE NATIONAL FORESTS 



Table 2. — Stand, volume, and volume increment 



(Taken from F. R. Johnson's prelLniinary report of July 23, 1923, "Eflect of thinnings— Black nUls yellow 



pine") 



Average acre, cut-over lands, western vellow pine, Black Hills region. Bases, 21 plots. Total acreage 

 6.33. 



' This represents the composition and volume of the stand at the time the study was made. 

 ' 49.2 per cent volume increase. 

 • 116 per cent volume increase. 



Table 3. — Stand table 



(Derived from Table 2] 



Average acre cut-over land, we.'stern yellow pine, Black Hills, S. Dak. 

 aee, 5.33. 



Basi-, 21 plots. Total plat acre- 



Known 



D. b. h. 



Inches 



Time of 

 cutting; 



Number of 

 trees 

 8.62 

 12.04 

 12.94 

 17.81 

 16.93 

 17.00 

 14. f 2 

 12.76 

 .75 



10 years 

 uflri cut- 

 ting 



Number of 

 trees 



20 years 

 after cut- 

 ting 



Number of 

 trees 



30 years 

 after cut- 

 ling 



Predicted 



35 years 

 after cut- 

 ting 



40 years 

 after cut- 

 ting 



D. b. h. 



Number of . Number of 

 trees trees 



Number uf 



trees Inches 



8.62 

 12.94 

 12 94 

 17.44 

 16.37 

 16..% 

 14.06 



8.62 

 12.94 

 12.94 

 17.44 

 16.37 

 16.60 



8.62 

 12.94 

 1194 

 17.44 

 15.37 



4.31 

 10.78 

 12.94 

 16.19 

 16.41 



8.63 

 12.94 

 12.94 

 17.44 



Subtotal. 



1.50 

 .56 

 .94 



.10 



3.19 

 1.50 

 .56 

 .94 



10 



67.31 



10.60 



14.00 



12. 75 



10.87 



8.81 



5. 62 



3.19 



l.W) 



.56 



.94 



.10 



50.63 



16.04 



15.28 



13.40 



11.81 



9.H4 



7.21 



4.41 



Z34 



1.03 



.75 



.47 



.00 



.10 



61.04 



li37 

 10.50 

 14.00 

 12.76 

 ia87 

 8.81 

 6.62 

 3.10 

 1..V) 

 .60 

 .04 



10 



Subtotal. 

 Total 



3Z43 



> 146.85 



44.43 



142.30 



58.40 



143.30 



83.07 



143.30 



oaao 



142.30 



> This figure is larger than the rrst bemuse tioes which have since died or have been wind Ihiown ore 

 included. 



