42 CIRCULAR 791, U. S. DEPARTMENT OF AGRICULTURE 







Figure 24. — View along winter haul road in an experimental partial cutting in a 

 State-owned black spruce swamp. About 35 percent of the merchantable 

 volume was cut from this stand 6 months earlier. Koochiching County. 



removed. On others as little as 33 percent of the volume and 24 per- 

 cent of the basal area had been cut. The plots were remeasured ap- 

 proximately 5 years after cutting {21). 



The plots showed that in areas where up to about 50 percent of the 

 volume (or 40 percent of the basal area) had been removed, total mor- 



