Table 1 .—Description of shelterwood units preharvest, Coram Experimental Forest, 1974 



Item 









Unit and subtreatment 









11-1 



11-2 



11-3 



11-4 



21-1 



21-2 



21-3 



21-4 



Number of trees/acre 



















Cut trees, 7+ inches 

 Leave trees, 7+ inches 



49 

 66 



39 

 51 



59 

 73 



46 

 51 



74 

 98 



71 



— 7 o 



78 



50 

 65 



64 

 89 



Subtotal 

 (Trees/ha) 



115 

 (284) 



90 

 (222) 



132 

 (326) 



97 

 (240) 



172 

 (425) 



149 

 (368) 



115 

 (284) 



153 

 (378) 



Other trees 

 5-7 inches 

 <5 inches 



85 

 1,090 



100 

 1,045 



65 

 1,215 



69 

 1,063 



155 

 1,005 



75 

 960 



115 



2,490 



145 

 2,060 



Total 

 (Trees/ha) 



1,290 

 (3 186) 



1,135 

 (3 050) 



1,412 

 (3 488) 



1,229 

 (3 036) 



1,332 

 (3 290) 



1,184 

 (2 924) 



2,720 

 (6 718) 



2,358 

 (5 824) 



Volume 



















Total standing, 3+ inches 

 cubic feet/acre 

 cubic meters/ha 



6,033 

 (422) 



3,854 

 (279) 



4,574 

 (320) 



3,835 

 (268) 



5,404 

 (378) 



2,958 

 (207) 



3,286 

 (230) 



4,232 

 (297) 



Cruised volume of 

 cut trees 

 M bd.ft./acre 



9.5 



6.0 



8.4 



5.7 



8.7 



6.9 



4.5 



5.5 



Average volume of cut 

 trees, bd.ft. 



193 



155 



142 



118 



117 



97 



89 



86 



The logging units and skyline corridors were 

 located as shown in figure 1. A running skyline 

 yarder was used for both uphill and downhill 

 yarding, and in these units the skyline spans 

 ranged between 450 and 1 ,200 ft (1 37 and 366 m) 

 (fig. 2). A live skyline yarder was used only in uphill 

 yarding on spans ranging between 500 and 800 ft 

 (152 and 244 m). 



Logging Operations 



The areas were logged during the summer of 

 1 974. Some of unit 21 was logged early when the 

 sap was still rising and the trees were particularly 

 susceptible to debarking damage. 



2 



