4 6 



FORKST VALUATION 



Much of the trouble, particularly from fire, can be averted by 

 proper protection and much can be done by prompt and frequent 

 thinning and underplanting of older stands on poor, sandy sites. 

 For this reason a saving in current expenses or in caring for the 

 stand may prove false economy by reducing the final cut. 



2. Thinnings. The incomes from thinnings are set down in 

 most modern yield tables for the important species and the several 

 sites and have of late been expressed as money tables. These tables 

 for thinnings are not as fully developed as the tables for the final 

 yield because of the great difference in the practice of thinnings. 

 Different practicing foresters still disagree within rather wide limits 

 in their views regarding the proper degree of thinning. In addi- 

 tion the market, income, labor, etc., may enable one forester to thin 

 early and often and compel another to postpone thinnings, and to 

 come only at long intervals. Modern practice in good intensive 

 work expects a thinning every ten years and in young stands of oak 

 on good sites five years is considered a long interval. 



Like the final cut, Yr, the thinnings vary in volume and value 

 income with species, site and practice. 



a. For a stand one hundred years old, on site I, as per Schwap- 

 pach, the sum of all thinnings taken out during the life of the stand 

 and the volume and value of the main stand one hundred years old 

 are as follows for wood of all sizes per acre : 



Arranging these values of thinnings as per cents of the volume 

 and value of the final cut gives the following interesting compari- 



son 



Thinnings expressed as per cent of main stand or final 

 cut of stand one hundred years old, site I 

 In volume 



Oak 126% 



Pine 94% 



Spruce 94% 



Beech 62% 



In value 

 67% 



57% 



22% 



45% 



