RESEARCH SUMMARY 



Six cutting units in Douglas-fir/larch logged to various utilization specifications with skyline yarders 

 were examined for damaged trees after logging was completed. Damage appeared to be related to the 

 total number of stems in the stand, number of marked leave trees (7.0 inches d.b.h., 18 cm) and to 

 yarding conditions such as slope. 



About 23 percent of the leave trees in two shelterwood cutting units were killed in logging. About 66 

 percent were damaged to some extent, but only about 1 percent had moderate to serious damage. In 

 treatments where loggers attempted to protect the understory trees, about 40 percent were killed or 

 seriously damaged. 



