ADVANTAGES AND DISADVANTAGES 



105 



the rotation that trees in a selection stand are completely 

 freed from shading by taller trees. Analyses of the growth of 

 individual trees show marked contrasts between those grown 

 in evenaged and unevenaged stands.^ (See Figs. 38 and 39.) 



;S20 



.9 



m 



216 



gl2 



p 



a, 



as 







20 



40 



100 



120 



140 



60 80 



Age in Years 

 Fig. 38. 



Diagrams showing the diameter growth based on age of two hemlock trees 

 of approximately the same age and size growing on the same site. Tree A 

 grew under conditions prevailing in an unevenaged stand. Tree B grew under 

 conditions prevailing in an evenaged stand. For the first 50-60 years of its 

 life tree A was overtopped. 



Much of the difference in opinion as to the relative pro- 

 duction of evenaged and unevenaged stands arises from unfair 



