Figure 2.— Yarding with running skyline. 



Damage to Leave Trees 



The damage to remaining trees is summarized in 

 table 2. These are called leave trees here, al- 

 though some of the remaining trees were not 

 originally marked as leave trees. 



The type of damage on individual trees was 

 recorded in great detail and is on file at the 

 Forestry Sciences Laboratory. We categorized 

 damage according to how seriously it might affect 

 the tree: 



Group I - Marked leave trees missing, used for 

 spars, or will die. 



Group II - Stump scars 1 in 2 (64 cm 2 ) orgreater, 

 and/or heartwood damage; OR broken top 20 

 percent or more tree height; OR bole scar <5 ft 

 height (1.5 m), 100 in 2 (645 cm 2 ) or greater. 



Group III - Stump scar <10 in 2 (64 cm 2 ); OR 

 broken top <20 percent. 



Group IV-V - Light bole scars, broken branches 



No damage - No damage due to 1974 logging. 



On the average, 23 percent of the marked leave 

 trees were killed and 34 percent of all remaining 

 leave trees had no damage: 



Percentage Percentage 

 marked leave remaining 

 Unit trees killed trees undamaged 



1 1-1 



19 



32 



11-2 



24 



50 



11-3 



24 



37 



11-4 



21 



41 



21-1 



23 



28 



21-2 



26 



33 



21-3 



16 



21 



21-4 



34 



32 



Average 



23 



34 



Some of the cut trees were subsequently left to 

 replace the missing leave trees, as indicated in 

 table 2. When these are taken into account, about 

 45 percent of the trees over 7 inches d.b.h. re- 

 mained after logging. 



