Table 5.— Percentage of live understory trees damaged by logging, by cutting unit, 



and by type of damage 



Cutting unit 



Serious stem or 

 branch damage 



Broken or 

 buried 



Cut or 

 missing 



Total 

 damaged 



No 

 damage 



■Percentage of understory trees 



Shelterwood 



11-4 



3 



15 



10 



28 



72 





21-4 



5 



17 



8 



30 



70 



Group selection 



12-4 



17 



6 



19 



42 



58 





22-4 



26 



12 



5 



43 



57 



Clearcut 



13-4 



5 



7 



25 



37 



63 





23-4 



5 



7 



33 



45 



55 



The group selection units and clearcut units 

 showed a definite and consistent pattern of dam- 

 age. The larger the trees, the greater the chance 

 that they were killed or seriously damaged (table 

 6). The percentage of trees damaged did not 



appear to be related to total number of green 

 understory trees, as stocking ranged from 540 to 

 1,280 live trees per acre (1 330 to 3 160/ha). 

 Detailed summary of damage by diameter and 

 cutting unit is shown in table 7a, b, c. 



Table 6.— Percentage of live understory trees damaged by d.b.h. class of tree 



D.b.h. class 



Cutting unit 



0-09 inches 

 (0-2.4 cm) 



1 .0-4.9 inches 

 (2.5-12.6 cm) 



5.0-6.9 inches 

 (12.7-17.6 cm) 



■Percentage of this class damaged- 



Shelterwood 



11-4 



24 



29 



40 





21-4 



20 



41 



23 



Group selection 



12-4 



20 



52 



64 





22-4 



32 



78 



82 



Clearcut 



13-4 



22 



69 



75 





23-4 



31 



85 



73 



1 1 



