MANAGEMENT PLANS THE NATIONAL FORESTS 



87 



Table 2. — Stand, volume, and volume increment 



iTaken from F. R. Johnson's preliminary report of July 23, 1923, "Effect of thinnings— Black Hills yeUow 



pine"] 



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

 6.33. 



At time of cutting 





10 years after cutting 



20 years after cutting i 



D.b.h. 



Trees 



Volume , 



D.b.h. 



Trees ' Volume 



D.b.h. ■ 



Trees 



Volume 



Inches 

 1 



Number 

 8.62 

 12.94 

 12.94 

 17.81 

 15.93 

 17.06 

 14.62 

 12.75 

 .75 

 10.87 

 9.18 

 5.81 

 3.38 

 1.50 

 .66 

 .94 



Board feet ' 



Inches 



Number Board feet 



Inches 



Number 



Board feet 



2 



j 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 











3 



' 



8.62 , 









4 





12.94 ! 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 



13 1 



14 i 



15 ' 

 16 

 17 

 18 



19 ; 



20 i 



8.62 

 12.94 

 12.94 

 17.44 

 15.37 

 16.50 

 14.06 

 12.75 

 10.87 

 8.81 

 5.62 

 3.19 



':S 



.94 



. 



5 



12.94 ' 





6 





17.44 





7 





15.37 





8 





16,50 





9 



'"697." 85" 

 688.50 

 581. 00 

 422. 50 

 232.50 

 106.40 

 216. 20 



14.06 





10 



11 



12 



13 



14 



12. 75 701. 25 

 10. 87 815. 25 

 8.81 881.00 

 5. 62 702. 50 

 3.19 1 494.45 

 1.50: 285.00 

 . 56 128. 80 

 .94 258. 50 



773.3 



956.2 



1,087.0 



1, 102. 5 



871,1 



15 



606.1 



16 



345.0 



17 



154.0 



18 



.19 



60.80 '■ 



300.8 





. 19 71. 25 











.19 



82.6 











Total 



145. 85 



2,905.75 





142.3 -'4,338.00 



i 



142.30 



« 6, 278. 6 







! 



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

 ' 49.2 per cent volume increase. 

 s 116 per cent volume increase. 



Table 3. — Stand talle 



[Derived from Table 2] 



Average acre cut-over land, western yellow pine. Black Hills, S. Dak. Basi'-, 21 plots. Total plat acre- 

 age, 5.33. 



D.b.h. 



Inches 



Known 



Time of 

 cutting 



Subtotal. 



Number of 

 trees 

 8.62 

 12.94 

 12.94 

 17.81 

 15.93 

 17.06 

 14,62 

 12,75 

 , 75 



113.42 



10 years | 20 years 

 aftei cut- I after cut- 

 ting ting 



Predicted 



Number of 

 trees 



8.62 

 12.94 

 12.94 

 17,44 

 15.37 

 16.50 

 14.06 



30 years 

 after cut- 

 ting 



Number of 

 trees 



Number of 

 trees 



8.62 . 



12.94 : 



12.94 ; 



17.44 I 



15.37 I 



16.50 • 



after cut- 

 ting 



after cut- 

 ting 



Number of 

 trees 



Number of 

 trees 



Inches 



8.62 

 12.94 

 12.94 

 17.44 

 15.37 



97.87 



83.81 



67.31 



10.87 

 9.18 

 5.81 

 3.38 

 1.50 

 .56 

 .94 



12.75 

 10.87 

 8.81 

 5.62 

 3.19 

 1.50 

 ,56 

 .94 



.19 



14,06 

 12.75 

 10.87 

 8.81 

 5.62 

 3.19 

 1.50 

 .56 

 .94 





.]9 



16.50 

 14.06 

 12.75 

 10.87 

 8.81 

 5.62 

 3.19 

 L50 

 .56 

 .94 



4.31 

 10.78 

 12.94 

 15.19 

 16.41 



8.62 

 12.94 

 12.94 

 17.44 



59.63 



51,94 



19 



19 



15,94 



15,28 



13,40 



11,81< 



9,84 



7,21 



4.41 



2,34 



L03 



.75 



,47 



,09 



,10 



15.37 

 16.50 

 14.06 

 12.75 

 10.87 

 8.81 

 5,62 

 3.19 

 1,50 

 .66 

 .94 



19 



Subtotal 



32.43 



44.43 , 



58.49 



74.99 



82,67 



90,36 









Total 



1 145, 85 i 



142. 30 



142. 30 



142. 30 



142.30 1 



142, 30 









1 This figure is larger than the rest because tiees which have since died or have been wind thrown are 

 included. 



