(33) 



ACCi:RL£RAT£D GROWTH OF SPRUCJC FOLLOWING 



LOGGING. 

 The purpose of this study was to determine the 

 effect of cutting on growth in volxame of spruce, 

 released from suppression. The trees from which the 

 data were gathered were situated on the lowefr slopes 

 of the hardwood type, adjoining the upper limits of 

 the spruce flat type. This are had twice been cut 

 over for softwoods, thereby releasing the trees. 

 These cuttings gave the rauaining stand almost full 

 light. The remaining softwoods were cut in 1930 

 and these trees, which had not yet been removed in 

 logging, offered the material from which the 

 required data were gathejred. 



Tables and Diagrams show the remarkable 



growth in volume due to the releasing of the spruce 

 from suppression. A comparison of average diameters 

 at the stump, at the time of release (25 years ago) 

 and the stump diameters at the present time, shows the 

 following results. 



Average diameter 35 years ago - 5.5" 



Average diameter at present- - - - - -13.3" 



Percent increase in diaaitcr 123«64^ 



The increase in volxime due to release in trees, 

 which at the age of cutting averaged 137 years equalled 



